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 integrated circuit can be replaced by more modern operational amplifiers like the 741. The...
This circuit is intended for calls to the deaf and is indicated in an old English documentation. LEDs can be...
This circuit was found in an old American documentation. The integrated circuit used is uncommon...