This circuit was found in a 1964 Electronic Design. The circuit delays the firing of a load for a time given by RC. The SCR must be in accordance with the controlled load.
This simple 3-transistor circuit for short-range headphone listening was found in a Radio...
This circuit uses a transistor to trigger the alarm from a low quiescent current sensor. The relay...
This receiver using a FET appeared in a November 1957 Radio Electronics magazine. It is one of the...