Audio amplifier 741 (CB20478E)

This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general purpose common types.

JFET Solar Transmitter (CB19441E)
This' 90s circuit emits a signal in the FM band with a few tens of meters in range. The coil is...
540 mW Phonographic Amplifier from 1960 (CB14764E)
This circuit used germanium transistors and was powered by 6 batteries that were also used to...
Protected regulator (CB23722E)
In the figure we have a voltage regulator circuit for a source with protection. It was published in...