This shield was found on an old EDN. The MOSFET can be of any type according to the controlled load. The power can be between 5 and 15 V typically and can be different for the MOSFET.
The oscillator in figure 1 can be used in alarm, call or warning systems, producing a sound of...
This circuit was found in a 1965 General Electric manual. It is intended for cars that have...
The component used, which is not common today, is an electronic attenuator. In this application of the...