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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 16th January 2009, 08:52 AM   #81
milen007 is offline milen007  Indonesia
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hi Salas

i am wondering if i could still power the shunt reg with tube regulator i am using now? its EZ81 (max current is 150 according to link below). will it capable to supply the current the shunt reg needed and dissipated?

http://www.mif.pg.gda.pl/homepages/f...001/e/EZ81.gif
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Old 16th January 2009, 02:00 PM   #82
Stixx is offline Stixx  Germany
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Quote:
i am wondering if i could still power the shunt reg with tube regulator i am using now?
Do you mean tube rectifier or tube regulator...?
I suppose you mean tube rectifier which will be no problem (see posting No 8).

I will be using tube rectifiers myself...
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Old 16th January 2009, 02:04 PM   #83
inertial is offline inertial  Italy
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Hi,

Seems to me Lynn Olson employ shunt tube regulators in his preamp

see here http://www.nutshellhifi.com/triode1.html

Paolo
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Old 16th January 2009, 03:09 PM   #84
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally posted by milen007
Hi Salas

been ordering part for this shunt reg. just wondering if there need to do some adjustment for output voltage of 140v and current around 40mA using the 1st schematic? i guess this shunt reg will deliver more than triple than required current. think its good right?

one channel only draw 20mA. do you suggest i run 2 shunt reg or just share a single one?

any help really appreciated

regards, Erwin
Share one for both channels, post#2 schematic. If you want to make double mono PSUs keep it as is, triple current is better.

You can use any tube rectifier. Only calculate the mains transformer and rectifier drop for ICCS current correctly, so to always have a DC in that must be about 50V more than needed output.
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Old 16th January 2009, 04:08 PM   #85
milen007 is offline milen007  Indonesia
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ops typo. It's tube rectifier.

Nice. I have plenty voltage to drop. Is it recommended to use choke of 25H of unknown quality or I better of using none? Thx Erwin
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Old 16th January 2009, 04:20 PM   #86
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Use a small one that will not saturate at nominal Reg current draw. A few H with low DCR so to not lose voltage. Or CRC with 220R. In general the ICCS in the reg keeps the ripple out. It only needs to be some logical ripple magnitude. Only be sure of what raw DC value you are going to end up feeding the reg with. A simple way to be safe when deciding about transformer and pre filter is to simulate in Duncan's free PSU simulator. Google for it, if are not already using it.
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Old 17th January 2009, 03:28 PM   #87
sesquialtera is offline sesquialtera  United States
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Quote:
Originally posted by milen007

sesquialtera, the pcb you design is base on Salas' shunt reg is for sale or personal use? if you make it.. i would like to have 2 pls
I was planning on ordering only a few pcbs for personal use. If you want some, you can order a batch from http://www.expresspcb.com and use the file I have attached in a previous post. Be warned that I'm a newbie to this and have not real-world tested it yet!
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Old 17th January 2009, 04:00 PM   #88
sesquialtera is offline sesquialtera  United States
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Board size changed to conform with expresspcb's Mini board service.
Attached Files
File Type: zip simplistic shunt reg.zip (8.6 KB, 389 views)
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Old 18th January 2009, 05:56 AM   #89
JC951t is offline JC951t  Taiwan
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Hi Sesquiatera,
Sorry, do you have another format. I can't read the zip file.

Thanks
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Old 18th January 2009, 08:55 AM   #90
pchw is offline pchw  United States
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally posted by JC951t
Hi Sesquiatera,
Sorry, do you have another format. I can't read the zip file.

Thanks
If you are using Windows, just add .zip to rename the file, and it will open it.
If Mac or Linux, just run unzip will do.
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