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.
This circuit was found in a 1967 General Electric documentation. The circuit generates signals...
Sine signals are converted into square signals by this simple circuit. The maximum frequency is...
We found this touch control on a Popular Electronics from 1970. The circuit makes use of an...