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23rd July 2005, 12:39 AM
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#1 |
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diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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completed chipamp pre
Here is my latest preamp with headphone amp.
Pics to follow.
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Less pulp more juice Twisted Pear Audio. |
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23rd July 2005, 12:40 AM
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#2 |
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diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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and another....
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Less pulp more juice Twisted Pear Audio. |
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23rd July 2005, 12:42 AM
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#3 |
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diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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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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Less pulp more juice Twisted Pear Audio. |
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23rd July 2005, 12:45 AM
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#4 |
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diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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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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Less pulp more juice Twisted Pear Audio. |
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23rd July 2005, 12:46 AM
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#5 |
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diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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Finally the PS is a simple LM7812/LM7912 regulated supply. It looks like this....
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Less pulp more juice Twisted Pear Audio. |
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23rd July 2005, 12:47 AM
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#6 |
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diyAudio Member
Join Date: May 2003
Location: Saskatchewan
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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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The power of Science compels you! |
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23rd July 2005, 12:51 AM
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#7 | |
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diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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Quote:
  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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Less pulp more juice Twisted Pear Audio. |
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23rd July 2005, 12:52 AM
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#8 |
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diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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The offer is for PCBs alone of course.
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Less pulp more juice Twisted Pear Audio. |
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23rd July 2005, 12:56 AM
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#9 |
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diyAudio Member
Join Date: Jan 2005
Location: Nashville, TN, USA
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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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Less pulp more juice Twisted Pear Audio. |
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23rd July 2005, 04:28 AM
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#10 | |
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diyAudio Member
Join Date: Jan 2004
Location: Hudiksvall
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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 Quote:
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