This vibrato circuit was found in Motorola's 1966 documentation. The circuit uses transistors of the time that can be replaced with current common types. Power is done with 3 9V batteries.
This small transmitter has an RF amplifier stage with coupling made from the central socket of the...
This filter configuration was found in an 80's documentation. The circuit has the frequency...
This powerful amplifier was part of commercial sound circuits from the 90s. The integrated circuit...