Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be replaced with equivalents. MOSFET is the critical component of the circuit.
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...
Found in old American documentation, the components used are still common. The circuit directly...
This circuit was found in an Electronics World magazine from 1990. The circuit can be mounted...