Simplistic Mosfet HV Shunt Regs - Page 285 - diyAudio
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Old 8th April 2012, 04:18 PM   #2841
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Quote:
Originally Posted by merlin el mago View Post
Attached my finisfed SSHV2, heatsink IRF840 1C/W isolated from chassis with bitumen car dampers self-adhesive, heatsink DN2450 4,5C/W, for caps I used the ones I have on my stash: 10uF 400V Solen & 0,33uF 425V Infinicap Wonder Signature TRT, resistors & semis are from Mike (aka Tea-Bag) minikits
I notice you didn't use a small heat sink on Q4 & 5, is it ok?
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Old 8th April 2012, 06:09 PM   #2842
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Quote:
Originally Posted by merlin el mago View Post
Attached my finisfed SSHV2, heatsink IRF840 1C/W isolated from chassis with bitumen car dampers self-adhesive, heatsink DN2450 4,5C/W, for caps I used the ones I have on my stash: 10uF 400V Solen & 0,33uF 425V Infinicap Wonder Signature TRT, resistors & semis are from Mike (aka Tea-Bag) minikits
Did you test it? What Vin Vout and current did you use?
Regarding sinking Q4 and Q5, it is necessary above 300v or so.
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Old 9th April 2012, 12:22 PM   #2843
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Vin 284V, my Vout target 240V, my current target 60mA but can't turning R4, the minimum current that I reach is 171mA.

I have two separate boxes(one for PSU & the other for the RIAA), I need to put one cap near the input regulator, if yes wich value?

Last edited by merlin el mago; 9th April 2012 at 12:37 PM.
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Old 9th April 2012, 01:03 PM   #2844
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My PSU it's CL only have one cap 220uF 450V & one choke 10H.

I have BG 150uF 350V & Nichicon KX 220uF 450V to put near the input reg. it's Ok the value or I need other small value?
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Old 9th April 2012, 01:05 PM   #2845
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Its OK to put very near the reg's input.
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Old 9th April 2012, 01:12 PM   #2846
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Quote:
Originally Posted by merlin el mago View Post
Vin 284V, my Vout target 240V, my current target 60mA but can't turning R4, the minimum current that I reach is 171mA.

I have two separate boxes(one for PSU & the other for the RIAA), I need to put one cap near the input regulator, if yes wich value?
My fault I have 17mA instead 171mA

Now 600mV across TP but only reach 15Vout with R11.

Heatsink DN2450 is very very hot. Heatsink IRF840 is cold with 1C/W

Last edited by merlin el mago; 9th April 2012 at 01:29 PM.
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Old 9th April 2012, 02:21 PM   #2847
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Quote:
Originally Posted by gmant123 View Post
Sorry for my typo in fact is irfp9240...

In this schematics take out D4 and D5, other changes are needed?

Simplistic Mosfet HV Shunt Regs

Thanks.

Alberto.
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Old 9th April 2012, 02:24 PM   #2848
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Quote:
Originally Posted by merlin el mago View Post
My fault I have 17mA instead 171mA

Now 600mV across TP but only reach 15Vout with R11.

Heatsink DN2450 is very very hot. Heatsink IRF840 is cold with 1C/W
Is your dummy light enough not to ask more than 40mA at 240V?
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Old 9th April 2012, 02:25 PM   #2849
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What dummy load did you use?
Does voltage go up when you reduce the current?
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Old 9th April 2012, 02:34 PM   #2850
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Quote:
Originally Posted by Salas View Post
Is your dummy light enough not to ask more than 40mA at 240V?
Quote:
Originally Posted by vgeorge View Post
What dummy load did you use?
Does voltage go up when you reduce the current?
With the other SSHV reg I used 240V 60mA & the Puresound was sounding OK

I didn't used dummy load I use the MM as the real load.

Yes when I reduce the current the voltage goes up.
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