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Sonsivri > Electronics > Hardware and Tools (Moderator: bbarney) > OMNI-AMP IIA by Omega...does anyone have a working unit?
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wanderingmoose
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« on: June 05, 2012, 06:12:39 18:12 »
This is a DC millivolt amplifier. I bought a used one dam cheap...but it does not work as prescribed. Which I guessed as the price I paid was cheap. The unit is very simple with just a one opamp circuit.
Mine has a LM725CN 8pin chip. As this is a used unit and can't get much information from Omega I am reaching out to you fine people to see if this is the opamp your unit has.
Picture of unit attached to post.
Thanks for your time.

Omni-amp IIA by Omega
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Wizpic
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« Reply #1 on: June 05, 2012, 06:49:33 18:49 »
What's the problem with it, Just had a look at them on there web site if it's just got an op-amp in it's very exspensive for what it is, the op-amp is just Instrumentation Op-Amp so should be easy to find a replacement for it
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wanderingmoose
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« Reply #2 on: June 05, 2012, 06:56:13 18:56 »
Unit not amplifying. And this version of the LM725 IC in the unit has been discontinued. There are crosses for the LM725 to say OP07, but not going down that road till I know if it is actually LM725 and not some other type of opamp.
Thanks for the reply.
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« Reply #3 on: June 06, 2012, 07:34:46 07:34 »
If it's broken you can go down any road....

Put a socket in where the opamp was (I assume it's through-hole, otherwise put a SMT adapter in) and experiment away...cost you all of $0.60 for each amp until you're happy

There's a III on eBay, FYI

http://www.ebay.com/sch/i.html?_odkw=OMNI+AMP&_osacat=0&_trksid=p2045573.m570.l1313&_nkw=OMNI-AMP&_sacat=0
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