This circuit is from an American documentation from the 90s. The transistors are of power and must be equipped with good heat sinks as well as the integrated voltage regulator.
We found this circuit in an old neon lamp application manual. The circuit stores a call. The...
This isolation circuit for audio signals was found in the August 1992 issue of Radio Electronics...
This fuzz uses only one transistor that can be the BC548. Signal input and output cables must be...