Simplistic Mosfet HV Shunt Regs - Page 209 - diyAudio
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Old 4th December 2011, 07:19 PM   #2081
vgeorge is offline vgeorge  Greece
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No, I do not use parafeed. It is wired 4.5:1 as output transformer. Inductance is more than 200H on the primary.
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Old 4th December 2011, 08:24 PM   #2082
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Thank you Nick

Quote:
Originally Posted by merlin el mago View Post
SSHV2 B.O.M.

Q1-2 DN2450 3.8W/C
Q3 IRF840 1W/C-1.5W/C
Q4-5 KSA1381 16W/C-80W/C
Q6 2SK117GR 3-5mA Idss, 4mA center value

D1-2-3 Z12V 0.5W
D4 LED red led, typically 1.9Vf

R1-2 100R 1/4W
R3 330R 1/4W
VR4 500R
R5 10R 1/4W
R6 1R86 1/4W
R7 100R 1/4W
R8 1K 1/4W
R9-10 68K 2W
VR11 500R
R12 1K 1/4W


C1 0.33uF 400V
C2 10uF400V
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Old 4th December 2011, 08:41 PM   #2083
Salas is offline Salas  Greece
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Board is 136X49mm I forgot to write. I have seen for capacitors it can also take axial like SCR or some REL-CAP too.
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Old 4th December 2011, 09:35 PM   #2084
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@Salas - could you please suggest any less exotic substitute for KSA1381? I can't find this transistor neither in Elfa nor in Farnell. Wher do you buy it (EU countries preffered).
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Old 4th December 2011, 09:56 PM   #2085
Salas is offline Salas  Greece
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I had already in my text. MJE350 has been tested with success. Not as perfect result but rather near.
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Old 4th December 2011, 10:04 PM   #2086
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Thanks for quick reply
Two more question - if I compare this project with yours previous one very visible is that only Q1 is currently on bigger (not even quite big) heatsink ( I am talking about your project of PCB). In previous version much bigger heatsinks used to be applied. What is the reason? Does it mean that Q1 dispatch the most power and only for Q1 the serious heatsink is required?
Do I understand rightly that S+/S0 is sensing circuit and F+/F0 is current output? If so, does it means that I can connect them parallel if i am not going to use sensing circuit?
Best Regards,
WW
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Old 5th December 2011, 04:18 AM   #2087
Salas is offline Salas  Greece
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Yes, Q1 takes the most in CCS. In post #2061 those things are discussed, including answer to your skip sensing question.
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Old 5th December 2011, 09:17 AM   #2088
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Hi Salas. I am going to make new vercion of shunt reg. to power a stereo tube preamp. (2x 6N1P). The in V is about 330V the B+ of pream. is 260V. In order to drop down 330V, I am thinking to add two 2K2 resistors after 330V and 2 or 3 100μF/400V electr. cap and 2 or 3 1μF/400V polyester cap (for filter) and after that the shunt reg. in the same pcb. Also I'l join F+ and S+ - F0, S0. Any advice about that?
Thanks Dade
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Old 5th December 2011, 07:19 PM   #2089
Salas is offline Salas  Greece
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To use up voltage for pre filtering instead of burning it out across the CCS is better. It would be optimum if you could retain the 4 wires up to the load connection point, by adding a secondary sense line. If impossible in an existing build, OK.
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Old 5th December 2011, 08:40 PM   #2090
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Thank yoy Salas. So I use the prefilter to drop down the 330V is OK. I'l feed the Anode of the tube whith 260V from F+ of CCS. At the same point I'l conect the S+ in order to corect the tence if drop down or go up if I use long wires. Is that OK?
Can I replace 10μF MKP cap. whith elecrolytic and add // 2,2 μF ?
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