This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is powered by 12 V and the power gain is 8.9 dB.
We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can...
Suggested by Texas Instruments in 1968 documentation, this circuit uses components from the era....
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...