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Old 3rd January 2012, 03:32 PM   #1
beezer is offline beezer  United Kingdom
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Default rcd971 opamp

Hi, This is my first attempt ad upgrading my rcd971 rotel cd player
I bought OPA627AP and installed them but now there is no sound from the player
I've installed the opamps correctly so i'm not sure whats happened here

any suggestions?

thanks
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Old 3rd January 2012, 03:48 PM   #2
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Are you certain the original chip was a single opamp & not a dual? If the + voltage supply comes to pin 7, then it was a single & should be working. If it is on pin 8, then the stock was a dual, and you would need a Brown Dog singles-to-dual dip converter to use a pair of 627's in each spot. Personally, I think the 627 is way too unnaturally colored, and always instead use the OPA134, which happily comes in dual as OPA2134.
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Old 3rd January 2012, 04:27 PM   #3
beezer is offline beezer  United Kingdom
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the original op amps were BB opa2604

As far as I'm aware the 627's are drop in replacements but as I say I am quite a novice here
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Old 3rd January 2012, 04:35 PM   #4
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OPA2604 is a dual OPA604 so stephensank's comments apply - you can't drop in an OPA627 without the relevant adapter.
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Old 3rd January 2012, 05:21 PM   #5
beezer is offline beezer  United Kingdom
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thanks very much I'll get these brown dog adaptors

do you think I have damaged the two I installed ?
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Old 4th January 2012, 03:08 AM   #6
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Quote:
Originally Posted by beezer View Post
thanks very much I'll get these brown dog adaptors

do you think I have damaged the two I installed ?
It's unlikely that you damaged the 627's, as you did not reverse polarity, you simply applied B+ voltage to an offset trim pin.
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