This is a simple tubed mixer from the 50's. The circuit does not include the power supply and has 3 inputs with independent controls. The tubes are double and the inputs are high impedance.
This circuit was found in a 1976 NASA manual, making use of components of the time. The transistor...
This Linear Technology circuit charges a battery from the energy produced by a wind generator that can...
This 10 A solid state relay was found in a 1980s documentation. It can work as a shield and...