This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of components of the era, but modern equivalents can be used.
e find this circuit in documentation for radio amateurs of 1974. The unijunction transistor can be...
This immobilizer circuit for vehicles was found in a 80’s Hands On Electronics. The circuit...
This circuit turns off after a time that depends on C1. The circuit is from an Electronics Now...