Virtually any FET can be used on this voltmeter found in old documentation. The indicator is a microamper meter 0-100 uA and the accuracy of the circuit depends on the accuracy of the resistors used.
Found in an American 1980s documentation, this circuit generates frequencies in the range...
We found this circuit in a 1990 documentation. It draws one out of 10 numbers and during the draw...
This circuit fires a flash lamp via an external command. The pulse transformer must have a 1:10...