This circuit is intended to detect when current flows through the opening of a car door. The circuit fires the horn for 90 seconds. The FET can be the BF245 and the NPN transistors can be the BD135.
In the figure we have the way to use a shift register to divide the frequency of a signal by 9....
One of the application circuits that we gave at the beginning of this sequence was a bistable...
The maximum current of this circuit can reach 500 mA with BD136 and 1 A with TIP32. The circuit...