| Electronics > Projects, Designs, and Technical Stuff |
| Looking for ideas to DIY uA Meter (shunt amplifier) |
| << < (5/6) > >> |
| Kleinstein:
If one really needs the high BW one would need a rather fast AZ-OPs, so maybe ADA4522 or OPA189 or MCP6V81. These have quite some bias and also a little offset, that is however at least constant. For a lower BW version one could start with something like AD8551 or MCP6V27. It also depends a lot on what to do with the result and what supply is available. |
| _Wim_:
--- Quote from: Kleinstein on December 14, 2018, 05:23:17 pm ---If one really needs the high BW one would need a rather fast AZ-OPs, so maybe ADA4522 or OPA189 or MCP6V81. --- End quote --- If the stated 100kHz bandwith is needed also in the 100x mode, you need at least a GBW of 10MHz. The OPA189 seems than the best solution of the above |
| chickenHeadKnob:
--- Quote --- What do You mean? It will be Ok to clone uCurrent? Why Dave discontinued it? --- End quote --- Dave made it open hardware, he explicitly encourages those who want to make there own to do so. |
| MiroS:
If you want to buy something that can be a good decision, they are very affordable, listed below are just exapmles , thay can be found cheaper than on below list: 1. V640: lowest range is 150 nA (so lowest will be 5/10nA) and goes up to 1A https://allegro.pl/oferta/multimetr-meratronik-v640-meratester-plomba-etui-7717926835 2. U726: lowest range is 1nA so lowest value will be ca. 20pA https://allegro.pl/oferta/przyrzad-electronic-voltmeter-u726-meratronik-7665682869 3. U722: lowest range is 1nA so lowest value will be ca. 20pA https://allegro.pl/przyrzad-woltomierz-u722a-meratronik-voltmeter-i7688063688.html Thay are very old, but usually working well , aligement is very simple, schema availbe online. Display is analog, but they have also analaog output , for every range it will be 0-1V or somethng like that. That way you can have digital output as well on every other multimeter capable measuring volts. |
| 001:
--- Quote from: MiroS on December 15, 2018, 12:23:08 pm --- - --- End quote --- Thanx But I see what burden voltage is high, isnt it? |
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