This circuit is from the time when cars used contact breakers. This 80's version measures the dwell angle of the contact breaker for dwell adjustment using an era integrated circuit, the LM3917.
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...
This sequential circuit drives 6 SCRs that control incandescent lamps. Other types of lamps should...
Suggested by a Popular Electronics from the 90s, this circuit triggers an external load, relay or...