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Old 6th October 2004, 10:29 AM   #1
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Default New Ultrafast Diode Bridge group buy?

Well, after being fairly lazy about trying to sort this out I guess I have the time to try and sort through this now, so here it goes.

What I will be doing here is offering up a board very similar to that which was made last time round which will accommodate a set of ultra fast switching diodes (either dual TO-247 devices, or single TO-220) along with a snubbing network and space four heat sinks etc.

There will be some minimum order numbers which I will have to hit before this becomes worthwhile doing though, which would be 100 of the PCBís and at least 25 full setís of component kits (although again like last time I will try and supply the spade PCB connectors as Iím not sure how easy these will be for people to et hold of individually)

You can see a picture of the board in an assembled state at the end of this little lot of text, and I will include a description of the components which would be in the kit on the wiki page which I will go and set up now to try and gauge interest in doing this again, but if any people have any questions about things then feel free to post on here and I will try and answer them as quickly as possible (which also goes for the pricing which I will have to go off and work out for the component kits now, but which would probably remain at £4 per PCB as it was last time so long as the board house donítí charge me any more this time).

Andrew.


Old Component order page
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Old Component order page
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Old 6th October 2004, 10:32 AM   #2
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Just one more picture to give a clearer look at teh PCB and show the alternate method for cooling if you want to put a lot of current through the diodes.

EDIT:

Ok, here is the link to the new wiki page, it doesn't have much information on it yet, as most of that can be found in the old threads (or you could ask here) and I have to head out now so it may be added at a later date if this looks like it will take place again.

Andrew.

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Old 6th October 2004, 12:22 PM   #3
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I only want to remind you that your insulation distances are too small. I recommend that you increase them to 1 mm or more. Calculate for max voltage 200 volts at least.

You may also place the pads in zick-zack so you get more space. What don't you place the e TO220 devices a bit from the heatsink. It's easier to bend these TO220's compared to the TO247's.
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Old 7th October 2004, 02:27 AM   #4
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I'm in for three kits and three boards.
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Old 7th October 2004, 03:35 AM   #5
cowanrg is offline cowanrg  United States
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ill throw down for four of them. the aleph2's will need a good rectifier
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Old 7th October 2004, 01:13 PM   #6
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Thanks for starting up this thread

Before signing up in the wiki I would like to know if it's possible like the last time to get the kit without diodes and if so what the price will be?

Martin
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Old 7th October 2004, 01:24 PM   #7
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As long as there are sufficient order numbers to hit the price cuts that I need to place the orders I should have no problems with people taking the components they want for the boards. However, as I doub't this will be as large an order as last time if it does go through, it will probably work out a little more for some of the components, so you could expect I think a price of around £9.00 for a PCB and all of the componets apart from the diodes (although this could be a bit more if I can't get the parts from the same sources as last time)
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Old 9th October 2004, 04:44 PM   #8
Clarkcr is offline Clarkcr  United States
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Hey this is just what the doctor ordered... I've been looking for a high speed diode set for my Aleph 1.2s I'm building. I guess this is it???

Tell me....I'm using a 2000VA 50v dual primary toroid and 6 72,000uF caps to make a CRCpi type PSU with some resistors inbetween the first four 72KuF caps and the last two 72KuF caps. Is this the fastest switching setup I could get for my project?

What is the difference between this and a "hexfred" setup? I am told by a good friend of mine that I should use 8 hexfred high spped diodes in TO247 cases. I see from the picture that there are four per PCB.....if I'm using dual primaries, then could I benefit from using one of these boards (4 diodes) per primary out from my trannie? In other words two PCB setups per chassis?

Sounds good. Someone school me and I'll be in.

Thanks

Chris
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Old 9th October 2004, 05:56 PM   #9
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Hi, as this is a fairly generic PCB allowing you to use any suitable connected single TO-220 or double TO-247 diode type package you should be able to find a device which will do what you want it to for your amp (the diodes that were in the kits last time were the ones that are used int he PASS labs amplifiers so they should be a good starting point for you to look at).

Also, the way the PCB is configured, it is equaly possible to use one or two of them for a single supply (so long as you have dual secondaries on your transformer which it looks like you have) depending on what you fancy putting into your amp.

Anyway, hope this has answerd your questions, but if it's not specific enough, just let me know and I'll try to clarify things a bit more.

Andrew.
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Old 9th October 2004, 06:11 PM   #10
wytco0 is offline wytco0  United Kingdom
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OK silly newbie question time again!

Why can't centre tapped transformers be used with this board?
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