Obtained in a 1968 Electronics World, this circuit uses transistors from the time and the sensor is a common LDR. The component values are for scales from 0.01 to 100 foot-candle.
This circuit supplies a voltage of 42 V, plus a symmetrical voltage of 12 V with 1 A. The voltage...
The operational ones used in this project are old types from National Semiconductor, since the...
This circuit is from a 1973 documentation, using germanium transistors common at the time. The...