Found in 1969 RCA documentation, this circuit maintains constant current in the filament of a lamp or in a heating element. The circuit makes use of period components.
This circuit turns on a lamp after the time set on the potentiometer. The circuit is from a Radio...
This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio...
This amplifier has a few Watt output, using old transistors. The speaker is 45 ohms, but with...