Adjustable reference (CB21539E)

This circuit was obtained from an old American publication. The uA702 is a differential amplifier and the diode is a zener.

Ultra High Gain FET Stage (CB14146E)
The circuit shown has a voltage gain of 500 times and can use equivalent FETs like the BF245. The...
Light comparator (CB7368E)
Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using...
Proximity Relay (CB12835E)
We found this circuit in an old publication from Argentina. The relay must be of the sensitive type,...