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Old 29th January 2010, 08:02 AM   #1271
Beftus is offline Beftus  Netherlands
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Quote:
Originally Posted by Iain McNeill View Post
If those 5 empty resistors are paralleled with the one resistor shown, I'd use 6 resistors, 6X the resistance in place of that one there, if you felt it was necessary.
The resistors shown are the bleeder resistors.
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Old 29th January 2010, 09:53 AM   #1272
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Originally Posted by troystg View Post
If no one has some to send and are not making orders to include them with, you can order then, ship them to me and I can forward via Post office or FedEx...
I'll contact you privately if nobody else offers. Thanks a lot
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Old 29th January 2010, 12:12 PM   #1273
udailey is offline udailey  United States
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Beftus,
Those resistors are in series with the rails and not in parallel with anything but themselves.
Uriah
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Old 29th January 2010, 01:45 PM   #1274
Beftus is offline Beftus  Netherlands
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Some people believe R1 and R2 on BrianGT's PSU PCB are the bleeder resistors, whereas the other resistors (R3-R12) can be used to create a CCRC setup.

Last edited by Beftus; 29th January 2010 at 02:01 PM.
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Old 29th January 2010, 01:58 PM   #1275
udailey is offline udailey  United States
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Beftus
Just looked at my board and you are right. R1 and R2 are indeed bleeders while the rest are in series. Sorry about that. I would go with something like 2k2 3W for R1 and R2 while going with .47 or .33 for the other series resistors definitely 3W for those.
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Old 29th January 2010, 02:08 PM   #1276
Beftus is offline Beftus  Netherlands
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For the bleeders 2k2 3W are a good choice, the other resistors for the CCRC setup should be at least rated @ 3 Watt. I've got 4W resistors in those spots.

As for the value of those resistors, pick your preferred cut-off frequency of the filter and then calculate how much resistance you need to achieve that.
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Old 29th January 2010, 02:23 PM   #1277
troystg is offline troystg  United States
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.47 Ohm 3 W as bleeders. "Smoke 'm if you got 'm..." :-)

<edit- Would mess up the pretty PCB... :-( >
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Old 29th January 2010, 02:25 PM   #1278
udailey is offline udailey  United States
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2k2 was suggested for bleeders. .47-.33 or thereabouts depending on frequency cutoff was suggested as the series resistors.
Uriah
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Old 30th January 2010, 04:35 AM   #1279
cjkpkg is online now cjkpkg  United States
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I went with 3.3K bleeders for R1 and R2...tonight I hooked up the PSU to my xformer on the test bench in the C-C-C setup. It is a 200VA 12VAC toroid. I measured 17.2VDC on the PSU outputs.

I have placed an order for 10 .47ohm 3W resistors with some other misc stuff I needed...The voltage drop obviously will be negligible.

My HiFi2000 chassis shipped today so it should arrive in the next week or 2...cant wait to get it all assembled.
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Old 30th January 2010, 05:13 AM   #1280
Garyepe is offline Garyepe  China
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Default 3w 0.47r

Quote:
Originally Posted by bbakota2000 View Post
I need a favour from someone of you guys. I see almost all of you use those nice 3w 0.47r metal film resistors from Panasonic-ECG (digikey P0.47W-3BK-ND) as source resistors. I can't get them here in Europe and all non inductive 3w resistors I can get here are too long for the brian's PCBs. Digikey is charging too much for the shipping to europe ($44) for just a small envelope.
If someone is willing to sell me 30-70 pieces from their stock it would be great. Or maybe someone of you is ordering something for yourself from Digikey and is willing to order these resistors for me and send them to me in regular mail. I'll pay using Paypal.
In China the 3W 0.47R maybe can be cheaper than DIGIKEY .
I think can be use the China air post. the frieght just need about 15USD or less if you need 70-30 pcs metal film resistor.


Gary
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