This circuit was found in a Hughes manual of 1068 using a MOSFET of the time. The circuit can be adapted to use modern equivalent MOSFETs.
This different configuration for a crystal galena radio or modernized since a diode is used, has a...
This circuit is from 1990 documentation. When we press D1 the lamp remains on for a time interval that...
This version of the test lights a lamp when the ring touches the tortuous wire. The SCR can be the...