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Old 13th July 2006, 11:27 AM   #1101
yoke is offline yoke  Croatia
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Default Re: supply voltage aleph-x

Quote:
Originally posted by Chois¢â
Hi

This is my second project about aleph.
I want to change the supply voltage +/-22V to +/-18V.
What parts should I change on circuit?

Thanks
I would like to use +/-18V olso...so any toughts what to change ???
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Old 17th July 2006, 06:48 AM   #1102
Nixie is offline Nixie  Canada
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Since the IRFP240 flanges are coinnected to the drains, can I mount all on one side and half to copper bus bars without insulation, and put the insulation between the copper bus bars and heatsink?
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Old 1st August 2006, 06:00 AM   #1103
Nixie is offline Nixie  Canada
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Wow, two weeks and no reply...
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Old 1st August 2006, 06:03 AM   #1104
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by Nixie
Since the IRFP240 flanges are coinnected to the drains, can I mount all on one side and half to copper bus bars without insulation, and put the insulation between the copper bus bars and heatsink?

NO don't do that.. You should buy some ceramic isolation pads. Do you want a pic of what they look like ?

Jase
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Old 1st August 2006, 06:46 AM   #1105
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OK, and what's the reason then?
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Old 1st August 2006, 06:49 AM   #1106
jleaman is offline jleaman  Belgium
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Because you will short each of them together....
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Old 1st August 2006, 06:52 AM   #1107
Nixie is offline Nixie  Canada
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I'm talking of using multiple paralleled output devices (12 per monoblock), and having the paralleled ones on the same bus (3x). They're already connected at the drains anyway.
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Old 1st August 2006, 07:03 AM   #1108
jleaman is offline jleaman  Belgium
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Can't said we didn't warn you.. But hey if you have loads of money go nut's.

J'
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Old 1st August 2006, 07:09 AM   #1109
Nixie is offline Nixie  Canada
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That still doesn't answer my question, what exactly is wrong what I suggested? If I have 12 devices per channel, the drains of the four 3x pairs are all connected together in the schematic. So why do you think they flanges should not make contact with each other through a piece of copper bus bar (that's itself insulated from the heatsink)?
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Old 1st August 2006, 07:47 AM   #1110
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Quote:
Originally posted by Nixie

. . . having the paralleled ones on the same bus (3x). They're already connected at the drains anyway.
You would hardly see what is wrong.

I wonder how you are going to plan the electrical insulation
and thermal conduction between the bars and the heat sink.
If you have any solution to this question. . . why not. . . ?
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