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 can be applied to other 3-terminal regulators and equivalent transistors can be used....
Different delays for the rise time and fall time of the output signal when compared with the input...
September 2016 - can be purchased from Mouser Electronics the new transceivers MAX348x and MAX349x from...