This update includes the following changes and fixes: ◉ Further improvements for a next iOS Version ◉ Some bug fixes and improvements ◉ Several changes under the hood Thanks for your great support and feedback which helps to further improve this App. Please use the Contact Developer feature inside the App to contact me in case of questions or issues. Stay safe and healthy! Best regards, Marcus

This update fixes a few minor remaining issues before the next larger update. You all keep safe and healthy! Thanks for you help! All the best, Marcus

This update includes the following changes: ■ NEW: - Further iOS 14 improvements - For the calculation Tools, it is now possible to save calculations under a name and reload them later - New Lumen Tool to calculate between Lumen and Watts - New Photo MOS Relay Tool - New Relay driver Tool for designing Relay driver circuits - New Legacy Computer Socket Section with pinouts for C64, Vic/VC20, C128 - Teensy 4.0 and 4.1 support added - Support for Arduino Uno WiFi REV 2 - Adafruit Playground Express added - A few new Op-Amps have been added - Further improvements in the ESP32 Tool - New ESP8266 Tool ■ CHANGES AND IMPROVEMENTS: There are many changes in the Make> section. This section is now more file centric and has received a new File Manager Tool. From here, you can now open all Projects, Circuits, PDFs and so on. You can copy, rename, delete, print and export files from here as well. ■ BUGFIXES: - Fixes in the Voltage Regulator and constant Current Tools - Small changes in the Active Filter calculation Tool - Fixes in Tubes Tool - In the SamacSys Component search Tool, you can now Bookmark components for later reference from the Bookmarks Tool Please: If you like my App, please write a review or, in case of problems or suggestions, please use the Support button under Settings inside the App. Thanks for your fantastic feedback which helped to continuously improve this App. Stay safe and healthy! Best regards, Marcus

This update contains several changes and improvements: ■ Additional iOS 13 compatibility - a new File and PDF Viewer has been implemented - iOS 13 page sheets are now supported - and several additional changes to support iOS 13 have been implemented - The minimal iOS Version requirement is now 10 ■ Bug fixes - Bug fixes in the C-Plate tool - Bug fix of the Components tool which could only opened once - Due to the new PDF Reader, data-sheets will now rotate correctly - Printing from inside the Database tools (e.g. Transistors) now work correctly - A bug which prevents to import Online projects was fixed (basically an iOS 13 bug) ■ SamacSys tool I found that this tool often was underestimated. It is indeed a very powerful tool to find information like specs, data sheet and pin out of literally any component. The tool is now called Comp. Search to better suit to it's purpose. I have also implemented some improvements to this tool. ■ Attenuator tool This tool now also calculates backwards based on the selected E-Series ■ Tables tool - 3D Printing Filament types added - Power over Ethernet POW Classes added ■ Circuits diagrams One of the larger improvements is the use of the internal Circuit drawing feature for the tool diagrams. This way, the circuits (e.g. for the OpAmp Tool) benefit from the following improvements: - Improved drawing quality - Resistors will now either be displayed in Zig-Zag US or IEEE Style (depending on the country setting) - Where possible, the circuits now show the calculated component values inside the diagram - All tools now offer Printing and PDF Exporting which also includes the circuit diagram ■ Circuit Editor - New Setting: "Adjust board to fit" under (File -> Board settings) allows to change the board size to fit the whole circuit so you don't have to move components around if the board is too small. - Circuits can now also be printed - It is not possible to save circuits as PDF or sent them as circuit file via Email from inside the Circuit Editor ■ Improved File Viewer, Print and export capabilities Either from inside the tools or from inside the File Viewer, content like the Tool results can now be exported as PDF as local file or printed ■ Other improvements - A new Tool SMPS for calculating Flyback Transformers for Switched Mode Power Supplies as been added - Several images have been re-created in higher quality - The Formulas tool has also been improved In case of questions, issues or suggestions, please use the Support button inside the App of the Form on the website. Thank you so much for your support. Please let others know if you like this App to keep it going. Thank you so much! Best Regards, Marcus

