Audio amplifier 741 (CB20478E)

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

MAX17682 DC DC Buck Converter
Maxim Integrated's MAX17682 integrated circuit is available at Mouser Electronics, a...
1-Transistor Amplifier Stage (CB961E)
This circuit has a type of bias called "virtual earth" providing good gain, given by R2. The...
Two-transistor regenerative receiver (CB20568E)
Details of the coil of this two-transistor generative receiver were not given. We found it in a...