This circuit using programmable unijunction transistors was found in General Electric documentation from 1964. LEDs can be used instead of lamps.
This voice scrambler is used to obtain effects in the 2.5 to 5 kHz range. The circuit is from...
This PWM circuit was found in an American publication from 1978. It consists of a simple control that...
This circuit is from a 1953 publication, consisting of an AM radio with 3 germanium transistors that,...