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Old 23rd July 2005, 12:39 AM   #1
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Default completed chipamp pre

Here is my latest preamp with headphone amp.

Pics to follow.
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Old 23rd July 2005, 12:40 AM   #2
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and another....
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Old 23rd July 2005, 12:42 AM   #3
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The preamp part is my FreeBird design.

It is a simple stereo opa726 circuit which looks like this...
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Old 23rd July 2005, 12:45 AM   #4
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The headphone amp part is two of my single channel YardBird design which is a opa637 and a buf634 running at 3X gain. Stability is achieved by adding a 5pf cap from opamp out to -IN.

The BUF634P is byassed with a 500R resistor which yields very good results.
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Old 23rd July 2005, 12:46 AM   #5
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Finally the PS is a simple LM7812/LM7912 regulated supply. It looks like this....
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Old 23rd July 2005, 12:47 AM   #6
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Looks good. Is this the board that you plan to offer as a group buy in the future? I am still contemplating whether I should build your design or Nuuk's JFET buffer preamp. It's a thinker I tell you.
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Old 23rd July 2005, 12:51 AM   #7
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Quote:
Originally posted by DcibeL
Looks good. Is this the board that you plan to offer as a group buy in the future? I am still contemplating whether I should build your design or Nuuk's JFET buffer preamp. It's a thinker I tell you.
Yes, i plan to produc both the YardBird and the FreeBird designs. And I can tell you they drive GCs very well.


I have tested it now with inverting/non-inverting and Mauro's Ref design.

I am quite pleased with the outcome.... but please feel free to build one yourself and be the judge.

I will send a FreeBird and a pair of YardBirds to the first Member in the US or Canada who commits to build them in the next couple of weeks to evaluate.

Cheers!
Russ
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Old 23rd July 2005, 12:52 AM   #8
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The offer is for PCBs alone of course.
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Old 23rd July 2005, 12:56 AM   #9
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I really do not want to exclude those outside of the US or Canada, so I guess if it costs me less then a couple of bucks to ship anywhere is OK.
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Old 23rd July 2005, 04:28 AM   #10
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Hello Russ! Man! you must be the top poster of the last couple of months

Nice work Russ, it must feel nice to have build it all by yourself (and not like myself wich seems to go backwards )

But one warning, to much computertime can get you to read things sdrawkcab
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