This is a maintenance update with a few fixes and some improvements: ■ A new Tool Regulators was added ■ Raspberry Pi 4 now supported ■ Fixed a capacitor tool bug ■ Fixed a bug which might have crashed the App in the Two-Tone Tool ■ Several changes in preparation of anything that may come up in a few month As usual, some additional minor requests have been implemented and some bugs were fixed. Thank you so much for your support. Please let others know if you like this App to keep it going. Thank you so much! Best Regards, Marcus

This update adds some new tools and improvements: ■ ESP32 The App now contains a quick reference for ESP32 Boards of Espressif including specification, datasheet access and background information. ■ Stock / Inventory The Make section now contains a new Stock / Inventory tool which can be used to maintain your local component Inventory. ■ SamacSys / ECAD Models I am very proud to announce the new ECAD Models Tool which is powered by SamacSys. SamacSys is leader in providing Schematic Symbols, PCB Footprint and 3D models for almost any available component. You can now use the ECAD Models Tool whenever you are looking for Details, including Datasheet or Pinout for any component. ■ Source Code for Projects You can now even add and edit the Source-Code files for your projects. ■ New Two-Tone Tool Even though not just dealing with plain Two Tones, this new Tool allows to generate audio codes of a variety of different standards like CTCSS, DTMF, SelCall etc. There are already 11 different Standards supported. Let me know if you need more. I am happy to add them via Data Update. ■ Other changes As usual, some additional minor requests have been implemented and some bugs were fixed. Thank you so much for your support. Please let others know if you like this App to keep it going. Thank you so much! Best Regards, Marcus

This update adds some requested features to the Circuit Drawing Tool: ■ Crystal Component ■ Raspberry Pi board ■ Arduino Uno board Even though it was previously already possible to draw a Raspberry Pi or Ardunino using the general IC component, you can now add these Boards much easier with all available Pins. In addition, for the other Tools, there are some major database updates with new and requested components and some fixes. This is now the last Update for this year. This year, there were 7 App Updates and 12 Data Updates with several improvements based on your requests. Just have a look at http://go-to.me/etb Thank you so much for your support. Please let others know if you like this App to keep it going. Thank you so much! All the best for 2019! Best Regards, Marcus

This update fixes an issue where the Online Sample Projects can not be downloaded. In addition, a few minor issues regarding iOS 12.1 and the new iPad Pro 11'' has been fixed. I am currently already working on the next version which will add some new features as well. Thank you for your great support. Best regards, Marcus

This version now allows component Synchronization of multiple Circuits in a Project. Also, Synchronization now happens automatically and seamlessly in the background. iCloud Drive support has been improved. A bug, causing duplicate file names has been fixed. The Circuit Editor now supports US Symbol Style (e.g. ZigZag Resistor) which can be enabled in the Board settings. Finally, a new universal IC Symbol allows to draw ANY possible Chip variant with any number of Pins and Pin names. This update is also a preparation of another exciting App coming soon. Thanks for your great support and fantastic reviews! Best regards, Marcus

This update contains a few minor adjustments for the new iPhone models and iOS 12. Also, as requested, the Circuit Editor now supports two different ground types (Earth and common ground). Finally, some databases were updated and a few minor bugs were fixed. Many thanks for your great support! Best regards, Marcus

This update fixes a bug where the App crashes when circuits are saved. Sorry for this bug. Changes of the previous version 11.3.1: Bug Fixes: ■ Missing Image (e.g. DB9 Female to RJ45 in Sockets -> Cable connections) fixed ■ Wrong color assignment (e.g. in Tables -> Cable Colors -> Fiber Optic Cable) fixed. ■ In Circuit Editor, using the Trashcan Icon to delete files is now working Improvements: ■ An even smaller Icon size for the tools is now available. The following tools have been redesigned: ■ Arduino ■ Raspberry Pi ■ Beagle ■ TI LounchPad The following tools have been added: ■ Colors (for Color conversion between different standards) ■ NanoPi ■ Orange Pi ■ Banana Pi ■ ODROID ■ Cubieboard ■ SparkFun These Tools now contain more than 170 Boards, including offline quick reference, online access to data-sheets and images, all with seamless integration to the Project Tool. Since this update was again a quite huge update, please let me know if me or my Alpha testers might have overseen a bug. I really appreciate your help and enthusiasm supporting me and my App. Thank you so much! Best Regards, Marcus

