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variable gain current amp

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Simon:
I don't need too much accuracy.

Vovk_Z:

--- Quote from: Simon on May 15, 2020, 12:47:28 pm --- I have found MOSFETS for over 500A that are 300µOhm. I will use 2 in parallel.

--- End quote ---
- it seems like a bit no-good design - use two 500 A mosfets to measure 0.05-5 A. What resolution do you need? Look into books like "Opamp application" etc, you definitely find strait way to measure what you need (you have to calculate an error budget).

Jay_Diddy_B:
Hi,
How are you measuring the output of the current amplifier?

How many bits do you have?

Can it work close to ground?

Jay_Diddy_B

Vovk_Z:

--- Quote from: Jay_Diddy_B on May 15, 2020, 01:24:31 pm ---Take a look at this:

--- End quote ---
:-+

Simon:

--- Quote from: Jay_Diddy_B on May 15, 2020, 05:13:16 pm ---Hi,
How are you measuring the output of the current amplifier?

How many bits do you have?

Can it work close to ground?

Jay_Diddy_B


--- End quote ---

it will go to a panel meter. I can get meters that measure 200mV, 2V, 20V. I don't need it to be highly accurate. It's more about repeatability.

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