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Old 1st July 2009, 08:34 PM   #1
Glen B is offline Glen B  United States
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Default OPA627 versus OPA2134

I have a question about substituting OPA627s in place of OPA2134s. I am thinking of trying 627s as input buffers in one of my amps versus the stock 2134s. I've found a company that supplies a pair of Burr Brown 627s mounted in an adapter that will drop in, in place of the 2134s. Attached is part of the amp schematic with the 2134s. Do I need to make any parts changes to the circuit to accommodate the 627s ?
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Old 1st July 2009, 08:45 PM   #2
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It should be fine. The 627 is probably more sensitive to PS decoupling and you will get optimum sound with some more substantial decoupling caps in addition to the 0.1uF, maybe as high as 100uF. And preferably close to the pins.
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Old 1st July 2009, 08:51 PM   #3
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By any means put an extra 100 nF MKT directly between + and - pins when using 627's ! Wima MKS2 with 5 mm pitch is just fine for this task.

Analog_sa is right about C105 and C106. They need to be replaced for bigger values preferably Panasonic FC 10 uF to 47 uF. Possibly 100 uF would not hurt either. You could parallel them to the originals but replacing them for superior stuff is the best solution.

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Old 1st July 2009, 09:09 PM   #4
Glen B is offline Glen B  United States
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Guys, great replies. Thank you. BTW, what is Panasonic "FC" ? Film cap / metallized polyester film cap ?
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Old 1st July 2009, 09:33 PM   #5
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Worth noticing is that OPA627 consumes more power than 2134, 14-15 mA vs. 8 mA
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Old 1st July 2009, 09:36 PM   #6
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Lightbulb Tried Google?

Quote:
Originally posted by Glen B
Guys, great replies. Thank you. BTW, what is Panasonic "FC" ? Film cap / metallized polyester film cap ?
If I use "panasonic" and "fc" and Google I have an answer in a few seconds and number three from the top I have got the answer, electrolytic cap
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