This article is about Simple Time Delay LED Circuit using Transistor where the LED lit after a short wait; also the circuit needs transistor, capacitor and few resistors for delay. In addition , the circuit is good for power light, warning light and timing project and it work with 10V DC and fits many electronics. […]
Timer Circuits
IC 555 Timer Based Mini Flasher Circuit
IC 555 Timer Based Mini Flasher Circuit makes LED blink light with a set speed, as this circuit often uses for signal, indicator and hobby projects. Also, IC 555 timer work in astable mode to give pulses all the time and if required we can change blink speed with a potentiometer, in addition the circuit […]
PWM LED Ramping Circuit (Slow Bright, Slow Fade)
PWM LED Ramping Circuit (Slow Bright, Slow Fade) make LED light go bright slowly and with not sudden ON/OFF, as this circuit is good for signal, decoration and for soft light. Also, it uses 2× IC 555, LM393, 2N7000 MOSFET for smooth change and the circuit works best with 3 to 12V power with 6V […]
Simple 555 Timer Based Animal Repeller Circuit
Simple 555 Timer Based Animal Repeller Circuit is small device to keep animals away, it make high sound which animals do not like and humans mostly do not hear it; also its main part is IC 555 timer which make high frequency sound. Sound is around 15 kHz to 120 kHz (ultrasonic), therefore, this circuit […]
Timer Based Mosquito Repeller Power Saver Circuit
Mosquito repellers are popular to keep bugs away, as they use ultrasonic sound or chemical spray; but if it is always ON then they use much electricity. To solve this problem, we designed a timer-based mosquito repeller power saver circuit, it switches the repeller ON and OFF at fixed intervals to reduce power consumption and […]
Tone Generator Doorbell Circuit using Dual IC 555 Timers
This tutorial explains a Tone Generator Doorbell Circuit using dual IC 555 timers, also the circuit is simple and works well when we press the button One IC works in astable mode and other in monostable mode and it is very important for making sound to run a 8Ω speaker. Also, the circuit needs 9V […]