Lm317 Milliohm Meter Schematic. The ic lm317 promises countless interesting and useful power enhancement circuits applicable in numerous fields where well dimensioned power supplies become crucially important. I placed the test probes in each end and the meter pointer was halfway between zero and 01 and measured 005 ohms.
But you can also use the lm317 in the t0 220 package if you want. The adjustable pin is connected with the two external resistor and connected with the vout pin of the ic. The capacitor c1 used for the filtering of dc input voltage and further fed to the vin pin of the lm317 voltage regulator ic.
I placed the test probes in each end and the meter pointer was halfway between zero and 01 and measured 005 ohms.
To test resistance with this milliohm meter circuit i took a 2 5cm length of solder and flattened the ends with pliers. I dunno perhaps it is the point. Because i wanted to use a bench supply or a 9v battery the voltage would fry any 3 3v logic on the board. For access to milliohmeters you either have mohm accuracy and repeatability or you do not.
