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.
The presented circuit consists of a double phase shift oscillator capable of generating two sine...
The output of this circuit can be a crystal phone or a piezoelectric capsule. The circuit tests the...
To power an LED we need a closed circuit for the current flow. We also know that the LED can’t be...