Simple Utility Mixer Circuit Diagram

This is a Simple Utility Mixer Circuit Diagram. With it you can effectively combine signals from audio to high frequency RF. Also, as a special bonus, this circuit will provide some gain at a low noise figure. 
 

 Simple Utility Mixer Circuit Diagram

 
 
 Simple Utility Mixer Circuit Diagram
 
The inputs can be of almost any level or impedance, and the output (low-Z) will drive most tuned circuits or transistors. Basically, the device consists of two similar FET amplifier stages with a common load resistor (R2). Each FET develops a signal across this resistor, a form of cancellation occurs, and a difference signal results. If you want less gain, try reducing R2 to 2 200-. This modification will not affect the mixing ability.


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