This high sensitivity sensor was found in a 1967 General Electric SCR manual. The circuit admits equivalents by triggering a load according to the used SCR.
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...