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.
In the 70s, Ibrape launched an excellent audio pre-amplifier kit to be used in amplifiers of the...
This humidity alarm, rain or leakage was found in a 1992 publication. The sensor consists of a printed...
We found this transistorized AM receiver of the regenerative type of excellent quality in a...