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Old 11th March 2013, 02:59 PM   #3811
Salas is offline Salas  Greece
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Quote:
Originally Posted by Alex M View Post
I have just installed a couple of SSHV2 regulators in my RTP3. These replaced the Emile Sprenger HPHV shunt regs, which I have had persistent problems with over the years.

Initial signs are very positive - I will post an update and photos in due course!

Many thanks for your efforts, Nick!

Alex
Will be glad to see. Congrats.
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Old 11th March 2013, 03:02 PM   #3812
Salas is offline Salas  Greece
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Originally Posted by stajo View Post
Hi

For my burfday I wish me a split SSHV2.5 for smaller preamp stuff. One CSS module eating the 20 mA extra current and 2 output/Vref sections, one for each channel.

Purpouse would be optimum channel separation without having to burn an extra 20 mA per channel for applications that might only take 10 for them selves. That would make need for smaller trafos, lesser EMC etc.

Do you think it would be fruitful for me to experiment? Is it possible to split to 2 mosfet/Vref sections after CSS?

best
Staffan
The extra 20mA is not for the CCS's benefit but for the shunt part(s). So you can't sidestep it by Y feeding. You will still need 20mA extra for each output.
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Old 11th March 2013, 04:29 PM   #3813
stajo is offline stajo  Sweden
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Quote:
Originally Posted by Salas View Post
The extra 20mA is not for the CCS's benefit but for the shunt part(s). So you can't sidestep it by Y feeding. You will still need 20mA extra for each output.
Thanks Salas. I realise this now. My slow thinking brain worries about channel separation with 1 SSHV for both channels but I should let it go because of the sturdy regulation cancels it I guess. Im thinking linear PSU.

Staffan
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Old 11th March 2013, 07:36 PM   #3814
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I have bought two SSHV kits from Tea-bag for my 3A5 phono amp
In the manuel the output voltage runs from 100 vdc , but I need 80vdc.
Can I use the kit
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Old 11th March 2013, 08:49 PM   #3815
Salas is offline Salas  Greece
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Only if you will replace the 68k resistors with smaller. Say 33k.
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Old 11th March 2013, 08:53 PM   #3816
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Thanks Salas
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Old 12th March 2013, 10:49 PM   #3817
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Hi Salas,
1. It looks to me like the CCS part of the SSHV (Simplistic Mosfet HV Shunt regulator) regulator (or any shunt regulator) is needed mainly to provide good line regulation. Is that correct?
2. Suppose I'll feed the SSHV with a regulated HV, (from a Maida-like regulator), can a resistor replace the CCS part without any degradation in the SSHV performance?

I ask it because I'm concerned about RFI creeping in to the amp circuit.
The PSU is going to be placed in a separate box (LCRC or LCRC + Maida-like). Whatever one may do in the PSU box, RFI will creep in, even by radiation, to the wires connecting the PSU box with the amp box. Therefore, I prefer having RC filtering in the amp box, both for the (+) and the (-) wires. It seems to me that resistors will have better HF and RF rejection than the DMOS CCS.

Another question:
3. Is there any potential problem with feeding the SSHV with gradually rising HV, either with or without the CCS section in the SSHV?
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Old 13th March 2013, 08:55 AM   #3818
Salas is offline Salas  Greece
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1. No, its for isolation.
2. No, different purposes.

Battling RFI is shielding and filtering to the 9th degree. In all boxes. If there is measured contamination in the first place.

3. No if its lowest point is at least 10 Volt higher than the set output and its top isn't high enough so to overheat the reg and/or challenge its max in spec even briefly.
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Old 13th March 2013, 05:15 PM   #3819
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Thanks, Salas.
As for the CCS part, you say it's for isolation. Isolation of what? 100Hz, ripple, or RFI, or both?
As for RFI, it is present on the 'ground' wire as well as on the (+) wire. Why not double CCS, one on the incoming (-) wire and one on the incoming (+) wire?
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Old 13th March 2013, 05:48 PM   #3820
iko is offline iko  Canada
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Think of the ccs as a very very large value resistor, but without the large voltage drop. The better the ccs in that position the better will the shunt portion work to give you in the same time low output impedance AND very good line noise rejection. This particular CCS gives you really good performance in the lower frequency range, and quite good going up in frequency.

A resistor instead of the ccs works technically but very bad at doing the tasks above.

Makes no sense to put a ccs on the ground/return wire.
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