True RMS Voltmeter (CB25353E)

This circuit is from a Radio Electronics magazine from August 1990. The indicator module is of a common type at the time.

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3 A regulator MC78T05 (CB14535E)
The circuit shown is from the Motorola Linear Databook of 1990. It is based on the Motorola T...
AC and DC High Current Meter (CB4463E)
This is a shunt circuit to be used on a multimeter, expanding its scales to measure high currents....
High Output Voltage Amplifier (CB6179E)
This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply...