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Old 25th November 2012, 11:05 PM   #1941
Salas is offline Salas  Greece
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Different Mosfet Vgs from sample to sample and/or less total Vf from Leds, samples vary also, even if matched the Jfet that runs them could be less for idss in one board. In one word: Tolerances.
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Old 25th November 2012, 11:20 PM   #1942
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Thanks Salas.


lessons learned:

Next time, I'll build, measure, then order the correct R's. Can't rely on theoretical specs for this. For some reason, I had spec'd the V at 2.3 from spreadsheet so I had those 3.9r for about ccs 600ma

In essence, I need to order 1.2 and 1.55 r to get .600 from both bibs.

so 2x2.4r and 2x3.1r in 5W

.72/600 = 1.2
.93/600=1.55


thanks all for support
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Old 25th November 2012, 11:27 PM   #1943
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question:

has anyone used caddock 30w at these positions?

I have plenty of sinking for them.
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Old 25th November 2012, 11:29 PM   #1944
Salas is offline Salas  Greece
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...Or simply sub a stronger LED that will make up for the difference, or, or...
The calc makes some assumptions, but if you will feed it your measured LEDs total Vf and specific Mosfet's VGS it will guess better. This is not a very easy to grasp initially reg for its inner works and fine points, its very individual. Using passive voltage reference with no local feedback loop holding its value even...But it pays in tone I hope. That part was the focus of the design.
Some pictures after you are finished are always welcome to the shunt family album.
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Old 25th November 2012, 11:30 PM   #1945
Salas is offline Salas  Greece
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Quote:
Originally Posted by necplusultra View Post
question:

has anyone used caddock 30w at these positions?

I have plenty of sinking for them.
MP930s are said to be the dog's...ears in this
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Old 26th November 2012, 07:02 AM   #1946
pchw is offline pchw  United States
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Quote:
Originally Posted by Salas View Post
Chinese MKT like those used in speaker kits maybe.
Yup, these are MKT made by Taiwanese manufacturer Carli and are commonly used in XO projects. $1.80ea at Madisound
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Old 26th November 2012, 07:09 AM   #1947
qusp is offline qusp  Australia
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Quote:
Originally Posted by Salas View Post
MP930s are said to be the dog's...ears in this
tx220S (S-Foil power resistors) arent bad either =) gotta love surplus cleanups around here. bagged a bunch of these including some 4.7R and 10R, perfect for salas regs with a little heatsink. with teflon cap, makes for a stupidly OTT shunt reg
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Old 26th November 2012, 10:48 AM   #1948
ryanj is offline ryanj  Australia
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Default SSLV1.1 powering TDA1541A

Improvement in sound with these regs is quite a step up. Happy with the stability so far; DC coupling to my power amp has been quite a juggling act but ive enjoyed the challenge. Hi-res picture attached.
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File Type: jpg IMGP6176.jpg (826.6 KB, 185 views)
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Old 26th November 2012, 10:50 AM   #1949
Salas is offline Salas  Greece
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Nice. What is the config you supply exactly?
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Old 26th November 2012, 10:59 AM   #1950
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I am looking for a cheap but good quality MKP caps to replace shunt electrolytic capacitors at speaker crossover - at mid and woofer shunt position
I have made a test replacing only one mid speaker shunt electrolytic cap of 22uF with four Bennik XPP 5,6 uF and It bring Improvement
now I need a recommendation for a other values 100uF and 68uF and 150uF
anyone tryed erse MKP
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