Simplistic Mosfet HV Shunt Regs - Page 206 - diyAudio
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Old 16th October 2011, 02:33 PM   #2051
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Old 16th October 2011, 05:33 PM   #2052
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Looks OK.
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Old 16th October 2011, 06:10 PM   #2053
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Old 3rd December 2011, 05:59 PM   #2054
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Hi Salas. I am thinking to make shunt reg. to power a stereo tube preamp. (2x 6N1P). The in V is about 330V the +B of pream. is 260V. Which of the to circuits in first page should I use? Have I to change the values of resistors?
Thanks in advance Dade
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Old 3rd December 2011, 06:22 PM   #2055
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Wait a little, I will post a new better evolution really soon. In a few days.
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Old 3rd December 2011, 06:24 PM   #2056
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By how much does the 330Vin vary as mains voltage varies.
I would expect at least +-5%, but you could be unlucky and have a range approaching +-10%.

We/you need to know this to determine the maximum component ratings and the heatsink maximum dissipation.
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Old 3rd December 2011, 07:09 PM   #2057
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Thanks both
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Old 4th December 2011, 08:09 AM   #2058
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Hi Salas

I just built the HVSR and have checked all wiring twice. The 5.6K R5 start burning immediately when I apply 170V dc to the input. Can you advise what is the possible mistake I've made?
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Old 4th December 2011, 08:33 AM   #2059
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Something with the orientation or correct type of the MJE possibly?
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Old 4th December 2011, 09:03 AM   #2060
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Thanks Salas for your prompt reply. I am using MJE350 and will check the orientation again.
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