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 small power amplifier makes use of an output transformer given its design time. In fact, the...
In this circuit the output current is limited by R3. For a 300 mA current, R3 must have 12 Ω. For...
This circuit has two stable states such that at each instant only one SCR leads. The state change is...