Audio amplifier 741 (CB20478E)

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

CB20478E

Four-Transistor Timer (CB1261E)
The transistors of this timing circuit may be more modern types such as BC548 and BC558. The...
Tone Control Mixer (CB4918E)
The integrated circuit used in this 80's mixer is the LM301A. However the circuit can be used to...
Monostable with comparator (CB5430E)
In the figure we have the way to implement a monostable with a comparator 139, 239 or 339. The...