Simplistic Mosfet HV Shunt Regs - Page 208 - diyAudio
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Old 4th December 2011, 12:50 PM   #2071
vgeorge is offline vgeorge  Greece
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Salas sent me the new schematic some time ago and told me if I had time to test his new circuit. He knew I am using a 26 pre, so I needed around vin 180 and vout 140v out from the regulator. I jumped on it and finished it the next day. Initially I did not give much attention to layout, but it worked right away. I liked that I could adjust current on the fly. During testing it seemed much more stable than SSHV1. Voltage drift was only a few volts after warm up, and then it stays were you adjust it.
I tested it with mje350 initially and it worked fine. When later got the ksa1381 no problems again. Also made a version with vin 330v and vout 300v just to see that there is no problem with it.
Comparing with the first SSHV sound is much better. More definition and more liquid sound I could say. Initial impression was that I got more information on the bass region. Also changing to ksa1381 made a difference.
I attach a picture of my final built. When Salas told me I could do better on the layout, I dismantled both shunts (yes, I built two initially) and rebuilt them!
Attached Images
File Type: jpg IMG_1015.JPG (183.8 KB, 1100 views)

Last edited by vgeorge; 4th December 2011 at 01:06 PM.
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Old 4th December 2011, 02:19 PM   #2072
vgeorge is offline vgeorge  Greece
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I forgot to mention that my 26 pre has ll1660pp output transformers and SSHV2 is feeding them. There is absolutely no noise or anything on 100db speakers. I really think that this is a worthwhile upgrade from SSHV1 on reliability, ease of construction and especially sound.
Also when tested at more than 300v the ksa1381 were not getting very warm. I do not thin that they need any sinking, but that could change if in a box. But then it' s easy to add simple clip on heatsink if necessary.
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Old 4th December 2011, 04:24 PM   #2073
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Default SSHV2

SSHV2 B.O.M.

Q1-2 DN2450
Q3 IRF840
Q4-5 KSA1381
Q6 2SK117GR
IDSS? HEATSINKS FOR IRF840 & MINI-HEATSINKS FOR KSA1381?

D1-2-3 Z12V 0.5W
D4 LED VALUE?

R1-2 100R
R3 330R
VR4 500R
R5 10R
R6 1R86
R7 100R
R8 1K
R9-10 68K 2W
VR11 500R
R12 1K

C1 0.33uF
C2 10uF
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Old 4th December 2011, 04:40 PM   #2074
Tea-Bag is offline Tea-Bag  United States
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Mouser #: 512-KSA1381ESTU
Mfr. #: KSA1381ESTU
Manufacturer: Fairchild Semiconductor
Desc.: Bipolar Small Signal PNP Si Transistor Epitaxial
RoHS: RoHS Compliant




Mouser #: 689-DN2540N5-G
Mfr. #: DN2540N5-G
Manufacturer: Supertex
Desc.: MOSFET 400V 25Ohm
RoHS: RoHS Compliant




Q1 Heatsink. Can go smaller or larger with 657 line.

Mouser #: 567-657-20ABP
Mfr. #: 657-20ABP
Manufacturer: Wakefield
Desc.: Heat Sinks TO-220 W/PINS BLK 2

Last edited by Tea-Bag; 4th December 2011 at 04:57 PM.
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Old 4th December 2011, 05:12 PM   #2075
Salas is online now Salas  Greece
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Quote:
Originally Posted by regal View Post
If using a CCS I would imagine that would mitigate any of the issues around driving an inductive load at higher currents ?
Can't guess, its a system thing you got to test. Does not strike me as odd at least.
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Old 4th December 2011, 06:13 PM   #2076
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Hi Salas,
Congratulations.
What is the minimum CCS current draw, recommended for best results?
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Old 4th December 2011, 06:17 PM   #2077
Salas is online now Salas  Greece
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Same as in previous SSHV. 20mA left to the reg itself.
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Old 4th December 2011, 06:34 PM   #2078
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Thanks.
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Old 4th December 2011, 06:37 PM   #2079
Salas is online now Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
Q6 2SK117GR
IDSS? HEATSINKS FOR IRF840 & MINI-HEATSINKS FOR KSA1381?

D1-2-3 Z12V 0.5W
D4 LED VALUE?
3-5mA IDSS like in BIB, 4mA center value. Any red led, typically 1.9Vf.
Heatsink for IRF840 depends on each one's application dissipation. Would use 1W/C-1.5W/C if with 10W heat for example. The board lends it self to be fixed parallel to it like an amp module. Or to sink along the edge ''L'' style. For CCS heatsink see Wakefield 1inch footprint 647 series. For KSA see for minis and clip ons 12-15mm wide. Examples Your Search Results | Farnell United Kingdom | Results C1,C2 MKP 400V of course.
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Old 4th December 2011, 07:08 PM   #2080
regal is offline regal  United States
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Quote:
Originally Posted by vgeorge View Post
I forgot to mention that my 26 pre has ll1660pp output transformers and SSHV2 is feeding them. There is absolutely no noise or anything on 100db speakers. I really think that this is a worthwhile upgrade from SSHV1 on reliability, ease of construction and especially sound.
Also when tested at more than 300v the ksa1381 were not getting very warm. I do not thin that they need any sinking, but that could change if in a box. But then it' s easy to add simple clip on heatsink if necessary.
I think those have very high inductive primaries, and you are parafeed with a CCS or choke? Somewhat similiar to what I am planning.
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