This is a dynamic audio compressor which outputs a constant audio level and can be used for FM transmitters too. It uses a preamplifier with TDA 1054 produced by SGS-ATES. IC1a is a preamplifier stage ...
This dynamic compressor with passive components reduces high signal to a lower, more constant signal. If you look at this compressor schematic, you’ll notice it has no power supply, the required power ...