This tachometer and dwell meter for old cars was found in a 1975 documentation. The circuit is a reference for those who want to recover or maintain an old car.
Found in a 1965 Electronic Design, this circuit makes it possible to select signals with an...
This sonic relay circuit is driven by a high-pitched sound picked up by a microphone that can be a...
This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according...