This Update is a new Major Release including the following changes, improvments and enhancements Bug Fixes: ■ Missing Image (e.g. DB9 Female to RJ45 in Sockets -> Cable connections) fixed ■ Wrong color assignment (e.g. in Tables -> Cable Colors -> Fiber Optic Cable) fixed. ■ In Circuit Editor, using the Trashcan Icon to delete files is now working Improvements: ■ An even smaller Icon size for the tools is now available. The following tools have been redesigned: ■ Arduino ■ Raspberry Pi ■ Beagle ■ TI LounchPad The following tools have been added: ■ Colors (for Color conversion between different standards) ■ NanoPi ■ Orange Pi ■ Banana Pi ■ ODROID ■ Cubieboard ■ SparkFun These Tools now contain more than 170 Boards, including offline quick reference, online access to data-sheets and images, all with seamless integration to the Project Tool. Since this update was again a quite huge update, please let me know if me or my Alpha testers might have overseen a bug. I really appreciate your help and enthusiasm supporting me and my App. Thank you so much! Best Regards, Marcus

This Update contains the following fixes and improvements: ■ Improved behavior in slow network conditions while checking for updates ■ Support for the new iOS 11 File Sharer for Circuit Diagrams ■ Improvements for the iPhone X ■ TIP102, LM13700 and other components added ■ New setting for even smaller Icons ■ Improved Circuit Editor ■ Corrections and additions to some component databases ■ Changes, necessary for iOS 11.3 More information can be found on my website electronic-toolbox.com. Thank you again for all your support, suggestion and positive criticism. Please let me know as soon as you can in case you may find a bug because I want to fix it. Thank you! Marcus

Version 11.10.4 is a bugfix for Version 11.10.3 with the following fixes: ■ Cross Reference Tool now working correct ■ Circuit Editor save changes bug fixed ■ Some minor UI bugs fixed Here are the changes of version 11.10.3: This Update is a new Major Release that includes many changes, improvements and enhancements: ■ Improvements: Several Tools have been improved, based on your suggestions. For instance, the db Tool can now convert values in any direction between dBm, dBW, Vrms, Vpeak, Vpp, dBV, DBmV etc.) and also displays the Formulas used for the calculation. ■ Bugfixes: A few Bugs have been fixed such as the Float bug in the Number System Tool. ■ New Tools: A new Cross Reference Tool has been added which contains a database of more than 55000 Semiconductors. This tool can be used to lookup replacement parts. ■ New Make Feature: The Majority of changes took place to the Projects section of the App. The former Projects Tool is now part or a new Make Section of the App which add the following features: - The Circuit Editor can now be started from this Page - The RS Product Browser can be used to find and even order Components or to look up details, specifications and datasheets - The Octopart Browser can also be used to lookup components and datasheets. - Components can be Bookmarked and will end up in a new Bookmark list - The new Document viewer, which is used for the two new Component Browsers but also for viewing the internal Datasheets and documents, can now be used to store documents local, inside the App by adding these Documents to your Library. The new Library Tool can then be used to view these Documents offline. - Finally, there is now an Order list Tool, requested by so many of you for a long time. You can now Create orders by either manually adding Parts to it or create an Order list automatically from any Project. An Order List can be exported, printed or conveniently be sent to RS Components so with just a few steps you can get your parts delivered the other day. ■ Rewritten Project Tool: The Projects Tool itself has also been improved: - Components, Images, Circuits, Diagrams, Notes and Links are now again separated on different Pages. This makes it easier to maintain larger Projects with many Components or Documents. - I have removed the possible number of Notes down to two. One on the Main Project Page and another Detail Note. - Notes can now contain Attributes like Bold, Italic etc. - The Components view has completely been revised. It is now easier to Jump to a corresponding Tool or to find and add Manufacturer Name and MPN using either the RS Product Browser or Octopart. Dear User, I like to thank you again for all your support, suggestion and positive criticism. I am happy to address the most received suggestions and requests with this update. For this, I had to rewrite and touch major parts of the App. Even though it has been tested by many users (thank you!), it is not unlikely that there still might be some bugs. Please let me know as soon as possible about any bug you may find because I want to fix it. I am prepared to send out another update before the App Store closes over the holidays in case this would be necessary. Otherwise I will continue working on the next update. Thanks again and to all of you celebrating Christmas, have a Merry Christmas and all the Best for 2018! Marcus

