I thought this would be a good project to keep around to see if my digital multimeter has drifted out of calibration.
I power it from a normal bench power supply but it would probably be better if you used 2 9v batteries in series.
The LED on it displays when over 100mA is being drawn from it - basically if the LED is lit disconnect it or things will be getting very hot!
I tested it in free air with open windows over 2 hours and it was very stable so I can rely on it.
Linear Tech do a few different drop references for this IC
the 2 I've tried are the 10 volt reference and the 5 volt reference
the part numbers are
10 volt reference; LT1021BCN8-10
5 volt reference; LT1021CCN8-5
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| it stayed at 10.0006 for over 2 hours - the least significant digit moved around but that's 10's of uVolts! |
Hi Paul,
ReplyDeleteIn the schematic it's stated that tantalum is "2-10uF". What you mean with it? Is it still 10uF? Woud 10uF electrolytic capacitor work as well?
no, electrolytics are too unstable for this circuit - I just mean a tantalum capacitor value between 2uf and 10uf, I used a 10uf one
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