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.
The circuit, shown in the figure, consists of an audio oscillator that generates signals between...
This circuit was obtained from a 1978 Practical Wireless. It makes a speaker emit sound when there...
The circuit presented is from the Linear Databook of Motorola of 1990. With it we emulated a NOR gate...