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Author Topic: 'uCurrent' circa 1976  (Read 1061 times)

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Offline srruhl3701Topic starter

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'uCurrent' circa 1976
« on: August 13, 2020, 09:13:46 pm »
While browsing old electronics magazines, I came across a construction project of a miliamp volt meter accessory. It uses a CMOS op amp, and also can measure current with 1 nA full scale on the 1 volt range of the meter.

It is designed for analog meters with 1k Ohms/Volt or greater.

https://archive.org/details/197607PopularElectronics/page/n3/mode/2up
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Offline SilverSolder

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Re: 'uCurrent' circa 1976
« Reply #1 on: August 13, 2020, 10:03:55 pm »

I guess it would need a zeroing pot, if it is not based on a chopper amp?
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Offline joeqsmith

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Re: 'uCurrent' circa 1976
« Reply #2 on: August 14, 2020, 01:30:53 am »
Are you referring to the "millivolter" that allows a volt meter to read millivolts?
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Offline srruhl3701Topic starter

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Re: 'uCurrent' circa 1976
« Reply #3 on: August 14, 2020, 02:01:58 am »
Yes, it also has selectable shunts to use for reading amps.
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