This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V and other frequencies can be generated with capacitor replacement.
This circuit is from a cookbook to timers. The circuit is triggered by an external signal and,...
This is a general purpose pramplifier launched in Brazil by Philips in the years 70. The BC549 is...
This circuit turns on your car's backlight when a vehicle coming from behind gets too close to it...