This windshield wiper interval switch was found in the April 1990 issue of Radio Electronics magazine. The circuit uses integrated circuits that are still readily available.
This decoder TTL circuit for 15-channel remote control was found in Selezione Radio, Italian...
This is the circuit of a sensitive voltmeter using a difficult-to-obtain 5 uA full-scale...
This circuit compares two light intensities, providing the indication on an analog instrument. The...