We found this circuit in the July 1994 Radio Electronics magazine. The circuit uses a general-purpose transistor, and the power supply can be up to 12 V depending on the relay.
This circuit is from a Linear Technology application manual. The circuit uses the LT1022 and has...
This interesting circuit of a 1988 documentation consists of a mouse trap where the sensor is left to...
Quadrature Generator for Transistor and SCR Testing This circuit was found in US 1980s...