Solar receiver (CB20487E)

This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the time. The circuit is from 1991.

Hartley Audio Oscillator (CB1394E )
-- This old oscillator takes advantage of a transistor radio output transformer of the time. The 2...
Low Impedance Microphone Preamplifier III (CB963E)
The components of this circuit are exchanged for modern equivalent such as 470 K for the pot and...
10W TransistorAmplifier (CB3837E)
We find this conventional amplifier with complementary transistors in a 1987 documentation. The circuit...