This amplifier with old germanium transistors is from a 1957 documentation. The power is a few hundred milliwatts and the transformers are common types of driver and output of the time.
In the figure we have a variation of the previous circuit with only one transistor, using the...
We found this circuit in the June 1987 issue of Radio Electronics magazine. With it, it is...
This 12 dB per octave filter was found in a 1977 digital audio publication. The circuit requires a...