This Update is a new Major Release that includes many changes, improvements and enhancements: ■ Improvements: Several Tools have been improved, based on your suggestions. For instance, the db Tool can now convert values in any direction between dBm, dBW, Vrms, Vpeak, Vpp, dBV, DBmV etc.) and also displays the Formulas used for the calculation. ■ Bugfixes: A few Bugs have been fixed such as the Float bug in the Number System Tool. ■ New Tools: A new Cross Reference Tool has been added which contains a database of more than 55000 Semiconductors. This tool can be used to lookup replacement parts. ■ New Make Feature: The Majority of changes took place to the Projects section of the App. The former Projects Tool is now part or a new Make Section of the App which add the following features: - The Circuit Editor can now be started from this Page - The RS Product Browser can be used to find and even order Components or to look up details, specifications and datasheets - The Octopart Browser can also be used to lookup components and datasheets. - Components can be Bookmarked and will end up in a new Bookmark list - The new Document viewer, which is used for the two new Component Browsers but also for viewing the internal Datasheets and documents, can now be used to store documents local, inside the App by adding these Documents to your Library. The new Library Tool can then be used to view these Documents offline. - Finally, there is now an Order list Tool, requested by so many of you for a long time. You can now Create orders by either manually adding Parts to it or create an Order list automatically from any Project. An Order List can be exported, printed or conveniently be sent to RS Components so with just a few steps you can get your parts delivered the other day. ■ Rewritten Project Tool: The Projects Tool itself has also been improved: - Components, Images, Circuits, Diagrams, Notes and Links are now again separated on different Pages. This makes it easier to maintain larger Projects with many Components or Documents. - I have removed the possible number of Notes down to two. One on the Main Project Page and another Detail Note. - Notes can now contain Attributes like Bold, Italic etc. - The Components view has completely been revised. It is now easier to Jump to a corresponding Tool or to find and add Manufacturer Name and MPN using either the RS Product Browser or Octopart. Dear User, I like to thank you again for all your support, suggestion and positive criticism. I am happy to address the most received suggestions and requests with this update. For this, I had to rewrite and touch major parts of the App. Even though it has been tested by many users (thank you!), it is not unlikely that there still might be some bugs. Please let me know as soon as possible about any bug you may find because I want to fix it. I am prepared to send out another update before the App Store closes over the holidays in case this would be necessary. Otherwise I will continue working on the next update. Thanks again and to all of you celebrating Christmas, have a Merry Christmas and all the Best for 2018! Marcus

This update fixes a few minor issues with regards to the iPhone X. Another update with new features and tools will follow shortly.

This is mainly a maintenance update. Another feature update will follow shortly. This update contains the following changes: ■ iPhone X support ■ iOS 9.x, 10.x and 11.x support ■ New Tool: Current Divider ■ Voltage Divider improvements ■ The db Tool now displays correct Unit prefixes ■ Complex numbers will now displayed without unit prefix ■ Improved US and EU Cable length Tool ■ Transparent Keyboard bar bug fixed ■ Improved Amplifier Tool with 3500+ additional Hybrid ICs ■ Fixed bug in Projects where Octopart Browser didn't find some Components ■ Tesla Coil calculation Too now works in both directions for Inductance and number of Turns Please let me know if you may find a bug, I would like to fix it. Please let others know if you like this App to keep it going. Thank you so much! Best Regards, Marcus

This version contains the following changes and improvements: ■ Formula bug fixed ■ iOS 11 adaptions (will now run on iOS 11) ■ 3D-Viewer bug fixed ■ Sound Generator now allows to select output device ■ Projects can now be shared via Email ■ Improved integration of the Tools to the Projects ■ Added: 2-Digit SMD Codes ■ Added Tool: TI LaunchPad ■ Added Tool: Audio Amplifier (1500+ Hybrid amplifiers with circuit diagram) ■ Added Tool: Components (Identify components by Name or Picture) ■ A 'real' Manual is now available (also available online at : http://go-to.me/etb-manual) ■ New: Now you can create and draw your own Circuit Diagrams (Beta) Thanks for your fantastic support! Marcus

