This simple analog instrument circuit was found in the October 1977 issue of Radio Electronics magazine. The diodes are germanium for greater sensitivity.
This electronic roulette circuit with 10 numbers was found in a Popular Electronics from the 80s....
This circuit has a very high input impedance and a very low output impedance. We found it on a...
This circuit is from an English documentation from 1969. The circuit can be designed based on...