Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using common LDRs as sensors. Transistors can be modern PNP equivalents.
This circuit was found in a 1966 American publication. The critical component is the tunnel diode. ...
This is an amplifier stage with a typical germanium transistor from the 60's to the 70's. The...
The resistors on this circuit from an American publication from the 70s are 220 ohms. The circuit...