This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of analog televisions of the time. The integrated circuit used is uncommon today.
In figure 1 we have a circuit that turns on after a certain time and then turns off, also after a...
This microcircuit that fits in an aspirin box was published in Radio Electronics magazine in...
This is an amplifier that uses a pickup coil placed next to the telephone set and the listening is done in...