New Data Update January 28.2016: ■ Happy Birthday Raspberry Pi! Raspberry Pi 3 added ■ AN1431T and M Variable output shunt regulator added ■ new Arduino Pro Mini with ATmega328 added ■ TMP35,36 and 37 Low Voltage Temperature Sensor added ■ Arduino SparkFun added ■ USB Type C added ■ Several other database updates and corrections are included New Data Update December 13. 2015: A new Data Update 9.02 is available with the following changes: ■ Additional Coax Types (Belden) ■ Mini-DIN Sockets added ■ HAM Radio RIG Socket Pinouts ■ Aviation Pinouts ■ Additional data and information for the packages tool ■ The Tubes had lost their Pinout images for some reason. They are now back, sorry. Quite a few amendments and corrections for the existing databases The new App Update 9.01.01 contains the following changes: This version contains new tools, many feature improvements and of course some bug fixes. New tools: ■ Optocoupler Database – This new Database tool contains more than 400 Optocoupler types including description and pinout ■ Packages Database – This new tool contains more than 300 Package types like DIP, DIP, TO, SIP, SOT etc. The following new features have been implemented: ■ iOS 9 Electronic Toolbox and RF-Toolbox are now not only fully compatible with iOS 9 (while still backward compatible down to iOS 7), they also support new features introduced with iOS 9 such as: ■ Split view (use the App side by side with another App) ■ Multitasking (App will continue to run in Split view) ■ Improved user interface on iPhone 6 plus and 6s plus in landscape mode Additional improvements: ■ Now it is possible to directly jump to the compatible types listed inside the transistors, FETs etc. ■ You can now also directly jump to the 74xx and 40xx ICs from inside the Logic tool ■ The Battery charge tool can now also calculate discharge ■ Improved Database parametric filtering ■ Substrate Dielectric can now be selected (e.g. FRA4, GETEC, Polyimide etc.) in the PCB tools (RF-Toolbox only) ■ The voltage divider now also displays ratio between R1/R2 and V1/V2 ■ Generator, Scope and Frequency counter now allows input and output either on built in speaker / microphone or headphone plug ■ Upon request, the Frequency tool can now again convert between Period/Frequency/Wavelength ■ Tools like the Raspi tool now have “Useful links“ ■ The PV 4-20mA tool now shows sample values in 10% steps (linear and square root) Improvements in the Projects section: ■ Many additional components added ■ The component browser now allows to search for component types ■ Inside the project, you can now directly jump to the corresponding tool for a certain component. This way, you can now easily double check the pinouts, datasheets or color-code directly from inside the project tool Bug fixes: ■ The Battery plot function is now working again ■ Some corrections in the parametric filters ■ Some corrections in the calculation of the Toroid tool ■ Some general corrections in the transformer tool ■ Three ring m Ohm values are now accepted in the Resistors tool Please note, as mentioned in my blog on electronic-toolbox.com, there will soon be some additional updates. If you experience some issues or have additional requests or ideas, please let me know quickly so I can consider this for the next update. Thank you all for your great support! Please don't forget to rate this App. Thank you, Best regards, Marcus

