Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an amplifier. The circuit uses components that are still common today.
This circuit will trigger a buzzer with an oscillator if the ignition key is removed with the...
This immobilizer circuit for vehicles was found in a 80’s Hands On Electronics. The circuit...
This circuit was found in the February 1994 issue of Electronics Now magazine. The circuit uses 6...