Radio with amplifier (CB20486E)

We found this circuit in a publication of 1991. The audio amplifier is an operational that admits equivalent.

Astable MC3556 (CB14591E)
The integrated circuits used in this project are double equivalents of the well-known 555. The...
6 V x 50 mA Switching Power Supply (CB13504E)
This unit is intended for powering low consumption devices. The operating frequency is...
Treble Control (CB24006E)
These three circuits have different treble responses. We found them in the February 1970 issue of...