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Old 8th August 2010, 11:20 AM   #1951
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Quote:
Originally Posted by flocchini View Post
HELP

Problem with Salas HV
Using 0-250 Rcore -260V AC at input

250VDC after rectifier?

Have blown 2 9610s
THe 470 ohm resistors start smoking after 2 seconds. Obviously too much current

No obvious shorts on board.

Where do I start troubleshooting

Thanks

Bob
You see this image
What about the Led??
May be Mje 350 died , so 840 get all mA
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Old 8th August 2010, 01:08 PM   #1952
hotzman is offline hotzman  Romania
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Hi,
I completed the Salas HV! Everything is perfect, I can adjust the output voltage ,but IRF840 is very hot and smoke somewhere !!!!
Forward suggestions!
Thank you!
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Old 8th August 2010, 02:58 PM   #1953
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Did you use a load when adjusting the voltage? You should have it. The IRF840 accounts for 20% of the true load.
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Old 8th August 2010, 04:43 PM   #1954
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QuangHao:

Thanks for the reply.

I have the IV and Salas HV board which I am building to power the E182CC IV board.
I will check the MJE 350.
The 3 LEDs light.
R1 (33 ohms) is also very hot so it draws excess current.

Oh. I don't have a 1N3838 installed. Did not see it on the BOM. Will try to find one in my parts.

Best

Bob
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Old 9th August 2010, 10:37 AM   #1955
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flocchini
No use 1N3838 ! I not like it!
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Old 10th August 2010, 12:10 AM   #1956
hfar is offline hfar  Portugal
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Quote:
Originally Posted by quanghao View Post
Hi all!
I plan to make PCB for i / v DAC use:
1. PCB use E182CC tube and output transformer.
In this link circuit:
DAC End - the AD1865N-K with single ended vacuum output stage
2. Using A844 PCB Opam

What you are interested please subscribe to the list:
1..
Hi Quanghao,
Sorry for this question, but I think that you are thinking to provide separated entrys for power supplys, mainly for separated channels. This is correct?
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Old 10th August 2010, 12:21 AM   #1957
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Per Quanghao I will not use the diode across the 9610.

I found out that my 47 ohm resistors were 470 ohms not 47. They are marked 47. This happened to a fellow DIYer a couple of years ago. I usually check with a meter before installing but became impatient. Live and learn. I have replaced semiconductors and will see how things go later tonight.
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Old 10th August 2010, 02:42 AM   #1958
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Quote:
Originally Posted by hfar View Post
Hi Quanghao,
Sorry for this question, but I think that you are thinking to provide separated entrys for power supplys, mainly for separated channels. This is correct?
Hi! i use SSHV for All project. In thi case have one tube E182CC, and need 20Ma for tube, so one supply it is good??
Do you have any idea? Can you tell me please??
Thanks
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Old 11th August 2010, 03:41 AM   #1959
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Everything is working with the Salas HV part of the IV - Salas HV board. It is providing 270V to the e182CC IV board.

Thanks to all

Best

Bob
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Old 11th August 2010, 03:45 AM   #1960
Salas is offline Salas  Greece
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Where did you put a 470R instead of a 47R? On the base of the MJE?
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