How about posting actual schematics of what you're trying to use?, so far there's been nothing but partial diagrams and vague partial simulation diagrams - you need to post EXACTLY what you're constructing.
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So still no schematic, the schematic was only a partial one for simulation, not a fully working design - did you add the required capacitors round the regulators, as he mentioned?.Hi Tony Stewart:
I have unbranded LM317L T092 100ma regualtor can I use that in place of LM317 To220? I like this because it fits in my bread board. And to Nigel Goodwin that was Zipzapouchs schemtic that I tryed to use not my design I hope that clears up question on this problem. Tony thanks for your comments Ralph
I hope everyone realized my design meets the minimum current load with the max 100mA CC limit and voltage regulation is not needed for no load. Also maximum thermal limit is best suited to minimum voltage with 3.6V Li ion or perhaps a 3V Li cell for 200mV full scale. https://www.electro-tech-online.com...m-meter-using-dvm-display.165639/post-1447978 This gives the necessary resolution with simplicity with no amplification, unless minimal power drain was specified.With the LM317L T092, you need a minimum of 1.5 to 2.5 mA output to maintain regulation. The advantage of the TL7805 regulator is that it can regulate down to 0mA output.
Try measuring your constant current output with your ammeter. Current should be constant even with poor clips.Hi Tony and all members:
If I measure 1 ohm then I should see 1000 m ohm on digital display. Which I do not I see 1138. Which means my error is 138 m ohm error reading for 1 ohm. I ordered kelvin clips this may help so will see when they arrive. I need trim my resistor value to exactly 12.5 ohms . Right now I have 12 ohms. Also the decimal point is not correct so I will not use it when reading milli ohm reading.
91.1 isn't 'close' to 100 - it's no where near. First job, get your constant current set correctly - EVERYTHING depends on the constant current been accurate.Hi Zipzapouch:
I measured 91.1 ma constant current rock solid. Its not 100ma but it close. What would you like me to try next? Ralph