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Old 3rd May 2012, 10:46 AM   #2961
Salas is offline Salas  Greece
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Try 2R which is near and see if its stable with your load.
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Old 3rd May 2012, 01:02 PM   #2962
CSlee is offline CSlee  United Kingdom
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I think i'll pick up some 1R8 when I can just in case. Thanks for your help, it's important I understand all the circuit or there's not much point building it!

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Old 3rd May 2012, 01:07 PM   #2963
Salas is offline Salas  Greece
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Remember that termination can be upset if shunted by capacitance on load's rail to gnd. In such a case, either delete non essential add on caps or buffer them with some resistance to render them into an RC filtering cell effectively.
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Old 3rd May 2012, 04:31 PM   #2964
AndrewT is offline AndrewT  Scotland
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2r0//18r = 1r8
2r2//10r ~1r8
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Old 6th May 2012, 02:44 PM   #2965
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Default Capacitors c1,c2 sshv2

Hi.
Which ones should be better for c1,c2(especially c2):
SOLEN 10uf / 400VDC, PB Series
MUNDORF 10uf / 400V, M-CAP® MKP
Obbligato 10uF / 630V, Premium Gold Film Cap
Obbligato 10uF / 630V, Film Oil Cap
Thank you.
Darek.
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Old 6th May 2012, 02:57 PM   #2966
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Default Shunt regs

I have never designed a shunt reg in my life if excluding zerers . To be honest it looks too good to be true that it has advantages . I would guess a slow transistor not especially wrong for a shunt if a capacitor backs it up . I have no idea and I am asking . I did do up a Chinese amp that had many of them . I can not claim it as my work . It did sound very good . It had a relay volume control using fixed resistors . The circuit resembled Naim .

Is there any need for speed ?
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Old 6th May 2012, 04:35 PM   #2967
AndrewT is offline AndrewT  Scotland
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the speed determines the maximum frequency the shunt reg can attenuate.
A very low frequency shunt circuit will be reasonably good at attenuating mains hum. A faster circuit will be good at attenuating mains buzz and LF noise.
A fast circuit will attenuate medium frequency noise, maybe even the noise below 20kHz.
A very fast shunt will attenuate high frequency noise, maybe to beyond 1MHz.
That's where the simulator shows when the output impedance is rising. When the attenuation of the HF noise is not so good.

If that paragraph is correct, then it follows that a very fast shunt is capable of attenuating more noise than any of the slower circuits.
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Old 6th May 2012, 04:38 PM   #2968
CBS240 is offline CBS240  United States
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I agree. My experience seems to show this trend is true of series regs as well.
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Last edited by CBS240; 6th May 2012 at 04:44 PM.
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Old 6th May 2012, 04:57 PM   #2969
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Quote:
Originally Posted by dbratny View Post
Hi.
Which ones should be better for c1,c2(especially c2):
SOLEN 10uf / 400VDC, PB Series
MUNDORF 10uf / 400V, M-CAP® MKP
Obbligato 10uF / 630V, Premium Gold Film Cap
Obbligato 10uF / 630V, Film Oil Cap
Thank you.
Darek.
For me the best MKP is Auricap
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Old 6th May 2012, 04:58 PM   #2970
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Default That's clear

Thanks Andrew . That makes perfect sense and never occurred to me . I guess shunt is a bit better than series as nothing is passing through an amplifying device directly between capacitor and amp lets say . My guess is two equally engineered series or shunt regulators would be nearly the same ? The difference being series is in fact a power amplifier swinging with the signal . The shunt also in a different way . Very hard to sum up I would say .

I would think shunt better if forced to use a slower transistor as it can be bolstered by the output cap ( e.g. 2N3055 ) . I suppose that holds for series also . The little power amp bobbing up and down of the series is not so appealing to my mind . LM317 for example can be turned into an amplifier .
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