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Old 7th July 2012, 12:37 AM   #1611
mjock3 is offline mjock3  United States
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I have replaced the heatsink with the other one full contact on back. It still gets very hot. I unplugged it after it hit 240 F. Dummy load does get warm. The transformer I am using is a Triad vps16-2700. Could that cause this?
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Old 7th July 2012, 12:46 AM   #1612
Salas is offline Salas  Greece
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Do you connect F+,S+ at one dummy's lead and F0,S0 at the other?
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Old 7th July 2012, 12:47 AM   #1613
mjock3 is offline mjock3  United States
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Quote:
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Do you connect F+,S+ at one dummy's lead and F0,S0 at the other?
Yes
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Old 7th July 2012, 12:49 AM   #1614
Salas is offline Salas  Greece
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Is IR9610 CCS Mosfet as hot? And what is the AC voltage on PCB's trafo connector while working?
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Old 7th July 2012, 12:56 AM   #1615
mjock3 is offline mjock3  United States
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Quote:
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Is IR9610 CCS Mosfet as hot? And what is the AC voltage on PCB's trafo connector while working?
Salas,

I am sorry it is the IR9610 that is hot, the 9530 is about 109 F. AC voltage at connector is 18.35 V.
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Old 7th July 2012, 01:02 AM   #1616
Salas is offline Salas  Greece
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Now we are talking. ~19W dissipation on it. Use half a secondary VAC.
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Old 7th July 2012, 01:13 AM   #1617
Salas is offline Salas  Greece
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Old 7th July 2012, 01:24 AM   #1618
Salas is offline Salas  Greece
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Old 7th July 2012, 01:49 AM   #1619
mjock3 is offline mjock3  United States
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Thanks Salas for all the help.
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Old 8th July 2012, 02:29 PM   #1620
acidbrain is online now acidbrain  Netherlands
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My shunts drive a (Salas)MC-pre, I changed the Vref from 2 to 3 red leds and lowered the R from about 900 to 380 Ohm. Most be subjective but I've got the feeling that the music is a bit faster and I'm hearing more fading instruments.

-Now for the 30V MM stage I want to use a combination of 3 LM329(6.9V) /4 leds / R about 220 Ohm

Salas, is the LM 329 the best choice or do you have another favourite ?
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