YardBird OPA627/637 BUF634 preamp/headphone amp - diyAudio
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Old 22nd November 2005, 10:16 PM   #1
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Default YardBird OPA627/637 BUF634 preamp/headphone amp

By Request here are the pdfs for the YardBird:

First here is how the board looks.
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Old 22nd November 2005, 10:17 PM   #2
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Default Copper PDF

Here is the copper side:
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Old 22nd November 2005, 10:19 PM   #3
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Default Component PDF

Here is the component side mirrored for toner transfer:
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Old 22nd November 2005, 11:25 PM   #4
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Is there a reason to not bias the opamps into class A? It does wonders for the opa627.
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Old 23rd November 2005, 01:53 AM   #5
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The reason is that you can apply the bias to the buf634, which has an impact on the FB loop to the 627/637. No need to apply more bias, though it would be very easy to do so, simple put a resistor between the negative rail and the output of the opamp.

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