Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

Radio Spica ST-800 (CB11571E)
This circuit is for collectors. It is the circuit of one of the most popular transistor radios of the...
Interface or Shield with Comparator 2 (CB13111E)
An interesting solution that can be provided in some cases is the one shown in the figure in which...
Signal Compressor (CB24738E)
This audio circuit was found in the February 1983 issue of Radio Electronics magazine. The...