Found in Popular Electronics from the 90s, this circuit turns off an appliance at the end of the programmed time. The 12 V relay must have contacts according to the controlled current.
This circuit switches on an external load after a certain interval given by the capacitor. The...
This circuit is from a Poptronics, American magazine from August 2000. The circuit can be...
This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V...