We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can be a TIC106. The reset is done by a push button.
IGBTs are widely used in frequency inverters, power controllers, switched sources and DC/DC...
This 700 Hz centered high selectivity circuit was found in the 1980s Magazine Magazine for Amateur...
We obtained this circuit in a 1977 technical documentation. The basic component is an integrated...