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Old 1st March 2011, 01:49 PM   #21
SSDIY is offline SSDIY  Hong Kong
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Quote:
Originally Posted by JensH View Post
You have to swap the "+" and "-" inputs of the op-amps. Right now you have a positive feedback.
Hi JensH

Thanks for your inputs but I still not sure how to swap the + and - inputs of the two op-amps therefore submitting a drawing will be highly appreciated.
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Old 1st March 2011, 11:28 PM   #22
SSDIY is offline SSDIY  Hong Kong
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Quote:
Originally Posted by qusp View Post
nvm

thought about using transformers?
Hi qusp

Transformers are out of consideration for the time being. Thanks for suggestion.
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Old 2nd March 2011, 07:25 AM   #23
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Quote:
Originally Posted by SSDIY View Post
Hi JensH

Thanks for your inputs but I still not sure how to swap the + and - inputs of the two op-amps therefore submitting a drawing will be highly appreciated.
Swap pins 2 and 3. Swap pins 5 and 6. That's all.

G
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Old 2nd March 2011, 01:47 PM   #24
SSDIY is offline SSDIY  Hong Kong
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Quote:
Originally Posted by stratus46 View Post
Swap pins 2 and 3. Swap pins 5 and 6. That's all.

G
Hi stratus

I have revised the schematic. Would you please check it for me?

Thanks
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Old 3rd March 2011, 08:38 AM   #25
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Originally Posted by SSDIY View Post
Hi stratus

I have revised the schematic. Would you please check it for me?

Thanks
Looks like you nailed it. I think the junction of R2 and R4 should be tied to ground.

G
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Old 4th March 2011, 02:03 PM   #26
SSDIY is offline SSDIY  Hong Kong
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Quote:
Originally Posted by stratus46 View Post
Looks like you nailed it. I think the junction of R2 and R4 should be tied to ground.

G
Hi stratus

You mean something like this:
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Old 4th March 2011, 03:35 PM   #27
AndrewT is offline AndrewT  Scotland
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No.
The two resistor junction should be connected direct to Signal Ground (Signal Return) in the top left.
The Signal current has to pass into the amplifier and has to pass back out. The current must go around a circuit, back to the origin.
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Old 4th March 2011, 04:23 PM   #28
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I also suspect that the "SGND" in the lower right hand corner will be mis-wired to the output connector.
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Old 4th March 2011, 11:08 PM   #29
SSDIY is offline SSDIY  Hong Kong
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Hi Andrew & Kevin

Thanks for the comments.
What do you think about this revision:
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Old 6th March 2011, 12:37 AM   #30
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As long as you DO NOT connect the "SGND" to the output XLR's pin #1, that part is OK.
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