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Old 30th October 2007, 08:53 AM   #271
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I need PSU PCB for 1 Stereo Set. Thanks!

-Claiborne
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Old 30th October 2007, 08:58 AM   #272
Nordic is offline Nordic  South Africa
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You need 1 PSU per transformer...
So for stereo amp with shared transformer you need one PSU board,

For monoblocks i.e. 1 transformer per channel you will need 2 PSUs for a stereo set.
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Old 30th October 2007, 11:08 AM   #273
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Quote:
Originally posted by Nordic
Greg, care to elaborate?
Hi Nordic,

I noticed you have thermals on two of the connections on the main caps but the other six are missing. It may just be the size of the picture or my bad eyes.

regards
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Old 30th October 2007, 02:28 PM   #274
Nordic is offline Nordic  South Africa
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Sorry Greg, what are themals? Does the PSU need underpants now?
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Old 30th October 2007, 08:30 PM   #275
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Sorry Nordic,

A "thermal" is an Eagle term and it maybe a universal term. The picture of "Thermals on" will make it clear.

regards
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File Type: png thermal.png (9.4 KB, 199 views)
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Old 30th October 2007, 09:36 PM   #276
Nordic is offline Nordic  South Africa
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Gotcha, what does it do?

I got the boards today, I was a little unhappy, as they only put soldermask on the bottom, and used the guillotine when the v-score machine broke (apparently it is fixed again now).

Luckily they cut the boards larger than the corner marks, so a little fileing should make em look tip top again. I am happy with the silkscreen, and the soldermask is 98% ok, probably equal to normal commercial grade. Do scrape away some mask on small pads, if you are scared you can not get the solder in.... one pad that caught my eye was on D1. Some of them are just fine though.

If you don't own flux, go buy some... it will help your soldering 500%.

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Old 30th October 2007, 11:33 PM   #277
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Hi Nordic,

Congradulations !!

Quote:
Originally posted by Nordic
Gotcha, what does it do?
When components are located on copper planes it prevents the heat from the soldering iron escaping into the large copper surface.

Quote:
Originally posted by Nordic
I got the boards today, I was a little unhappy, as they only put soldermask on the bottom, and used the guillotine when the v-score machine broke (apparently it is fixed again now).?
Soldermasks only go on the side with the traces and solder. On a single sided board that's on the bottom side of the PCB.

Quote:
Originally posted by Nordic
Luckily they cut the boards larger than the corner marks, so a little fileing should make em look tip top again. I am happy with the silkscreen, and the soldermask is 98% ok, probably equal to normal commercial grade. Do scrape away some mask on small pads, if you are scared you can not get the solder in.... one pad that caught my eye was on D1. Some of them are just fine though.
I always sand my PCB edges. I use a piece of fine sandpaper on a flat surface and sand until the colour of the edge matches the PCB surface colour.

Quote:
Originally posted by Nordic
If you don't own flux, go buy some... it will help your soldering 500%.
Do you use rosin cored solder? I've never needed extra flux on soldering PCBs. I do clean the PCB with alcohol before soldering to ensure all traces of oil are removed.

BTW: I've soldered a lot of different metals over the years with lots of different fluxes.

regards
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Old 31st October 2007, 04:21 AM   #278
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Hi Nordic,
Please, what is the max diameter for C1-C2 on your new PCB?

Thanks,
M
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Old 31st October 2007, 12:48 PM   #279
Nordic is offline Nordic  South Africa
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Measured as 23mm
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Old 31st October 2007, 02:12 PM   #280
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OK.
Thanks
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