I have tried to make a unit using the suggested 10k potentiometer and also the suggested Radio Shack multimeter.
Here’s my problem. I can’t get the multimeter to read any reduction in voltage when I run the circuit through the potentiometer. When I select the lowest amperage setting, I get no reading.
There are three lugs on the potentiometer, I used the outer-most two and wired it in series.
Can anybody help?