We found this circuit in the Radio Electronics magazine of May 1977. The transformer voltage is 6 + 6 V, and the current depends on the zener diodes and is in the order of 100 to 200 mA.
The selected circuit is from the Texas Instruments optoelectronics manual. With it you can receive...
This is a 1960s amplifier setup found in a period publication. The circuit uses a special driver...
The accuracy of this circuit depends on the resistors connected to the band selection network. The...