Found in an April 1977 Radio Electronics issue, this circuit uses the well-known XR2206. The C1 values for the various frequency bands are given next to the diagram.
This circuit can be used as a shield for microcontrollers. The relay is power compliant, and the...
The critical components for this 1970s project are transformers. The original transistors are made...
This amplifier is specifically designed for portable radio and recorders with a 4 ohms load....