This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the PNPN planar key at the time. The circuit has two supply voltages.
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...