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Old 17th January 2009, 11:17 PM   #2511
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I love how elegant your grounding solutions always are. Is the resistor necessary? Or does it just reduce noise.
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Old 17th January 2009, 11:20 PM   #2512
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It separates amp ground from chassis ground which is connected directly to Earth ground. It is not neccessary and I had amps without that resistor.
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Old 23rd January 2009, 04:10 AM   #2513
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Okay my LED isn't lighting up... Everything look okay in there to you guys??
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Old 23rd January 2009, 04:33 AM   #2514
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What value resistor did you install for R3? The diode is polarized and will light up only with long pin on +
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Old 23rd January 2009, 05:15 AM   #2515
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The Square pad on the pcb is + no?

Also, what's the source voltage? Would it be 24V because I have a 24v sec on the rectifier?

I have an 820ohm resistor on it (it's a yellow LED with a 30mA forward current and 2.1 forward v.
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Old 23rd January 2009, 05:26 AM   #2516
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Yes, the square is on V+, however, 820R is probably too small. I'm using 22k with Panasonic miniature yellow LED and 62K with the red.
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Old 23rd January 2009, 05:30 AM   #2517
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Okay... I can't find a chart with resistor values that helps me with my LED, any idea what I should be using instead?


Incidentally... I'm only getting .8v AC coming out of my traffo and 1.2ish dc of the bridge. Do I need a load attached or is something terribly the mattter.
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Old 23rd January 2009, 05:32 AM   #2518
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It looks like the fuse might be gone. I would try 20k first with a LED and then adjust for desired brightness.
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Old 23rd January 2009, 06:44 AM   #2519
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Fuse intact, swapped in a new one jic. I flipped my primaries and the bulb tester lit up so I know I was on the right primaries. I read less than a volt AC at the secondaries and just over after the bridge. Is it possible my traffo has taken a dump in-between now and when I bench tested?
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Old 3rd February 2009, 05:31 AM   #2520
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Default Pics of my DAC

Trying to upload a photo of my DAC...let's see. Okay, that worked. I wanted to say thanks to Peter for the fabulous kit. My version here worked first try (Peter soldered the surface mount components). I put the system (described in the next paragraph) together in one go so I don't have proper before-after comparisons. All i can say is that it sounds great.

The DAC is mounted on a solid piece of what started out as 8/4 cherry. My source is iTunes with lossless files feeding the DAC. The DAC supplies Pete Millett's hybrid headphone/pre amp which in turn drives a Decware Zen experimenters Tube Amp (built from kit... I can supply photos of the whole set up if anyone is curious.) Those 1.8 watts drive some vintage Klipsch Heresys.

I'll stop there. As I said, it all sounds fabulous. Life is good.

Ryan
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