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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 28th March 2020, 11:14 PM   #6081
morpheous is offline morpheous  Italy
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Thank you so much for your help!

And thanks for suggestions, the value 80 but I had found among the specifications of pre-amp, but I will use the values that you suggested to me. I hope to find resistance here it's all closed (food and pharmacies aside)

Third-week living closed at home almost all the time, here in Italy.
Stay at home stay safe enjoy lots of music.

Francesco.
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Old 28th March 2020, 11:43 PM   #6082
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Francesco hi

Two weeks of isolating here. Good luck to us all.
Regarding test resistors see what you got in your parts bin, maybe you could combine 10k 10K 3k3-5k6 2W resistors in series?
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Old 28th March 2020, 11:51 PM   #6083
morpheous is offline morpheous  Italy
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Hi Salas,

Good idea check, let me know how it goes thanks for everything.

Thanks
Francesco.
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Old 28th March 2020, 11:57 PM   #6084
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Or 56k//56k power resistors, something handy to can dummy test the reg. Let us know if the preamp's B+ rail consumption was something low indeed like 10-15mA per channel in the end or not.
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Old 31st March 2020, 06:15 PM   #6085
johnmarkp is offline johnmarkp  United States
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Salas

How much capacitance do you recommend between the diodes and the shunt regulator. I looked through a bit of the thread, but I realized it could take weeks.

John
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Old 31st March 2020, 06:49 PM   #6086
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Usually a CRC of not too big capacitors. 100-220uF each.
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Old 31st March 2020, 07:38 PM   #6087
johnmarkp is offline johnmarkp  United States
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Thanks, would CLC work. The two capacitors that I have are 450uf each.
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Old 31st March 2020, 07:44 PM   #6088
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
CLC is better but be aware of a choke's possible hum field if in proximity with signal gain stages. 450uF is heavy and can promote charge up spike. Are you familiar with PSUD?

PSUD 2.10 released

You can predict a smooth configuration with that one. By adding some extra R. Even small capacitors can be enough (and faster) for small load current (CCS mA) resulting to small ripple pk-pk if with CLC. Shoot for a smooth ramp up and no more than 1V pk-pk ripple I would say.
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Old 1st April 2020, 08:13 PM   #6089
morpheous is offline morpheous  Italy
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Hi Salas

finally, I have recuperated the resistance to do the tests.
At the moment I have the following problems my transformer has a 200 0 200 output and once CRC they become 260v so it is not good for the shunt?
Is it normal that with 200AC after the bridge (4x MUR 860G) plus filter capacitors and resistors I have 260DC?
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Old 1st April 2020, 09:43 PM   #6090
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
I would have expected 280V full bridge rectified from a 200VAC secondary. This shunt can work steadily even with only 10V in-out difference, so if the transformer is low or the R in the CRC too high, you could go for 250V reg output. If the R in the CRC can not help enough by choosing a lower value one.
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