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Old 12th December 2008, 08:44 AM   #101
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cviller, i did not manage to put my order in the wiki .

could you please count me in for 2channels and 2xpsu (despite I guess that i can use the aleph J psu).

tnx a lot!

stefan
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Old 12th December 2008, 04:57 PM   #102
cviller is offline cviller  Denmark
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Default PSU board - any suggestions?

Here is revision 01 of the psu for this group buy. The board measures 8x18 cm and will be made using a double layered process with 70um copper (just as the F5 boards)

These boards make it possible to use the same components as first watt uses for their psus. I have made the boards long and thin to make them more suitable for mono blocks, where you seldom have that much width to play around with.

I am open for suggestions - I hope we'll converge to a great design.
Attached Files
File Type: pdf psu-crc_rev01.pdf (64.6 KB, 444 views)
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Old 12th December 2008, 05:07 PM   #103
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Default Good

Nice Looking Work
and Thank you for doing this.
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Phil
Santa Fe
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Old 12th December 2008, 05:50 PM   #104
cviller is offline cviller  Denmark
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Default Got a question about components for the PSU

The layout I have made here is for the standard firstwatt style psu. So you'll need:

Onboard:
8 x snap in caps (at least 25V and 15mF more is better)
8 x 0.47 ohm 3W resistors
2 x 2.2k 3W resistors (for discharging caps)

Off board / somewhere else:
2 diode bridges mounted somewhere on the chassis
1 toroid 2x18 300VA
1-2 thermistors for soft starting the toroid
switches, connectors, fuses and all that stuff

This will be enough for a stereo amp or a monoblock, but remember diy people always want to go over the top.
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Old 13th December 2008, 02:42 AM   #105
labjr is offline labjr  United States
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Any reason you didn't put the three thermistors and the .0033uf capacitor on the the PS board?
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Old 13th December 2008, 08:11 AM   #106
cviller is offline cviller  Denmark
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Quote:
Originally posted by labjr
Any reason you didn't put the three thermistors and the .0033uf capacitor on the the PS board?

I thought most people prefer to keep mains away from rails - it would cost a few more centimeters in board length.

I could also rearrange it to be almost square, then the thermistors should be easy to fit.
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Old 13th December 2008, 09:33 AM   #107
Bengali is offline Bengali  United States
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I would like 2-4 boards and perhaps psu board.

do you have an ETA and price yet or you need to reach
a certain qty?

thanks
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Old 13th December 2008, 09:54 AM   #108
cviller is offline cviller  Denmark
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Just update the wiki, or mail me if you have troubles doing that.

Regarding the price, I have mentioned that the amps boards for a stereo set will be $15 plus shipping which is $10.

I expect the price for one psu board will be $15, but that depends on agreeing on one layout for psu instead of several.

I plan on ordering the pcbs sometime during next week and when the boards arrive I'll ask for payment and start shipping. I expect to get the boards and start shipping mid/end of January.


I'm currently working on updating the layout for the amp boards, so that you can more easily fit dale resistors and I'm also doing a bit of cleanup and writing stuff on the silk screen.
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Old 13th December 2008, 03:34 PM   #109
cviller is offline cviller  Denmark
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I have updated the layout for F5. The size is now 10x5 cm and the resistors have been made longer to be able to fit dale resistors.
Attached Files
File Type: pdf f5_rev02.pdf (40.9 KB, 420 views)
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Old 13th December 2008, 04:13 PM   #110
PQatPIT is offline PQatPIT  Finland
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Just added 2 channel boards and 2 psu boards.

Please contact by email ( pq at pitstop.fi ) about payment methods, TIA!
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