New Data update as per August 15.: ■ Final iOS 9 adjustments ■ BeagleBone Green added ■ AWG Tool: Copper Current Carrying added ■ ICs: Some ICs added/updated ■ Tables: CTCSS / NAC Code Conversion added New Data update as per June 9. 2015: ■ 6510 CPU added ■ SJA1000 added ■ LM336Z5 (Programmable Shunt Regulator) added ■ Adjustments to the Circuit Symbols ■ Additions and corrections to the FET database ■ Arduino Nano V2.x and V3.x differences covered ■ Some Translations added/corrected New Online Projects: ■ 9V Colpitts Oscillator ■ Micro-M Solar charger ■ NE555 On-Off Switch ■ Short wave receiver The App Update 8.01.02 contains the following changes: ■ 64 Bit Support ■ iPhone 6 and 6 Plus sSupport ■ Native iCloud Drive support: - Share Projects between apps on different Devices - Share Projects between Electronic- and RF-Toolbox ■ iOS 8.x support ■ Introduction of online Projects ■ Introduction of a FAQ ■ New Tools: - New Beagle Bone Tool - New Wheatstone Bridge calculator - New Truth table / Karnaugh table / logic formula conversion tool - New Frequency counter tool - New Logic tool So there are now 77 tools in total. Tool Improvements: ■ Improved Coil calculation now with single- multi- ferrite-core, Tesla flat and straight wire ■ Introduction of scalable formulas. Formulas now look much better throughout the app and not so big anymore. ■ The sound Generator can now still run even when leaving the tool ■ The sound Generator now has a volume slider ■ A double-tap is now necessary to zoom images. No longer accidental image zooming ■ In the scope, the scale for FFT is now linear and easier to read ■ An FAQ has been introduced for common questions regarding this app. ■ Values from the Database tools such as the Transistors tool can now be added to projects and now includes all parameters as it already was for calculation tools ■ Bigger selection lists (e.g. for the color selection in the resistors tool) Project improvements: All Project maintenance screens have been improved. However, the most important changes here are the support for iCloud drive and the introduction of Online projects Corrections: ■ Now global search will work again even when in Icon mode ■ Some NTC/PTC tool corrections ■ Some corrections inside the Sockets tool Content changes: ■Tube 807 pinout added ■ Raspberry Pi Model 2 added And of course, several bigger and smaller design changes. This again a quite long list of changes and improvements. However, some of you might miss something you asked me for but that was just one more update and there are more to come over the time. As usual, I am already working on the next update. Please don't forget: As with every update, please don't forget to rate this app as all previous reviews will disappear with an update. Also, since there were many changes and even while having a quite long testing phase, there might be bugs in the app. Just let me know and I will fix it quickly. Promised! Thank you so much for your great support and suggestions. This has helped to Electronic- and RF-Toolbox to get the best app of its kind on the AppStore (that is, what some users said). Best regards, Marcus

This update fixes a few bugs that unfortunately slipped in to the last major update: ■ Device rotation will now work correctly ■ German "Zurück" button fixed ■ Few issues with 3.5" iPhones fixed (e.g. second slider in Oscilloscope) ■ Capacitor charge calculation fixed ■ Open image in other... app bug fixed ■ Duty cycle calculation in NE555 tool fixed ■ An issue that cause the app to crash when swiping back was fixed ■ White-on-white buttons in print screen was fixed Along with this, the update contains the following improvements: ■ The 4-20mA tool now also shows Hexadecimal values for SPS development ■ Calculation results can now be transferred better to projects (no longer just screenshots) ■ Some speed improvements (e.g. esp. for iPad 2) ■ Oscilloscope image can now be added to a project LIKE ALWAYS, PLEASE NOTE: Don't forget to install the new data update as well Again, many thanks for your feedback and help to improve this app further. Many many thanks also for your updated and new app reviews. Unfortunately, with every update I sent out, your previous reviews disappear. But you just need to slightly update your previous review to let it appear again. Many thanks again for this. Kind regards, Marcus

