Obtained from a 1980s Signetics documentation, this circuit uses a common integrated circuit at the time. The performance curves are given next to the diagram.
Varicap or varactor is the basic component used in this circuit of an American 80's documentation. The...
This old fashioned amplifier can source some watts to a low impedance loudspeaker. The circuit...
Using a 555 this circuit was found in old documentation, but it is still valid. | Clique na imagem...