Audio amplifier 741 (CB20478E)

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

Simple Power Supplies (CB20187E)
In the figure below we have the main configurations of power supplies with the most used...
Power Supply for HeNe LASER (CB21005E)
This circuit is a high voltage source for a gas LASER. We found it in a documentation from the...
Amplifier MFC9010 (CB20027E)
This integrated amplifier was used in televisions from the 70s, with good sensitivity...