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.
For readers who need high continuous voltages, a low current power supply can be built with few...
We found this circuit in the April 1993 Electronics Now magazine. Almost any general-purpose JFET...
Found in Burr Brown documentation from the 90s, this circuit applies to several operational ones....