Found in a 1969 EEE, this circuit is based on an operational amplifier of the time and on old type MOSFETs. The components support modern equivalents.
Of course, the current is extremely small, but a voltage of 300 V can be obtained from 9 V of a...
The circuit shown is intended for cable testing, providing status indication via LEDs. The number of...
In this circuit we have the way to use two transistors as a regenerative pair simulating an SCR....