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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 29th January 2012, 10:47 AM   #2621
Stixx is offline Stixx  Germany
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Quote:
Some says tube rectification will cause the input voltage variation to *any* regulator may result in it dropping out of regulation. That's why SS rectification is more preferable.
I am not Salas, but I can assure that all Salas shunt regs are working perfectly with tube rectifiers.
This has nothing to do with solid state or tube... a tube rectifier drops a certain voltage , so do take that into account.
Get PSUD2 (free) and start fiddling.. just choose your Vin at least 20V higher than your Vout and you won't have a problem...
Regulating to 400V might be borderline and has been answered numerous times, but I'll leave that one to the Master.
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Old 29th January 2012, 06:51 PM   #2622
buzzforb is offline buzzforb  United States
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Due i need a load resistor totest sshv2 and what value?
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Old 29th January 2012, 07:27 PM   #2623
vgeorge is online now vgeorge  Greece
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Simplistic Mosfet HV Shunt Regs
If you don't know your target load, 15k is a safe value. Be sure to be more than 5w, better 10w.
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Old 29th January 2012, 08:19 PM   #2624
euro21 is online now euro21  Hungary
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Testing dual SSHV2.

Raw supply: 240V ct - AZ1 mesh- 5.4uF -10H (100R) - 47uF -3H (80R) - 220uF -> 254V
20mA CCS, 7mA load (#26 preamp), 220V.

Noise below 1mV (in the other side 2.5mV)!
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File Type: jpg my SSHV2.jpg (71.7 KB, 410 views)
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Old 29th January 2012, 08:57 PM   #2625
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Post some scope screens if you can. You measure on preamp's output, or on the rails? Maybe you got some more 50Hz on the 2.5mV channel? Twist output pairs.
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Old 29th January 2012, 09:19 PM   #2626
euro21 is online now euro21  Hungary
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My measuring was on dummy load (30K -3*10K 5W) with dual channel (Kenwood VT-176) AC millivoltmeter (330uV-100V).
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Old 29th January 2012, 09:22 PM   #2627
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Ah, OK. Move the mains cable away maybe. Nice proto board work. Do you use SA1381 and SK117? How's drift?
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Old 29th January 2012, 09:33 PM   #2628
euro21 is online now euro21  Hungary
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Yes, SA1381 and 2SK117GR (3.7mA, 3.92mA).
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Old 29th January 2012, 09:52 PM   #2629
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
OK, fine then. Use 27-30mA CCS if you can. So 20mA goes to the reg alone. Which one of two trimmer you had substituted for fixed resistor? I think I see less than 4 trimmers on the pics.
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Old 29th January 2012, 10:00 PM   #2630
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With variac turned all the way down and only 1.5V on the rail, i already have 22mA of cuurent across test point on sshv2.
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