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Old 12th July 2010, 12:04 AM   #1731
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Originally Posted by Salas View Post
Is the negative polarity the 197mA running one?
Er. Maybe?
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Old 12th July 2010, 12:11 AM   #1732
Salas is online now Salas  Greece
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The side with IRFP240s is the negative.
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Old 12th July 2010, 12:14 AM   #1733
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Originally Posted by Salas View Post
The side with IRFP240s is the negative.
I see. No, the 197mA is on the positive...

thanks for your patience. i've learned a lot w/ this build.
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Old 12th July 2010, 12:19 AM   #1734
Salas is online now Salas  Greece
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Its due to VGS variations between PMOS-NMOS and their batches if the LEDS are exactly the same. Natural. They also change VGS a little depending on current and voltage scale they work. Nothing to think about twice. Enjoy you integrated. See ya.
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Old 12th July 2010, 12:19 AM   #1735
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Originally Posted by regiregi22 View Post
AFAIK, it hasn't been tried yet (higher current than 205mA) in this design.

Looking at your picture, I can see a radioshack transformer. This has been VERY bad reported by other builders of this boards. The say that it runs very hot and buzzes.

I like your case, BTW

Regards,
Regi
Huh. Well since this entire enclosure is the heatsink maybe I'll be the first. I don't know if I can fit a 12w Mills in there though. Maybe 2 7R 5w in parallel for 3.5ohm?
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Old 12th July 2010, 12:25 AM   #1736
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Originally Posted by Salas View Post
Its due to VGS variations between PMOS-NMOS and their batches if the LEDS are exactly the same. Natural. They also change VGS a little depending on current and voltage scale they work. Nothing to think about twice. Enjoy you integrated. See ya.

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Old 12th July 2010, 12:34 AM   #1737
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Hey, anyone deciding to up your bias, dont forget that not only do you need a big heatsink, but you need a transformer that can handle it.
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Old 12th July 2010, 12:36 AM   #1738
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Hey, anyone deciding to up your bias, dont forget that not only do you need a big heatsink, but you need a transformer that can handle it.
how big a trafo?
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Old 12th July 2010, 01:35 AM   #1739
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I dunno what you will bias to, but you need to figure the draw of the entire circuit and get one that will cover that much power. Since you wont be worrying about taking care of big transients or increases in music draw I would multiply your bias by the number of devices by the voltage and perhaps double that. You dont want to push your transformer to the point of getting hot and saturating.
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Old 12th July 2010, 07:17 AM   #1740
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Hi Salas,
I build Hypnotize system, everything is great, except when power ON and relay Switch still OFF, I heard BIG humm and it disappear when switch ON.
What's wrong with my systemm ???

tq
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