Someone mentioning here that Richardson Electronics had a great price on the IRFP044 at about $0.90 a piece. Digkey sells them for about $2 each.
I tried ordering 50 yesterday. Unfortunately, I got a call today and was told that the minimum order for this was 350 pieces because it's a special order item.
It wouldn't take very many people to pool together to reach the 350 piece order.
I tried ordering 50 yesterday. Unfortunately, I got a call today and was told that the minimum order for this was 350 pieces because it's a special order item.
It wouldn't take very many people to pool together to reach the 350 piece order.
Kevin, I was hoping someone would step up to coordinate a group purchase! 
I would definately be in for 50 pcs. Btw, did you try to place an order and run into the same thing I did?
Magura, getting matched pairs would be ideal, but it sounds like a lot of work. Anyone willing to volunteer?
Incidentally, at an order quantity of 350pcs, the mosfets drop down to $0.87. Strangely, there are no further price reductions - even up to 25,000 pieces!
I would definately be in for 50 pcs. Btw, did you try to place an order and run into the same thing I did?Magura, getting matched pairs would be ideal, but it sounds like a lot of work. Anyone willing to volunteer?
Incidentally, at an order quantity of 350pcs, the mosfets drop down to $0.87. Strangely, there are no further price reductions - even up to 25,000 pieces!
I didn't follow up on the "on order quote on the web page due to the fact I'm still making the chassis.
From Richardson you can get the r-theta E3093/wakefield 6274 in 18" lengths for $51!!! as far as I know they had 19 units in stock when I ordered mine.
The arrived un-anodised with a few cosmetic dings here and there but still an excellent price. A Bargain!!!!
Lastly if you need a source for transformers you can find a seller on e-bay selling 13v transformers on e-bay rated at over 50A for $25 each, these are from APC UPS's a pair of those with the secondaries in series makes good sense for 15-16v rails.
I'll get back to this thread shortly as I'm taking care of the wife after surgery and being in pain she's a little cranky so gotta go for now, speak soon.
Kevin
From Richardson you can get the r-theta E3093/wakefield 6274 in 18" lengths for $51!!! as far as I know they had 19 units in stock when I ordered mine.
The arrived un-anodised with a few cosmetic dings here and there but still an excellent price. A Bargain!!!!
Lastly if you need a source for transformers you can find a seller on e-bay selling 13v transformers on e-bay rated at over 50A for $25 each, these are from APC UPS's a pair of those with the secondaries in series makes good sense for 15-16v rails.
I'll get back to this thread shortly as I'm taking care of the wife after surgery and being in pain she's a little cranky so gotta go for now, speak soon.
Kevin
Ok, I have set up a basic WIKI page now and included everyone who has already posted here onto the list (274 so far, not too far of the target), but it would be good if the people organising this would add some of their own information to the page, as at the minute I'm not 100% sure of the price or definate part type.
Andrew.
IRFP044 Group Order WIKI Page
Andrew.
IRFP044 Group Order WIKI Page
the heatsink profiles I may have named incorrectly, here is the link on the wakefield site.
Wakefield extrusion
and the R-Theta site seems to be down right now.
Kevin
Wakefield extrusion
and the R-Theta site seems to be down right now.
Kevin
Ok people.......there is a new thread titled IRFP044 Group Order over on the pass labs page, please submit andy and all enquiries to this page. I'll have it book marked. Anything else I guess you can send me an e-mail. Don't forget to update the wiki if you are interested.
Thanks Guys and Girls
Kevin
Thanks Guys and Girls
Kevin
Oops, this group buy has come up too quick as I have yet to figure out how many IRFP's I can use.
I am going to be building a case made from the heatsinks shown in the attached picture. They are big (15.5" x 3" w/ 1.5" fins), but the fins are epoxied (!). I will use 5 per channel. They are surplus so I have no specs. I will be running +/- 18VDC rails at 10 amps per channel.
Must I limit myself to 1 IRFP per sink or can I run more? I know this is guesstimating, but any help is appreciated.
I am going to be building a case made from the heatsinks shown in the attached picture. They are big (15.5" x 3" w/ 1.5" fins), but the fins are epoxied (!). I will use 5 per channel. They are surplus so I have no specs. I will be running +/- 18VDC rails at 10 amps per channel.
Must I limit myself to 1 IRFP per sink or can I run more? I know this is guesstimating, but any help is appreciated.
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