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.
Found in a 1980’s documentation, this circuit must have its signal applied to an amplifier stage. The...
Found in an old English publication, this circuit applies to the 240 V network, but can be changed to...
This circuit was obtained from an old American publication. Transistors are germanium types of the...