Can we start to put values on this nice supply schematic?
It would be a nice addition to my PhonoClone phono preamp.😀
It would be a nice addition to my PhonoClone phono preamp.😀
Hello Richard,
You’ll find a number of shunt regulator designs on diyaudio, though most are using feedback. I am not saying that they are better than your design, but they might be good for comparison. Here is another Op-Amp based regulator: http://www.euronet.nl/~aespreng/Shuntregv11d/. There was also a nice design from Manuel Huber with a discrete Opamp. It was for a tube supply but could be adapted for lower voltages. It’s no longer online but I have a copy, in case you are interested.
Btw, Jan Didden posted a LM317 shuntreg schematic recently, for those who want two LM317 in the supply (CCS followed by the shuntreg). I trust that the LM317 works in this configuration
(I am going to find out soon …).One question on your grounding scheme: If you have two separate bridges already would it not be better to keep the ground runs separate and only connet to a starground once, near the amplifyer circuit?
Hello,
Since always, I tried to provide to my circuits the best current and the best tension.
For it, I tried many designs of power supply, solid state, vacuum tubes, regulated, stabilized, with very great caps, of Jung type, …
I have, of course, tried various batteries also, with more or less of success, because of problems of load and discharge, even of smell for batteries of cars.
I have always dreamed of a AC power supply with qualities of batteries.
I made of long and of numerous search for, I read a lot of articles of John Curl, of regretted Bob Crump, of Charles Hansen and good of other audio designers, on this topic.
One day, I read an article where John Curl said:
""" The goal is to emulate the virtues of a battery power supply ""
Also, today, I propose you this schematic what is the result of all my readings and, a little, de my experience. It seems to me that it is isolated well to AC windings.
It functions correctly but, only John Curl and God or God and John Curl, can say if it has all qualities of a battery. LOL
A big thank you again to John Curl for all information that he wanted to give.
Regards
Darry
Since always, I tried to provide to my circuits the best current and the best tension.
For it, I tried many designs of power supply, solid state, vacuum tubes, regulated, stabilized, with very great caps, of Jung type, …
I have, of course, tried various batteries also, with more or less of success, because of problems of load and discharge, even of smell for batteries of cars.
I have always dreamed of a AC power supply with qualities of batteries.
I made of long and of numerous search for, I read a lot of articles of John Curl, of regretted Bob Crump, of Charles Hansen and good of other audio designers, on this topic.
One day, I read an article where John Curl said:
""" The goal is to emulate the virtues of a battery power supply ""
Also, today, I propose you this schematic what is the result of all my readings and, a little, de my experience. It seems to me that it is isolated well to AC windings.
It functions correctly but, only John Curl and God or God and John Curl, can say if it has all qualities of a battery. LOL
A big thank you again to John Curl for all information that he wanted to give.
Regards
Darry
Re: Shaft Extendeds needed here
I like this idea very much, especially for premium designs.
Panelhead said:
I like this idea very much, especially for premium designs.
I read these latest inputs with some confusion. I think that Darry's circuit is pretty darn good, and very close to what I do. In fact, the left half is almost exactly what my schematic looks like, including the input power cap configuration.
As far as shaft extenders go, they can be a good choice. We are using them in the Parasound JC-2 preamp that was first introduced at the CES show to extend the pot shafts.
I don't know what to say about switched grounds, but they could be a good idea.
As far as shaft extenders go, they can be a good choice. We are using them in the Parasound JC-2 preamp that was first introduced at the CES show to extend the pot shafts.
I don't know what to say about switched grounds, but they could be a good idea.
I would guess that suspending those heavy switches and pots in mid-air over the line amps would have cut down some wiring.
Welcome back John. Not sure how audible some of this stuff really is, but I always like to read what you say about noise and JFETs.
john curl said:
http://www1.jaycarelectronics.co.uk...&pageNumber=&priceMin=&priceMax=&SUBCATID=410
There is much better than this plastic thing, but you get the idea.
carlosfm said:
If you take the effort to switch the grounds, would'nt you want a 4-pole switch so you don't have to join the grounds at the switch? I guess it depends a bit on how the rest of circuitry looks, though.
Or perhaps I didn't get the idea? 🙂
Darry,
what is the benefit of using complementary series regulators in your circuit, that is, using regulators also on the ground rail? I have a few speculations, but none that seems more plausible than any other.
what is the benefit of using complementary series regulators in your circuit, that is, using regulators also on the ground rail? I have a few speculations, but none that seems more plausible than any other.
Christer said:
No, you didn't get the idea.
You use 3 pins for each input, on the outer side of the switch (signal left, right, and ground).
Then you use the central pins for the output: left, right and ground.
Easy.
This is like as if you had only one input on your pre: nothing gets mixed, not even the grounds.
carlosfm said:
Maybe I still don't get the point, or I was unclear. What I meant was that you have to join the left and right channel grounds, not the grounds for different sources. If you use a 4-pole switch you can switch also the grounds separately for left and right channel. Maybe doesn't matter much, but if we are switching grounds we are striving for perfection, so why not go all the way?
Christer said:
Ah, right.
Well, unless I have independent PSUs per channel, I would join the channel grounds right across each RCA pair, so only one ground wire comes to the switch.
To keep everything separated a 4 pole switch is needed.
Christer said:
If you use a precision voltage regulator with an output of 0.00V
to make your GROUND, you can be sure GND is at 0 Volt.
All the time.
Otherwise, without regulation,
if you are unlucky,
GROUND may be whatever voltage.
carlosfm said:
Then we agree. Yes, It probably doesn't matter much unless it is true dual mono, but in some cases it might introduce some extra ground loop (I think).
lineup said:
But note that the secondaries are floating, so if you join them at the ground point directly or via regulators shouldn't matter from that point of view, as far as I can see. I was rather speculating whether the point could be to make the load similar on both rail and gorund to make the common mode filter work better?
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