This circuit is from a 1968 documentation using one of the first integrated circuits available at the time, the TAA370. The circuit is powered by 1.3 V using a 200 ohm handset.
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...
Found in Popular Electronics from the 90s, this circuit can be used for high voltage applications and...
This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a...