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Ultra Fast Diode Bridge.

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#101
DAU

I orderd a load of Fischer "finger" heatsinks from DAU and there were here in a couple of weeks, or so. That was ex-works in Germany, too.

I think the 6 weeks is bet hedging! 😉

How are the sinks to be fixed to the PCB? A blob of solder or an M3 nut??

Cheers

Jon 🙂
 
#102
Any recommendations as to what components I should populate my boards with?

I ask because I will be using surplus EI frame transformers (they are hefty though, 20 or 25 A rated, and copper clad), and so I do not want to go to the expense of the pricey BYW99W-200 if they will give little benefit with cheaper transformers.
 
#104
Also, Just a heads up for everyone else, the order will be closed from tomorow night, so if you do want to put yourself down for any more boards, you will have to do so by then.

Also, I will be placing the board order next week, so I would appreciate it if people could contact me with regards to payment by the 10th of march at the latest.

Thanks,

Andrew.
 
#106
bigparsnip said:
what sort of current will you be running through the rectifiers, and what voltage are your transformer secondaries, as these are the two most important things to cinsider when you are specifying the parts to use.
Click to expand...

The secondaries are 15VAC. For current draw, I plan to try first is 20A and see if the transformers can handle it. If not I will reduce them to 10-15A.
 
#108
I'm affraid if you want to run them at up to 20A, I think you will have to stump up for some of the ones you mentioned (or something very similar) with the two diodes in the one TO-247 package, as I can't realy find anything else that will compare at a much lower price. The MUR3020Wt's may be a bit cheeper if you can find somewhere to get your hands on some, but I wouldn't think that these will work out much cheeper in the end.
 
#111
I may be able to do that, however, I will have to check a couple of things out, as things could get very tight (with my lossing a bit to paypal; who are taking more than I thought, and for the terminal lugs) but, hopefully I might still be able to sort something out. I guess we'll just have to wait and see.

😕


edit:

Actualy, I wasn't thinking too straight there. If you look at what you have done, you are assumoing that I am selling all 209 boards at £3.50 to make up the £732. However I will still only be selling the 183 that are signed down for on the wiki.

So, at 183 x £3.50 that only comes in at about £630, which is quite a bit shrot of what I will need, and I will be left with a lot of spare boards for myself to try and sell later on (which I can't afford to do unfortunately).
 
#113
BP,
I think SvErD does bring up a good point though. Still charge everyone £4.00, which currently will net 191 x £4.00 = £764.00.

Order £764.00/£3.50 = 218 boards. With the excess 27 boards you could:

1) keep them for youself, netting a lifetime supply of rectifier boards 😀

2) sell excess boards and keep funds and/or donate to diyaudio

3) distribute excess boards to group buy participants
 
#114
I realy should read posts properly before repling, I thought you were saying the same thing again. Oops.

It is something I will have to consider, but as the boards come in some random multiple based on how many you get to a pannel (to get the price down lower) I will be quite close to the actual order size and prbably woun't get many more spare without going and ordering a whole nother pannel of boards which I think would be about another 50 or so (too many for me to afford without any intrest).

:xeye:
 
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