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Registered Member #2838
Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
I am working on steve wards sstc-5 (schematic below) I am having trouble with the IRFP260's overheating. I tried the "EBAY" IRFP460's that I had around and they died also. Actually they died much quicker than the 260's. I assume that they were knockoffs. And I am sure that the coil needs some fine tuning. Anyway, Here are my questions. 1) If I use IRFP460's vs the 260's, do I have to do anything differently with the circuit? 2) If someone could take a moment and help me choose a mosfet, that would be great. Mouser.com has several of each available and I do not know if there is a large enough difference between the $2 ones and the $10 ones to be worth the extra cost.
Here is the IRFP260's on mouser. Here is the IRFP460's on mouser.
Registered Member #2838
Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
I have it wired directly to mains as in the origional circuit. It is not drawing more then 5A because the 5A fuse didnt blow until after the mosfed did...
Registered Member #2838
Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Yea, I have been on the market for one for a while. I have a few variable transfromers but the largest one is 120v 2A. What do you think of these?
My bigest holdback is that I do not know which brands are good. I am sure that these are a cheap brand but atleast I know that there is a warrenty on them.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Hay ya those are the cheap china ones, and they will work as I own a couple of cheap china variacs. Just keep in mind that they will only handle like 2/3 the current rating reliably, as I found out with my cheap 20A china variac
On the other hand my 10A Powerstat variac kicks butt, it will easily handle 1.5x it's rating for short amounts of time! (BTW I found that one on ebay for like $30)
If you have a 2A variac I would try that out as it will handle higher currents for short amounts of time, and also the current draw will be a lot lower at lower bus voltages.
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Mosfet help please!
