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In Reply to: RE: "homemade dual opamps." posted by sailor321 on December 21, 2016 at 16:38:31:
First, you need to identify single Dip opamps with offset adjust like opa 132/4 or 627. I don't find 627s nice despite the hype.
Second, you need to be confident with soldering these onto DIL 8 adaptors. It is not difficult to do.
Third, you will need 10/25 turn 100k adjustable resistors to solder onto each opamp.
It's easier if you have an opamp tester to make sure that you have done it right.
Fourth, this will only work if the dc voltage is in the low mV range as the adjustment is limited in range.
If you have large dc offsets, you will need to null this out upstream or use a dc gyrator circuit instead.
You can get DIL adaptors from Brown Dog or from China post free. The latter are good quality and cheaper.
If you are adapt at soldering, you can even 'force' the opamps to operate in Class A, or closer to it.
You need to take precautions by making sure, over days of monitoring, that there is no significant dc shift in your output.
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- RE: "homemade dual opamps." - fmak 12/21/1622:42:59 12/21/16 (0)
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