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 conventional oscillator can generate signals from 8 to 30 MHz depending on the crystal used....
This reverb effect was found in the December 1961 Radio Electronics magazine. It makes use of...
This circuit is from a March 1967 Radio Electronics. The circuit applies to general purpose SCRs...