Broadband amplifier (CB9179E)

Found in an old Popular Electronics, this circuit has a gain of 20 dB. The integrated circuit is uncommon today.

5 W Amplifier with Muting TDA 1905 (CB15221E)
The integrated circuit used in this amplifier is not common today. The power can be between 4 and...
Timed Alarm with Lock (CB16825E)
This circuit was obtained from a 1997 publication. It is an alarm that has a lock and a bistable...
Inverter using the CA3140 and Reinforced Output (2) (CB12309E)
We found this circuit in a 1991 publication. What it does is to amplify a signal with unit gain...