This General Electric circuit is from the 80's. The PUTs used in this meter are not common components today.
This voltmeter has an input resistance of 200 M ohms (47 M ohms resistors can be used in series to...
ON Semiconductor MC74VHX1Gx Logic ICs The Mouser Electronics series 74 Logic ICs are available for...
To operate with high input voltages using a 3-terminal voltage regulator such as the LM340-15, we...