This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital signals. The circuit can be used as a shield. FET can be a modern equivalent.
The circuit shown is a Pierce type oscillator and operates at the fundamental frequency of the...
This 100 kHz oscillator was found in a 1966 Motorola publication. The transistors are of types...
January 2017 - Texas Instruments' new TPS54200 integrated circuit for excitation of LEDs with a...