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Old 7th June 2012, 08:41 PM   #291
RollE2k is offline RollE2k  Sweden
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Does anybody know where to find any heatsink in the same style as these - https://www.aavid.com/product-group/maxclip/one-piece
I want to be able to mount them through the bottom of the case. 5°C/W will do for me, since i will only dissapate approx 4W with the IRF.
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Old 9th June 2012, 08:11 AM   #292
bucurb is offline bucurb  Romania
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Default heat sink

I just did a search on farnell.com and found available a lot of similar heat sinks.
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Old 9th June 2012, 08:20 AM   #293
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I did not RTFM. And therefore did not connect the sense wires. With the result that R1 burnt out. Replaced it. Connected the sense wires. Started up again. And R1 went again only this time sooner.

I suppose I blew up one of the dn2450's?
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Old 9th June 2012, 08:21 AM   #294
bucurb is offline bucurb  Romania
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Default heat sink details

That's the link (I hope it will work):

OS515-50-B - AAVID THERMALLOY - HEAT SINK MAX CLIP - STANDARD | Farnell Romānia

AAVID THERMALLOY - OS515-50-B - HEAT SINK MAX CLIP - STANDARD 50MM,
4.89°C/W

more details (pdf file) about the heat sink:

European Extrusion Profiles
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Old 11th June 2012, 10:45 AM   #295
RollE2k is offline RollE2k  Sweden
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Oh, thanks for that.. although i did already order from mouser (as i needed alot more of components from there).
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Old 11th June 2012, 11:57 AM   #296
bucurb is offline bucurb  Romania
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Default SSHV2 package arrived

Hi,

I received my SSHV2 package today.

Thank you Salas and Tea-Bag.
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Old 11th June 2012, 12:06 PM   #297
Salas is offline Salas  Greece
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Quote:
Originally Posted by Bas Horneman View Post

I suppose I blew up one of the dn2450's?
Most possible. You could have blown even more semis though.
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Old 11th June 2012, 12:14 PM   #298
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Quote:
Most possible. You could have blown even more semis though.
Thanks Salas. I'll check.
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Old 12th June 2012, 11:28 AM   #299
bucurb is offline bucurb  Romania
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Default more questions

Hi Tea-Bag,

Do you have more PCBs and kits for SSHV2 please?

I work on SSHV2. Concerning JFETs I need to know how do I measure IDSS.
Let me know the criteria to select the JFET, please.

Thank you!

Warm regards,
Ion
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Old 12th June 2012, 12:43 PM   #300
Tea-Bag is offline Tea-Bag  United States
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Ion, I do have some kits and PCB's left. Only 5 PCB's - but plenty of minikits.

Here is a good link to measuring IDSS. try to find a JFET closest to 4ma (range is typically 3mv to 5.5mv). If you dont find one, then at least write down measurements in case there is an issue later. I throw in 3 so one has a better luck at finding an ideal one, or replacing a blown one if it comes down to it

Transistor matching
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