This circuit was found in a Popular Electronics documentation from the 90s. It is possible to switch the frequency of an oscillator by voltage. The circuit can act as a shield.
This circuit is from 1950, from the time when some still called the crystal triode transistor. The circuit is...
This circuit is from a 1966 American documentation. The circuit uses a photo-FET, an unusual...
We found this light relay circuit in year 2000 documentation. The relay is 6 V and the circuit...