A bridge for each winding gains you a few things -
More current capability on the bridges
Distributed heat compared to a single bridge
A reduction in transformer physical hum when current draws change
Can you link to the PSU board you are using? I would like to see a closer photo of it.
More current capability on the bridges
Distributed heat compared to a single bridge
A reduction in transformer physical hum when current draws change
Can you link to the PSU board you are using? I would like to see a closer photo of it.
Here's the link: Heavy Duty CRC Power Supply Kit for Class A Ampllifier | eBay
So I think you're saying get four rectifiers, one for each winding, and parallel the outputs to the board? That makes sense to me if I'm going to go through the trouble of doing this in the first place. Just need to make sure i wire to the board properly.
I assume I can just leave the original rectifiers... They will basically act like shorts in this case, correct?
I'll go ahead and thermal paste them anyway to see if that cools them down appreciably as well. Not optimistic though.
So I think you're saying get four rectifiers, one for each winding, and parallel the outputs to the board? That makes sense to me if I'm going to go through the trouble of doing this in the first place. Just need to make sure i wire to the board properly.
I assume I can just leave the original rectifiers... They will basically act like shorts in this case, correct?
I'll go ahead and thermal paste them anyway to see if that cools them down appreciably as well. Not optimistic though.
just pull them out. then you short the pads for 2 of the 4 rectifiers.
like this:
like this:
Here's the link: Heavy Duty CRC Power Supply Kit for Class A Ampllifier | eBay
So I think you're saying get four rectifiers, one for each winding, and parallel the outputs to the board? That makes sense to me if I'm going to go through the trouble of doing this in the first place. Just need to make sure i wire to the board properly.
I assume I can just leave the original rectifiers... They will basically act like shorts in this case, correct?
I'll go ahead and thermal paste them anyway to see if that cools them down appreciably as well. Not optimistic though.
Attachments
So I think you're saying get four rectifiers, one for each winding, and parallel the outputs to the board?
No, you only need 2.
Parallel 2 of your windings two times, to get the transformer connected as intended.
Now you should have (2) 18v windings of 400VA each. Put a bridge on each.
I assume I can just leave the original rectifiers... They will basically act like shorts in this case, correct?
No. Remove them.
I'll go ahead and thermal paste them anyway to see if that cools them down appreciably as well. Not optimistic though.
It's worth a shot, but 15A diodes will not last long in that circuit even if cooled by submersion in a mountain stream...
@6L6 - Ah, gotcha. That makes sense. I was confused by "a bridge for each winding."
@AudioSan - your description is much simpler!
Thanks to both for your help! Much appreciated!
Now... to decide which rectifiers to get. Not sure I'm a believer in the super fancy ones, but then I haven't tried them before. I'm inclined to just the cheap 35A fairchild ones. Open to suggestions. Even the expensive ones aren't all that expensive I guess compared to the dollars I have in heat sinks alone!
@AudioSan - your description is much simpler!
Thanks to both for your help! Much appreciated!
Now... to decide which rectifiers to get. Not sure I'm a believer in the super fancy ones, but then I haven't tried them before. I'm inclined to just the cheap 35A fairchild ones. Open to suggestions. Even the expensive ones aren't all that expensive I guess compared to the dollars I have in heat sinks alone!
Now... to decide which rectifiers to get... I'm inclined to just the cheap 35A fairchild ones. Open to suggestions.
Just get the Vishay bridges with slow diodes in them. Nelson prefers them for high-current supplies. I will link to the article where he talks about it.
Ok, here it is - read the heading under "rectifiers".
http://www.passdiy.com/pdf/powersupply.pdf
If you want to use a snubber capacitor (the caps he mentions in the last sentence) place a .22uf film cap across the AC side of the bridge. At least a 63v volt cap. Easy!
http://www.passdiy.com/pdf/powersupply.pdf
If you want to use a snubber capacitor (the caps he mentions in the last sentence) place a .22uf film cap across the AC side of the bridge. At least a 63v volt cap. Easy!
There is no real need for the 1000v rating. Use the 200v... Nelson does.
If your box is bare, something like this seems good - ECQ-V1J224JM Panasonic Electronic Components | Mouser
If your box is bare, something like this seems good - ECQ-V1J224JM Panasonic Electronic Components | Mouser
@toufu - PM sent. Good to see a fellow San Franciscan on diyaudio!
@6L6 - Let me know if you find anything out. I'll probably just go ahead and order the 200V ones. Go with the devil you know and all.
Unless someone has 4 they have lying around they'd like to part with. Pet peeve paying more for shipping than the parts are worth! Too bad there's not amazon Prime for bridge rectifiers.
@6L6 - Let me know if you find anything out. I'll probably just go ahead and order the 200V ones. Go with the devil you know and all.
Unless someone has 4 they have lying around they'd like to part with. Pet peeve paying more for shipping than the parts are worth! Too bad there's not amazon Prime for bridge rectifiers.
6L6 - For the snubber caps, is .22uF critical? I have some that wima 1uF 100V caps and a few that are .1uF as well in the parts bin. I'll just order new ones if I need to... they're not that much anyway. Just feels good to use spare parts! =)
Also, could I use different ones for different rectifiers? Seems like a somewhat less than critical part where I can get away with that.
Also, could I use different ones for different rectifiers? Seems like a somewhat less than critical part where I can get away with that.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Amplifiers
- Pass Labs
- oneplustwo Aleph X build thread