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Old 9th April 2008, 06:45 PM   #2141
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It looks OK, except that you are missing one power connection on each board (V+ and V-); they should be run parallel from PS to each board (4 wires in total plus 2 ground wires)

Also, the ground to speakers can be run directly from from OG on each board, not neccessarily from star ground which I use only for power supplies.
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Old 10th April 2008, 04:15 PM   #2142
bling is offline bling  Australia
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Thanks for your replies.
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Old 10th April 2008, 04:23 PM   #2143
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Now it's really good and that's how I do my amps.

In case of stereo amp, with a single transformer and single rectifier board, I indeed prefer to use wire between OG points on both boards and connect power grounds centrally there.
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Old 12th April 2008, 12:41 AM   #2144
wlowes is offline wlowes  Canada
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Default wire guage

Quote:
Originally posted by bling
Thanks for your replies.
The only thing I would question is the wire guage. Very small (28+) is good for the signal path. Would you agree that the star ground does well with large guage (18+)? Signal out is likely medium.
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Old 12th April 2008, 02:59 AM   #2145
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I use gauge 14-12 to connect OG on both boards, power and speaker wires are 18-20ga and signal wire is 26ga.
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Old 12th April 2008, 11:57 AM   #2146
wlowes is offline wlowes  Canada
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Default wire guage

I have only built one, so I followed your advice and benefited from your research. I used bare copper 12 on the OG (had to sand it down to get it into the pcb) 18 to the speaker (copper) and 3 strands of 30 guage pure silver on the input hard wired to your DAC. The sound is very clean and alive.
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Old 13th April 2008, 08:17 PM   #2147
johnm is offline johnm  United Kingdom
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Hi Peter.

Would you mind taking a few moments to check out the internal arrangement of my 'Budget Patek' please?

I couldn't afford Black Gates so using 4 x 100uF Elna Silmics at the chips, and 300VA 2 x 25V transformer in separate PSU enclosure, with one of your rectifier boards, and two Black Gate 1000uF / 50v caps.

I noticed in an earlier post that the speaker grounds should go to that point marked on the circuit board. Mine are currently on the copper cross bar - is this OK or would I get slightly better results using the board point instead?

Please note that the current build also contains an 4mm thick copper heatsink on the bottom of the chassis for improved heatsinking.

Many thanks.

- John
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Old 13th April 2008, 08:46 PM   #2148
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It looks good. In Patek I also mount speaker ground wire on both sides of copper crossbar, you may still trim it a bit and do it right at the board:



Click the image to open in full size.
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Old 13th April 2008, 09:28 PM   #2149
johnm is offline johnm  United Kingdom
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Thanks Peter - reason I asked is that I get a very faint hum from the speakers, though admittedly that's with my head practically INSIDE it haha!

Being a perfectionist I'd like to get rid of the hum altogether. I'm thinking perhaps I need a bit more capacitance that 2 x 1000uF on the rectifier boards. I did try just using them without the Black Gates and just the 100uF's on the amp boards but I got alot louder hum then.

I'll try 2200uF 50V Panasonic FC's and see if that helps.

- John

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Old 13th April 2008, 09:45 PM   #2150
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Do you get hum without source connected, input shunt to ground?
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