This circuit is the factory version of the LM386 low-power amplifier. The sound quality is excellent, and the power can be supplied with voltages from 6 to 16 V.
I found this circuit in a 1978 publication. The circuit can be assembled with a BD136 transistor to...
This sensitive 4-transistor signal follower can be used in both audio and RF circuits. P1 is a...
This is a commercial circuit from the year 1958. Transistors are germanium types and transformers...