The simplistic Salas low voltage shunt regulator - Page 50 - diyAudio
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Old 13th June 2009, 01:42 AM   #491
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Nico,
Try substituting the BYW29s for the Stealth diodes, maybe change up the Kgs for F&Ts, Mundorfs, etc and perhaps see about changing the wire, too.
Sounds a bit crazy but it's quite surprising how these small things add up - an R-C-R-C arrangement, the simple Haggerman snubbers, good wire, cool diodes, reistors, etc
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Old 13th June 2009, 01:50 AM   #492
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thanks !

Or new Salas shunt for pwstage
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Old 13th June 2009, 02:17 AM   #493
Tham is offline Tham  Malaysia
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Hi Salas,

The smoothing caps are just two 1000uF Rubycon YXA bypassed with a small polystyrene cap that I have on hand.
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Old 13th June 2009, 02:56 AM   #494
Salas is online now Salas  Greece
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You can go up to 10.000uF. Panasonic TS-HA are good value.
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Old 13th June 2009, 03:01 AM   #495
Tham is offline Tham  Malaysia
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Thanks. Will try that later.
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Old 13th June 2009, 03:34 AM   #496
iko is offline iko  Canada
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Quote:
Originally posted by nicoch46
t ambient is 28... better put some hole in the pcb

fak** toroid 65VA 40v, put out 57vdc with 400ma shunt current!!!

are you dissipating over 20W just in the shunt?
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Old 13th June 2009, 08:51 AM   #497
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by nicoch46
the zone near zener end up to 40 ,the body is at 45
Quote:
Originally posted by AndrewT
what power is the Zener dissipating ref. maximum power rating?
Quote:
Originally posted by Salas
300-400mW for a 1W part in nicoch case.
try reducing the current through the Zener to get dissipation down to ~100mW.
Or change the Zener to a 400mW type and reduce dissipation to ~50mW.
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Old 13th June 2009, 03:15 PM   #498
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iko I have four shunt at 100ma , 2x +/-
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Old 15th June 2009, 03:38 AM   #499
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Quote:
Originally posted by Salas
We also need to thank James for his PCB efforts.
Here is his latest refinement for V1. He has included every possible nut n' bolt. LEDs CCS, Vbe CCS, positive / negative shunt, Zener socket for changing Vout in a sec, clean, compact, star layout. I did not see anything wrong by looking at it, you may have your second look too. James is more suitable to comment on the options and how to implement them I guess. He has also made a few V1s (not in WWII) and maybe he can convey his experiences and applications if he likes to.

James/Salas,

First off the layout of this board is stunningly elegant. Just fantastic! Is this compatible with the schematic in post 1, which I believe is V1 with the R6 Mod?

Click the image to open in full size.
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Old 15th June 2009, 04:08 AM   #500
Tham is offline Tham  Malaysia
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Hi Iko,

Will try the version in post #456...for18Vdc output, do I change both the zeners to 18V diode? Any other changes need to be made?
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