text: i am wanting a milli volt generator but i do not have the electrical prints to dos? the generator is to simulate a k type thermocouple 20 to 50 milli volts max cheap and simple solution: use a good 1.5volt battery, connect a 2.7kohm 1%  fixed resistor, and a linear 100 ohm potentiometer in series across the battery.  between the center tap and the "bottom" end of the potentiometer, you will get 0 .... 53 milli volt. use a knob and scale, and a milli volt meter to calibrate it.