Found in na 1969 Electronics World, this circuit makes use of transistors of the time. Equivalent transistors can be used. The diodes can be 1N4004.
We found this circuit with JFETs in a Radio Electronics magazine from June 1969. The circuit has...
Indicated for frequency measurements, this circuit can operate with inputs up to 1 MHz. We found...
This general-purpose transistor audio amplifier was found in the March 1990 issue of Radio...