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Old 8th December 2007, 10:26 PM   #1991
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If your source has low output impedance, 10k should work fine.

If not, 50k is not a problem either, as input shunt resistor (22k) is parallel with potentiometer and takes care of higher impedance of the pot.

I'm still using 50k pots in AMP-1 and they work very well.
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Old 9th December 2007, 12:19 AM   #1992
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Default Re: Re: magnet wire

Quote:
Originally posted by wlowes


I have experimented with magnet wire and found it worked well. I followed a design posted elsewhere. A flat cable is made with clear packing tape keeping + & - wires 1/2" apart. I used 24 gauge on the neg and 2 strands of 28 on the pos. It was simple and sounded better than anything previous. Strip the enamel with little fine sand paper.

Since then I have built cables using the same architecture but much better wire. Another big step forward. I now use pure 24 gauge silver on the neg and 3 strands of 30 gauge on the pos. 2 strands are silver and one fine gold. This cleared up distortion in the high end that comes with copper. The gold added warmth. Pretty hard to justify the cost of gold. ($10/foot) I am sure silver is almost as good at a fraction the cost. The silver wire is dirt cheap at www.myrontoback.com. Great info on cable design at http://forum.audiogon.com/cgi-bin/fr...409&read&3&4&.

For me the results are well worth it. Just finished adding Peter's USB DAC to the chip amp using these cables. Nothing could be finer.

Interesting design!
How do you make a reliable connection at the RCA(?) connector?

Can you share some of your pictures?...it will represent thousand of words.....

Thanks!

Joshua
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Old 9th December 2007, 12:39 AM   #1993
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Quote:
Originally posted by Peter Daniel
If your source has low output impedance, 10k should work fine.

If not, 50k is not a problem either, as input shunt resistor (22k) is parallel with potentiometer and takes care of higher impedance of the pot.

I'm still using 50k pots in AMP-1 and they work very well.

Peter,

What would be the best pot value to put between your USB DAC and gainclone?

Could share your knowledge, why it's better to have low impedance input amp when the driver has low output impedance?
Is it matching impedance? or is there any other reason for this particular setup?

Thanks,

Joshua
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Old 9th December 2007, 01:30 AM   #1994
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Quote:
Originally posted by joshuajoshua
What would be the best pot value to put between your USB DAC and gainclone?

Could share your knowledge, why it's better to have low impedance input amp when the driver has low output impedance?
Is it matching impedance? or is there any other reason for this particular setup?
As the DAC has pretty high output impedance, probably 50k pot would be best.

If your source has low output impedance I prefer to keep series resistance low, that's why low value pot. Also, lower input impedance will keep the DC offset low, with my amps.
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Old 9th December 2007, 02:56 AM   #1995
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Quote:
Originally posted by Peter Daniel


As the DAC has pretty high output impedance, probably 50k pot would be best.

If your source has low output impedance I prefer to keep series resistance low, that's why low value pot. Also, lower input impedance will keep the DC offset low, with my amps.

Thanks for the explanation!

Do you have a USB DAC kit available?

Joshua
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Old 9th December 2007, 02:57 AM   #1996
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Yes, USB DAC is available.
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 9th December 2007, 03:02 AM   #1997
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Quote:
Originally posted by Peter Daniel
Yes, USB DAC is available.

Ok, i follow up with email, thanks.

Joshua
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Old 10th December 2007, 03:36 PM   #1998
tangen is offline tangen  Norway
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Wink The Patek Integrated

Hi Peter,

I really admire your skills! (and envy them too).

How do you managed to bend the LM3875 chips so that no legs were broken?

Is it possible to ask for a photo of the underside of the amp so that the power cord connection is visible? Do you have photos of the power supply too?

Thank you!

Best wishes
Jan Ove Tangen
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Old 10th December 2007, 04:19 PM   #1999
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Bending the pins is not a problem, they never break.

Here's the picture of the underside:

Click the image to open in full size.

The PS as in attachment.
Attached Images
File Type: jpg ps3.jpg (97.5 KB, 1095 views)
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Old 10th December 2007, 06:22 PM   #2000
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Default patek integrated

Peter,

Can you tell me the type (stranded or solid core) and the size of the Supply and Binding post wires?

Thanks!

Joshua
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