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Old 3rd February 2004, 09:43 PM   #11
kmt is offline kmt  Germany
diyAudio Member
Join Date: Dec 2003
Location: Hamburg
Thank You for Your reply!

This is a good question; I read the datasheet of the BUF 634 and there was a schematic for a headphone amp using a pre stage. I guess they use a pre stage to implement a feedback loop, because the 634 doesn't have a negative input. As a second point, I have the possibility to adjust gain for the driver. This could be helpful because I don't know yet the signal level present at the input of the amp.


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Old 4th February 2004, 09:33 AM   #12
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Join Date: Jan 2004
Location: Solna, Stockholm, Sweden
Most applications for headphones have a gain around 5, which is hard to get with a buffer :-). My recommendation is to keep the number of stages to a minimum if you want good sound. In your case one stage is enough if you let it have a gain of 5 instead of unity. The 5532 can drive a pair of modern headphones directly.

Some speedier op's (which you can try) is not internally compensted for unity gains either. Having a gain of 5 gives you freedom. Don't solder the op, put in a holder so you can replace it and try different ones!

If you have a sufficent output from the source just go with the buffer witout any preceeding op:s.
Best regards,
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Old 4th February 2004, 10:11 AM   #13
diyAudio Member
Join Date: Jan 2004
Location: Solna, Stockholm, Sweden
Look at datasheet for BUF634 page 10.

Then try it with AD797...

Please report here ;-)
Best regards,
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