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Old 24th June 2006, 09:51 AM   #1
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Default Beginners' Aleph-X Production Diary

IRFP044 Paired in 8 fets, all the way from Germany!

Thanks for one of the user in diyaudio.
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Old 24th June 2006, 09:52 AM   #2
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Capacitors are from RS
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Old 24th June 2006, 09:54 AM   #3
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BHC 47000 uF 25V X 8
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Old 24th June 2006, 09:55 AM   #4
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Paired Fets
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Old 24th June 2006, 09:57 AM   #5
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The Progress.
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Old 24th June 2006, 09:59 AM   #6
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Progress 1 Another angle of those gigantic heatsinks
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Old 24th June 2006, 11:29 AM   #7
EUVL is offline EUVL  Europe
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Glad to see you making progress.

Patrick
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Old 24th June 2006, 08:33 PM   #8
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I am sorry that i didn't contact you for so long, as i havn't done anything to those fets, now i have mount them onto the heatsinks and make sure them they are all insulated.

The next step is to connect them up to the board.

Angus
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Old 24th June 2006, 08:43 PM   #9
jleaman is offline jleaman  Belgium
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Take you'r time It will pay off
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Old 25th June 2006, 04:56 AM   #10
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I assume you use thermal grease.
Do you have mica insulation in between (I would recommend) ?

Use the thermal grease sparringly. You should only smear on a thin layer uniformly on both sides of the mica with your finger. The grease is actually not very thermal conductive compared with metal, as it contains silicone grease and aluminium oxide particles. So you only need just enough to bridge any uneven gaps. The mica will do the insulation for you.

If you have a laboratory supply, set the voltage to your working voltage (per FET) and current limit to just over your bias current. Use a separate 9V battery with a 1k trimpot to set bias across gate and source resistor (starting from less than 3V and increasing slowly to something like 4V). After it is operating at the right voltage and current for say 5 minutes, measure the temperature at the heatsink and at the transistor METAL case. The difference should not be more than 8 degC. Then you know your thermal grease is not excessive. Of course check the insulation first between transistor & heatsink with a multimeter. Many multimeters also have temperature measurement (thermocouple) capabilities.


Patrick
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