We found this circuit in a 70s RCA manual. The circuit uses an LDR by directly driving a sensitive relay. Resistor R1 is 5.6 ohms and R2 is 25k. The pot is 10k of wire.
Found in an American publication from 1968, this circuit aims to keep the torque of a DC motor...
This shield can be used both to interface microcontroller circuits or TTTL. The resistor in series...
Found in Popular Electronics this circuit uses current components to control a pump in order to...