This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from the era. Observe the input and output voltage.
The circuit shown can drive loads from 500 mA to 2 A, depending on the transistor with the TTL or...
This circuit is suitable for low impedance m icrophones. Gain is given by the 2M2 resistor. This...
This old receiver (1967) uses germanium transistors from the time and coupling transformers,...