Audio amplifier 741 (CB20478E)

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

1,2 to 1,4 V Power Supply (MSB004E)
Common diodes when forward biased present a voltage fall of about 0.6 to 0.7 V. This voltage fall...
Continuity Test (CB5005E)
This simple circuit was found in an English magazine that no longer exists, January 1970 issue. This...
Hum filter (CB13031E)
The 60 Hz hum or noise from the power grid (hum, in English) is one of the biggest enemies of...