This is a very simple touch sensor switch that is build with the 555 timer IC. You just need to touch the metal plate and the relay gets energised and is kept in this state for about 100 seconds, then ...

The 555 timer is one of the most versatile integrated circuits available. It can generate PWM signals, tones, and single-shot pulses. You can even put one in a bi-stable mode similar to a flip flop… ...

In this Design Ideas Classic from 1988 a 555 timer IC triggers a phase control circuit, allowing manual adjustment of power delivered to a load.

Hans Camenzind, the designer of the popular 555 timer IC died this week in Silicon Valley. He was 78. My condolences to his family and friends. Hans came to the U.S. from Switzerland in 1960. He ...

In conclusion, the popular 8-pin, bipolar NE555 timer and the low-power LM386 audio amplifier can both be used as the core of inductorless dc-dc converters.