IC 555 Timer 4+

Learn and build with 555 timer circuits – your essential electronics tool.

IC 555 Timer is a comprehensive reference and toolkit for anyone working with 555 timer ICs — perfect for electronics hobbyists, students, and engineers alike.

The app features 60+ tutorials, calculators, and circuit diagrams covering the full range of 555 timer applications, including monostable, astable, bistable, and more. Whether you're a beginner exploring electronics or an experienced developer building custom circuits, this app provides everything you need in one place.

IC 555 Timer is available in 11 languages: English, French, German, Indonesian, Italian, Polish, Portuguese, Russian, Spanish, Turkish, and Ukrainian.

The app includes the following tutorials, circuit diagrams, and calculators:

• Common schematic diagrams
• Monostable mode
• Bistable mode
• Astable mode
• Schmitt trigger mode
• Connecting LEDs
• Two-way LED connection
• Laser transmitter
• Automatic Flashing Color LED
• Sound alarm
• Two-tone siren
• Passive buzzer circuit
• Active buzzer circuit
• Relay control
• Pulse width modulation (PWM)
• Generator with fixed duty cycle 50%
• Circuit with a duty cycle of less than 50%
• Electric motor speed controller
• PWM for control RGB LEDs
• Light level detector
• Light sensor-comparator
• Photo relay
• Flame sensor
• Timer with optocoupler input
• Мicrophone sound sensor circuit
• Vibration switch
• Knock sensor module
• Temperature sensors
• Mercury tilt switch
• Obstacle avoidance sensors
• Line tracking
• Tilt switch
• Hall magnetic sensor circuits
• Eliminating contact bounce
• Touch sensor circuit
• Voltage doubler
• Negative polarity voltage converter

Stay up to date with regular content updates and newly added calculators.

Note: Arduino and other mentioned names are trademarks of their respective companies. This app is independently developed and not affiliated with any of them.