The simplistic Salas low voltage shunt regulator - Page 49 - diyAudio
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Old 12th June 2009, 01:31 PM   #481
Salas is offline Salas  Greece
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Quote:
Originally posted by nicoch46
HI, is normal that shunt start at 44.20 and stabilized at 44.95 after 5/7min. for thermal effect , ie when out mosfet rich 51
Yes, with the sinks and power you use.
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Old 12th June 2009, 01:34 PM   #482
Salas is offline Salas  Greece
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Quote:
Originally posted by Tham
Hi Salas/Iko,

Found the problem...forgot to test it with smoothing caps before the input to the shunt regulator. It is working well already powering my RIAA pre and the noise floor is lower compared to the linear regulator I used earlier.

I used common components for my built. Is there any particular component(s) in the circuit that I could change to make it even better?

Many thanks for the great help.
Yes, change the Zener capacitor and output capacitor to something like Panasonic FC. The smoothing ones you initially forgot, what are they?
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Old 12th June 2009, 02:03 PM   #483
iko is offline iko  Canada
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Default Source for 2sk170

Guys, if you don't have a good source for the 2sk170bl, I would like to recommend the cheapest source I could find, which is Spencer
http://www.diyaudio.com/forums/showt...69#post1853069

I got two shipments from him already, and many others in the forum did too, all well. The 2sk170 are a great current source that can be used in other circuits as well (like the salas phono stage which is excellent).
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Old 12th June 2009, 03:27 PM   #484
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HI IKO

the zone near zener end up to 40 ,the body is at 45
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Old 12th June 2009, 04:26 PM   #485
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
Hi,
what power is the Zener dissipating ref. maximum power rating?
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Old 12th June 2009, 07:16 PM   #486
Salas is offline Salas  Greece
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300-400mW for a 1W part in nicoch case.
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Old 12th June 2009, 11:46 PM   #487
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t ambient is 28... better put some hole in the pcb

fak** toroid 65VA 40v, put out 57vdc with 400ma shunt current!!!
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Old 13th June 2009, 12:37 AM   #488
Salas is offline Salas  Greece
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Looks like you have a low regulation tough transformer, or your wall plug has somewhat more voltage than its designed for. It works safely as a whole amp for long enough to trust it for start I think.

How is Franky doing for sound by now it has burned a little? Are you happy with your investment in it?
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Old 13th June 2009, 12:57 AM   #489
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sound good
shunt do detail and clean...!!!

what not work so good is the separation on psu , I add a separate trafo for driver , I thinks that better single but separate the trafo for channel ,(ok four trafo is the best) with only all separate diode/caps I dont have gain on sound stage.....

stealth diode+ kg on pw stage and byv27+Kg super t. on driver is too much soft ,need to put some bypass...

Salas as on driver out there is some mox 1,5w -4,5w ,I thinks the kiwane can be better , as works good in my scanspeak better than mox , alternative mills or ?
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Old 13th June 2009, 01:06 AM   #490
Salas is offline Salas  Greece
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Mox I never liked. Mills gives audible difference. Kiwame little dark, but better than mox.
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