I have re-coded huge parts of the app. Basically, this release changes many things under the hood, adds many general features you have asked for, offers a completely revised and freshen up user interface and fixes many small or even a few larger bugs. Finally, it adds a new cool tool: an oscilloscope. Also, this app is now already compatible to the recently announced iOS 8. PLEASE NOTE: Don't forget to install the new data update as well Some changes to the previous version: ■ UI Improvements The user interface has been freshened up and now uses some remaining iOS 7 features such as special animations, list swiping, popover selections, the new keyboard and some more. To implement those features, I had to drop IOS 5 support but the app still supports iOS 6. However, don't worry if you don't want or can't update to iOS 6 or 7, you can still use the existing Version 6 of the app as it will still be available on the AppStore for downloading and best of all, it will still get improvements via Data updates. On the special keyboard, you can now double-tap on the X button to clear all input field of the whole screen (Thanks Hal for this suggestion). Amongst this, every single tool has been revised. They not just look and behave now more consistently. ■ Parametric search improvements When looking for a certain Transistor, FET or even Tube with certain characteristics / parameters, filters can be used. These filters have been improved in Version 7. It is now even possible to create multiple filters which can be stored and recalled at a later time. ■ iCloud and improved DropBox and iTunes support DropBox and iTunes have already been supported to import and export projects. Now, Project import and export has been improved in many ways and iCloud has been added as another option for importing and exporting. In Addition, app settings and your Organizer app customizations can also be saved and restored to and from iCloud. This way, you can save your work after rearranging all icons to your individual requirements. Moreover, you can use iCloud to transfer these settings to another i-Device if you own more than one device. This way, you can use your settings and organizer view consistently on all your devices. ■ Improved action button The action button now has a new icon and will now act as a real action button. Now, it always opens a popup menu with several options based on the current situation. ■ Grouped Tool view For those of you, who got lost in the numerous tools (now 72) the app now provides a new grouping option. By selecting this option, tools will now be grouped by the following subjects: - General Tools - Tools dealing with passive components - Tools dealing with active components - Conversion tools - Circuit tools - RF related tools You can still group and arrange tools based on your own preferences and even mix the grouped view with your own groups by using the included organizer. ■ An Oscilloscope was added Now, with this new tool, the app contains 72 tools in total. Several more are already under development. This Oscilloscope behaves almost like a real Oscilloscope but of course limited to audio signals and microphone input. ■ Bug fixes and minor improvements While working on each tool, I did also fix some bugs of course. As almost 70% of the code has been re-coded, I already apologize for any possible new bug which is not unlikely due to this amount of new code, even though I and a couple of Beta Testers have tested this release (many thanks to you at this point). As always, please let me know about any bug, ideally using the support button inside the app and I promise to fix any bug real quick. Again, many thanks for your feedback. Please don't forget to rate the app or update your review. Unfortunately, with every update I sent out, your previous reviews disappear. But you just need to slightly update your previous review to let it appear again. Many thanks for this. Kind regards, Marcus

This update includes the following changes and additions: ■ Trace-With tool This tool was moved over from the RF-Toolbox app and helps to calculate width of internal or external PCB striplines based on the IPC-2221 charts. ■ Resistor/Capacitor/Inductor combinations tool This tool helps to create a certain value by calculating various combinations of serial or parallel connected components. This is especially useful if you can't find a component with a certain value in your shack or if you need to create a value outside the E-Series standard. ■ 4-20mA conversion tool This new tool converts values based on the instrumentation systems 4-20mA DC standard. ■ support for oz/ft² (Copper Plating Weight in oz) Especially for the newly added PCB trace calculation (see below), thickness can be entered in oz/ft² . ■ calculator degree / radian support The trigonometric functions like sin() and cos() can now calculate in radians and degrees and there is a new button which can be used to switch between these two. However, the degree button ° can still be used to convert values from degree to radians, thus when set to radians and calculating sin(45°) results in the same value as if the calculation is set to degree and entering sin(45) . ■ unit tool improvements The unit tool now remembers previously selected unit types and units. ■ New Transistor tool added A new Transistor tool replaces the former BJT tool. This tool adds bias point calculations and circuit calculation of the three common Transistor circuit types. ■ New FET tool added Similar to the Transistor tool, a new tool to calculate FET bias point and basic FET circuits has been added. ■ NE555 tool improvement In the NE555 tool, it is now possible to calculate the duty cycle. ■ NTC/PTC tool improvement It is now possible to calculate in both directions. You can either enter temperature or resistance and the other value will be calculated. ■ Disable sleep mode Some users told me that they use my app in the lab all the day and leave their device on all the time to quickly perform some calculations. They asked me for the possibility to let the App prevent the device from entering the sleep mode to speed up their access to this app. For this reason, there is now a new setting under Miscellaneous. Please note that, once this setting is on, the device will no longer save battery time. Once you exit the app, everything is back to normal. You may also want to disable the splash screen along with this setting. ■ Additional Types and datasheets Included in the data update which is required for this app update, several new types and datasheets have been added. For instance about 300+ datasheets and types in the 40xxx/45xxx cmos IC section. Also, some corrections for the AVR JTAG Socket, 3N140 and 4073 are included. ■ Additional minor improvements Now, in the calculator, it is no longer necessary to hit the ANS key when entering an operator after the previous calculation has been finished. PLEASE NOTE: A new major release will also be available soon. It has already been sent to Apple and is waiting for being released. This major release contains some other user requests and improvements so please don't worry if your request is not included in this release. Many thanks for your feedback. Kind regards, Marcus

