This circuit was found in the September 1989 issue of Radio Electronics magazine. The circuit uses components that support modern equivalents such as the operational amplifier.
Closing and opening S1 for a moment to charge the capacitor, the transistor conducts the load. The...
The basic component of this circuit is a general-purpose SCR. The voltage is according to the...
This simple preamplifier was published in Radio Electronics magazine in February 1958. The battery...