This circuit was obtained in the 1990 Motorola Linear Databook. The circuit uses a 139 series comparator, but other series can be used. The power source need not be symmetric.
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...