This update fixes a few issues that have been reported such as the not working "Add to project" buttons in some areas of the app and the inability to add folders in the organizer. Sorry for that. Now, in the unit conversion tool, it is now again possible to see all other conversions at a glance like in the older version. All possible conversions can now be observed by tapping on the selection below "Convert to:". Thanks for this suggestion! There is now a consistent way to decide which value should be calculated and which are the "given" values. As an example, in the Ohm's law tool, let's say you like to calculate Current and Power based on Voltage and Resistance. You can tap on the small button in front of the Current and Power fields. These buttons will then turn to have a small arrow indicating that these values will be calculated. As an alternative, it is now possible to tap at the location where you expect an input field in order to get the white input field for entering a value. You will also notice a change in the user interface. I have changed several areas throughout the whole app so that it fits better to iOS 7. There are new Icons, new fonts, less 3D buttons and headers and less rounded rectangles. I personally like it much better and hopefully you do too. Also, the News section has been completely re-coded. It is now also possible to delete news entries. Finally, I found that the review button was no longer working in the previous version and that was probably why there were just a few review updates with the last version. So now, it should again be possible to write or update reviews. Thanks again for all your ideas and support, the next version will add some new tools I am currently working on. Kind regards, Marcus

This updates adds iOS 7 compatibility as well as a lot of changes and additions: The following nine tools have been added: ■ Raspberry Pi Tool ■ Passive cooling calculator ■ PTC / NTC Temperature Resistance conversion ■ AC Ohms law tool ■ Zener diode circuit calculation ■ Constant current source tool ■ ASCII Table ■ Battery charge calculator ■ Finally, a desktop calculator So there are now 67 tools included (all for free by the way for everybody who already purchased my App before). No extra costs, no InApp Purchase. Some existing tools have been extended such as: ■ The OpAmp Tool now can also calculate an Instrumentation OpAmp circuit ■ The number system tool now also supports IEEE floating point numbers ■ The Measurements tool is now renamed to Units and has been completely revised (again) Now, it is also possible to copy output results (regardless if this is text or a number) by long-tapping the value. This way, you can copy values easier from one tool to another or even to and from the new desktop calculator or other Apps. ■ iOS 5, 6 and 7 support Electronic Toolbox is now compatible to iOS 5, 6 and 7 and it will run on all of these iOSes and all devices available from Apple, including the new iPhone 5S and 5C. However, iOS 6 or 7 is recommended in order to benefit from the additional features of the OS. Finally, as usual, many other things have been changed and corrected under the hood. ■ Icons For instance, circuit symbols can now easier be found as the symbol is already displayed at the overview level (thanks for this suggestion!) and the same now applies to other areas throughout this app. The default color scheme is now the single colored blue scheme. But don't worry if you like the colored scheme better where the tools will have different colors depending on the type of tool. Just go to settings, Appearance and switch the Icon color to 'Classic color'. Due to the additional tools, all tools have been rearranged a bit so that tools that belong together are side by side. If you have previously installed Electronic Toolbox and maybe arranged the icons by yourself, this update will not mess up your icons. Instead, the new Icons will be added at the end. So if you like to get the icons rearranged in the way I would suggest it, just go to the organizer and press the red Reset button. ■ Important Data update Please note, along with this update, also a data update has been released. Please don't forget to install the data update by using the "Check for data update" button in the settings screen of the app. The order of the installation (data update or app update) does not matter. If you find an issue, have a new idea or if you are missing something, just let me know. Please just use the Support button in my app or on the app store. I have still a lot of your ideas and requests on my to-do list and I am already working on the next update to include more of your ideas in the next update. If you like to support me, please don't forget to write or update your review as it is only valid for the current version. Thanks again for all your mails and support. Kind regards, Marcus