The simplistic Salas low voltage shunt regulator - Page 57

iko · 18th June 2009, 12:16 PM

Oooooh! I'd say between 40 and 49. Can you recommend smth?

Edit: I'm about to go for a v-strom ride in the rain, so... I'm looking forward to your answer when I'm there.

AndrewT · 18th June 2009, 12:19 PM

I just listened to the first few bars of "temptation" (Athens audiophile).

I don't have the original in any format, but I can tell you that the quality coming from disco speakers (15"+compression horn) is far better than YouTube can provide.

Why do you tubers think they can demonstrate Audio Quality via that medium?

Salas · 18th June 2009, 12:19 PM

Quote:

Originally posted by ikoflexer
Oooooh! I'd say between 40 and 49. Can you recommend smth?

Edit: I'm about to go for a v-strom ride in the rain, so... I'm looking forward to your answer when I'm there.

They say good words for the Elsinore and I guess its right for your space.

Salas · 18th June 2009, 12:23 PM

Quote:

Originally posted by AndrewT
I just listened to the first few bars of "temptation" (Athens audiophile).

I don't have the original in any format, but I can tell you that the quality coming from disco speakers (15"+compression horn) is far better than YouTube can provide.

Why do you tubers think they can demonstrate Audio Quality via that medium?

At least in that video it was something like a tribute to the dreamer audiophile. I have seen other videos though that a guy says ''here is my new speaker'' and others comment ''Good! I can say even from the video''. Just enthusiasm I guess.

nicoch58 · 18th June 2009, 01:27 PM

HI IKO my suggestion http://www.quarter-wave.com/Project08/Project08.html

iko · 18th June 2009, 01:41 PM

Elsinore?

Yeah, but then I have to build a serious power amp. You see how one can end up like those guys in the video? Slippery slope isn't it?

nico, I've been thinking about full range for some time, maybe.

Thanks guys!

jeepee · 18th June 2009, 02:00 PM

Hi Ikoflexer,

great to see you latest results. It's always ensuring when practice and theory are in line.
As you write it's fun to do this exercise and it extends our understanding.

I think you can even further simplify the remote sensing, by leaving J2 and J3 in the shunt part, on the left side ground/supply. These are merely current sources, so "should not have a notion of voltage". That way you only have 2 components (ZT and Q3) as the remote sense.

Elaborating further on the idea of having dedicated shunts for each circuit stage, you can just put multiple transistors for Q1. Currents will not be matching exact, but that's not important here, since the excess current is shunted anyway. So the amount of extra components is minimal, one extra Q1 per dedicated shunt stage. Combined with remote sensing, it can still be a modular/scalable design. For example make provision for 4 shunts, what's not needed you simply don't mount on the PCB.

I don't know if this brings some sonic value though, but just for the record.

How do you test stability? Do you use a transient step response and observe the ringing?

JP.

AndrewT · 18th June 2009, 02:04 PM

J2 & J3 are part of the measuring bridge.

They must be included in the bridge so that the output (error signal) can be the control signal for the shunt element.

Salas · 18th June 2009, 02:08 PM

Quote:

Originally posted by ikoflexer
Elsinore? Yeah, but then I have to build a serious power amp. You see how one can end up like those guys in the video? Slippery slope isn't it?

Just a couple of Hypex ready made modules and you are done.

nicoch58 · 18th June 2009, 02:14 PM

no digital please

thinks how can clean the bass from 18" in openbaffle and how big the soundstage of sweet jordan inOB
(or at last fostex as Iko like details

Salas update in your speakers project?

18th June 2009, 12:19 PM	#562
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	off topic I just listened to the first few bars of "temptation" (Athens audiophile). I don't have the original in any format, but I can tell you that the quality coming from disco speakers (15"+compression horn) is far better than YouTube can provide. Why do you tubers think they can demonstrate Audio Quality via that medium?

18th June 2009, 01:27 PM	#565
nicoch58 diyAudio Member Join Date: Oct 2004	HI IKO my suggestion http://www.quarter-wave.com/Project08/Project08.html __________________ Sic58

18th June 2009, 02:14 PM	#570
nicoch58 diyAudio Member Join Date: Oct 2004	no digital please thinks how can clean the bass from 18" in openbaffle and how big the soundstage of sweet jordan inOB (or at last fostex as Iko like details Salas update in your speakers project? __________________ Sic58

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18th June 2009, 12:16 PM	#561
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	Oooooh! I'd say between 40 and 49. Can you recommend smth? Edit: I'm about to go for a v-strom ride in the rain, so... I'm looking forward to your answer when I'm there.

18th June 2009, 01:41 PM	#566
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	Elsinore? Yeah, but then I have to build a serious power amp. You see how one can end up like those guys in the video? Slippery slope isn't it? nico, I've been thinking about full range for some time, maybe. Thanks guys!

18th June 2009, 02:00 PM	#567
jeepee diyAudio Member Join Date: Apr 2009	Hi Ikoflexer, great to see you latest results. It's always ensuring when practice and theory are in line. As you write it's fun to do this exercise and it extends our understanding. I think you can even further simplify the remote sensing, by leaving J2 and J3 in the shunt part, on the left side ground/supply. These are merely current sources, so "should not have a notion of voltage". That way you only have 2 components (ZT and Q3) as the remote sense. Elaborating further on the idea of having dedicated shunts for each circuit stage, you can just put multiple transistors for Q1. Currents will not be matching exact, but that's not important here, since the excess current is shunted anyway. So the amount of extra components is minimal, one extra Q1 per dedicated shunt stage. Combined with remote sensing, it can still be a modular/scalable design. For example make provision for 4 shunts, what's not needed you simply don't mount on the PCB. I don't know if this brings some sonic value though, but just for the record. How do you test stability? Do you use a transient step response and observe the ringing? JP.

18th June 2009, 02:04 PM	#568
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	J2 & J3 are part of the measuring bridge. They must be included in the bridge so that the output (error signal) can be the control signal for the shunt element.