This circuit provides a few watts of output and can be used in the car as an auxiliary amplifier. Transistors must be mounted on heatsinks and the speaker can be 4 ohms or 8 ohms.
This photometer is based on a Wheatstone bridge that must be balanced by the linear potentiometer P1. The...
Found in a 1980s American documentation, this circuit operates with 5 V signals requiring 55...
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...