This stereo meter-indicator was found in the August 1971 issue of Radio Electronics magazine. The transistors are known types and BC548 equivalents can be used.
This circuit was found in a 1977 radio amateur manual. Integrated circuits are operational...
In the figure we show a configuration for a crystal-controlled overtone oscillator using a...
The transistor used is a high current Darlington, but an equivalent discrete configuration can be...