This 1969 Mullar circuit appears elsewhere on this site. The circuit uses germanium diodes and the indicator is microammeter with zero in the center of the scale.
This circuit allows the use of the multimeter to measure the dwell meter, a feature used in the...
This circuit controls the temperature of heating elements, which may be lamps covered with...
This circuit can be powered by a voltage of only 2.5 V. Next to the diagram we have the formulas...