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Old 22nd January 2012, 04:38 AM   #1
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Default Which opamp in this preamp circuit?

I recently dusted off this ebay-bought pcb I had sitting in a cupboard for a year or so. Whilst I do have the schematic (see pic below) and recall that the circuit uses 2SK170 and 2SJ74, I don't recall what opamp it was designed for. Is anyone able to assist?
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Old 22nd January 2012, 09:54 AM   #2
AndrewT is offline AndrewT  Scotland
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Is it a single or a dual?
It needs to be unity gain stable.
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Old 22nd January 2012, 10:28 AM   #3
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If in doubt build it with an IC socket.

Then you can swap Op-Amps without compromising the PCB tracks.

Use a nice gold-plated turned socket - they're not expensive.
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Old 22nd January 2012, 11:36 AM   #4
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I would use an AD825.
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Old 22nd January 2012, 11:37 AM   #5
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Quote:
Originally Posted by AndrewT View Post
Is it a single or a dual?
It needs to be unity gain stable.
Definitely single - there is one socket per channel

How did you determine it needs to be unity gain stable?

What is a good starting point for a unity gain stable DIP single channel opamp, which runs at +/-15v?
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Old 23rd January 2012, 07:14 AM   #6
lydlaug is offline lydlaug  Norway
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Hi

It seems to be the same schematic as on this one
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And they stated to use OPA627.
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