SissySIT

[noelectrix]

50W instead of 100 , per heatsink , will tell you nothing

remember that things aren't linear in thermal system

i accepted the idea of going dual mono, so it would be the one tokin per sink for real

 

[Zen Mod]

good!

just to remind you , for test you don't need isolator between heatsink and SIT case

just remember that (then) heatsink is on Ub+ potential , take care not to short anything

smidge of thermal goo is all you need

 

[noelectrix]

yes, its already mounted and me almost concious : ) (but i´m just afraid to make it with 50k volume pot, there is too small region to trim), i´ll try to get a multiturn 10k today.

another one, when i took off the F6 PCB from heatsink, having been insulated with keraterm, i saw little holes in the pad, obviously not so good idea to use them twice!

 

[Zen Mod]

I believe you'll find Keratherm in 10x10cm format at Conrad.de

though , that damn thingie is so massive , for 50W of heat , evem 0.1mm thick mica is overkill , with goo of course

I'm regularly using punch method for opening holes in mica , in this case nice** M5 bolt (as punch) and M5 nut (as female ) will do the job , if you find mica sheets

**means proper clean forehead of bolt

edit: just imagine I break this post in 4 separate ones , and everything is easier to grasp

 

[noelectrix]

edit: just imagine I break this post in 4 separate ones , and everything is easier to grasp

just finished the "conrad" part, feel exhausted, 'nough for today

happythanx!

 

[noelectrix]

i measured the first at Ugs -2.4V it comes up to 2A (btw, does Amperemeter has any kind of direction red/black cable? never measured Ampere : ))

I let it run for just two minutes or so, but could hardly feel any warming of the big Tokin.

 

[Zen Mod]

red probe on PSU + , black downstream

irrelevant , just ignore minus prefix on reading if you turned probes

what was PSU voltage ?

 

[noelectrix]

ok, it warmes up after 2 minutes

 

[noelectrix]

what was PSU voltage ?

23V

 

[noelectrix]

exactly same for second puck, 2A at 2.3V Ugs

 

[Dennis Hui]

Very good. I think you're set.

 

[Zen Mod]

yup

pretty much anything up to -3V7 ...... and even more ...... say -4V2 , if you select P channel mosfet , to have -4V5

say that 300mv is smallest voltage window for opto bjt , with which I would have nice sleep

 

[noelectrix]

oki, nice, i thought of voltage window could be too big either. Also i was curious about consistency, because the 2 pucks looked a little different concerning the print and other details..

(had a memo on the table, "BATTERY ON!"

 

[Kris0603]

@noelectrix

Could you snap a picture of the Tokins? Not sure what the recommended image host is, i used tinypic.

 

[Zen Mod]

shrink them to 1200xsomething and post here

I hate hosts , damn pics always missing

 

[noelectrix]

i´m sorry, back home from studio were the tokins are, sitting happily at home eating spaghetti, will post pics soon.

 

[Zen Mod]

post pics of spaghetti , tokin pics are good tomorrow

 

[Soundhappy]

post pics of spaghetti....

 

[noelectrix]

camera in studio also, me not havin smartphone, but this wasn't bad either : )

An externally hosted image should be here but it was not working when we last tested it.

 

[noelectrix]

i´m just asked to enter url, not seeing possibility to insert <1200 px pics?