The circuit is from the 1977 National Semiconductor Audio Handbook. The bass and treble control is Baxandall type. The integrated circuit used is not common today.
This circuit is from an old publication but can be implemented with modern silicon transistors such as...
This circuit is suitable for modulating small FM transmitters for eavesdropping or espionage. The...
The transistors indicated in this assembly of documentation from the 70s no longer exist. However, we...