This circuit was found in a 1967 Electronics World. The circuit uses components of the time that are difficult to obtain, such as the transformer.
This circuit is from a 1998 Poptronics. The circuit triggers a buzzer after a certain time, waking...
This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The...
This circuit is the receiver for the CIR9984. It consists of a sequencer of 10 LEDs that is...