Simplistic Mosfet HV Shunt Regs - Page 283 - diyAudio
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Old 26th March 2012, 06:14 AM   #2821
Salas is online now Salas  Greece
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Have you got a scope? So to see the output and we get to know? Anyway, I would hook up one by one first to see if it is an interaction between the two, or which one board is the culprit dragging the other. I would check the boards if I could not find a dead semi, any. Is there rosin flux residue at the pads that may had cooked in the hot tube pre and suddenly got mildly conductive? Cold joint that played up with use? There must be something part defect or build defect wise going on for it to suddenly go ballistic hopping up and down. Check grounds, rework and clean up PCBs. But be sure about the semis first.
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Old 26th March 2012, 06:18 AM   #2822
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40mA with just 5mA @ 150V on its load per channel mean 5.25W on each 840 sink BTW. Do they cope well? Checked the temp on sinks?
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Old 26th March 2012, 06:22 AM   #2823
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Any sign that any electrolytic is exposed to long term heat and crapped out? Especially the small one across the LEDS?
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Old 26th March 2012, 06:35 AM   #2824
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Salas,

Too bad I can only spare more time at the weekend and it's too late at night now. I have to check it after work tomorrow.
Thanks

Albert
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Old 27th March 2012, 02:23 PM   #2825
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Quote:
Originally Posted by albertli View Post
Salas,

Too bad I can only spare more time at the weekend and it's too late at night now. I have to check it after work tomorrow.
Thanks

Albert
I have both regulators checked separately last night and both behaved the same. Since I had one channel 350/840 been changed. I query could there been the fault of the 12v zeners ??
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Old 27th March 2012, 02:34 PM   #2826
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Every semi could fail including Zeners. Although I am not familiar with that board's possible weak spots, I always made it P2P, its 3 things that can fail in previously working boards. The semis, the passives, the joints. Else something else changed in the served circuits (but you said no new mods) then it should be traceable eventually. Being both regs ill, its suspicious it was a transient and they got the same hit.
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Old 28th March 2012, 02:34 PM   #2827
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Quote:
Originally Posted by Salas View Post
Every semi could fail including Zeners. Although I am not familiar with that board's possible weak spots, I always made it P2P, its 3 things that can fail in previously working boards. The semis, the passives, the joints. Else something else changed in the served circuits (but you said no new mods) then it should be traceable eventually. Being both regs ill, its suspicious it was a transient and they got the same hit.
Salas,

The only way I could do is blind touch now for the voltage swing quite seriously. It goes the way up to the supplied voltage even I have the voltage tuned to the desired 150v. Since I made changed 350/840 on one channel, I'll keep changing all others parts, procedure wise, to see if I could source the problem.

Albert
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Old 31st March 2012, 01:27 PM   #2828
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What do you use for a heat sink for Q1 and Q2? What is the board set up for?
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Old 31st March 2012, 02:20 PM   #2829
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What do you use for a heat sink for Q1 and Q2? What is the board set up for?
Check these parts out on Mouser.

Mouser #: 567-647-10ABP

Mfr. #: 647-10ABP
Manufacturer: Wakefield
Desc.: Heat Sinks TO-220 W/PINS BLK 1"

567-274-1AB

Mfr. #: 274-1AB
Manufacturer: Wakefield
Desc.: Heat Sinks TO-220 LOW PROFILE
RoHS: RoHS Compliant




Mouser #: 571-7969494

Mfr. #: 796949-4
Manufacturer: TE Connectivity
Desc.: Fixed Terminal Blocks 5.08MM VERTICAL 4P wire protector

Mouser #: 571-7969492

Mfr. #: 796949-2
Manufacturer: TE Connectivity
Desc.: Fixed Terminal Blocks 5.08MM VERTICAL 2P wire protector
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Old 7th April 2012, 02:49 PM   #2830
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Default Irf9240

Hi all:

I have a partially assembled pcb (SSHV1) on my workbench but for some reason lost the ir9610 and I can not finish the project.
I can use a irf9240?
I have to do some other modification?

Thanks.

Alberto.
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