The super regulator as it was presented had limited data because of the design but nothing says that it can be done for any voltage and any current but if the requirements are more than 36 volts out and 1.5 A (1 A in real life) a redesign is necessary. There are a half dozen of avaible pcb's out there. The latest one comes from Taiwan but this one and noone else is rather well suited for higher power.
My idea was to design a regulator for
* 5-100 V out, 3 A min
* Normal 36 volts opamps, speed goal AD825 without oscillations
* LM431, LM329 and similar references
* LM338 preregulator, maybe
* Overvoltage protection for the LM338 and SR
* Short circuit protection (more advanced than usual, low loss)
* Maybe rectifier bridge and smoothing on the same pcb
* Fuse for incoming power
* Hole mounted parts mainly but possible to use SO08 opamps also
* Nice looking pcb
* Mainly "normal" parts, high industrial quality
Time frame: First half of 2006
At the moment I haven't dived into possible design problems concerning using opamps with less supply voltage than the output voltage.
I may drive this project according to my group buy guide lines.
How do you think it sounds?
My idea was to design a regulator for
* 5-100 V out, 3 A min
* Normal 36 volts opamps, speed goal AD825 without oscillations
* LM431, LM329 and similar references
* LM338 preregulator, maybe
* Overvoltage protection for the LM338 and SR
* Short circuit protection (more advanced than usual, low loss)
* Maybe rectifier bridge and smoothing on the same pcb
* Fuse for incoming power
* Hole mounted parts mainly but possible to use SO08 opamps also
* Nice looking pcb
* Mainly "normal" parts, high industrial quality
Time frame: First half of 2006
At the moment I haven't dived into possible design problems concerning using opamps with less supply voltage than the output voltage.
I may drive this project according to my group buy guide lines.
How do you think it sounds?
i think you overstate the difficulty of building a hv regulator -- if it's opamp based you lift the "4" pin off the ground with a zener diode, protect the inputs with clamp diodes, etc., etc. use higher voltage components -- take a look at the Audio Research SP-10 which uses localized HV regulators for the phono and amplification stages.
in hv you are dealing with necessarily noisy thermionic devices anyway...
jack
in hv you are dealing with necessarily noisy thermionic devices anyway...
jack
analog_sa said:
http://www.tubecad.com/2005/January/blog0031.htm
I actually think a 300V tube version is quite easy to make. I am working on a 2000VDC shunt reg using the same circuit.
Attachments
The Jung regulator is way more sophisticated than the SP-10. It would be great if it becomes available as a high quality PCB suitable for high voltage as similarly to an SP-10 i feel each stage should get it's own regulator.
I am currently using something similar with good results. Still, building 6 of these critters may become a bit tiresome.
Making a wideband device which I plan the regulator to be is not easy. Compare our Taiwanese friend which has made a nice looking pcb but it's impossible to get it stable with AD825. He has made a minor error about the grounding and the bandwidth is heavily reduced. This may not be a problem if bandwidth wasn't the issue.jackinnj said:
So it may be easy, it may also be difficult....
peranders said:
Well high-current is probably going a bit too far.
But I have long wanted to try a super-regulator design with a Class-D amplifier. The problem has been that I don't want it to be terribly current limited and the 1-1.5A that most designs allow is just too low for me to be comfortable with. (Especially because I'd rather not be pushing the circuits tolerances). As far as voltage goes, you can do a lot with 20v (or 12!) in class-D so it isn't really a concern for me.So perhaps a better wording would be "higher than normal" currents.
PA:
I don't think that the super-reg design, in its unvarnished form, is appropriate for an HV supply -- it can oscillate if you don't compensate the feedback loop -- this was pointed out in the Audio Amateur articles and subsequent suggestions by Jung and others.
Any HV reg design should be vetted with a loop stability test.
I don't think that the super-reg design, in its unvarnished form, is appropriate for an HV supply -- it can oscillate if you don't compensate the feedback loop -- this was pointed out in the Audio Amateur articles and subsequent suggestions by Jung and others.
Any HV reg design should be vetted with a loop stability test.
P-A,
I need a version of this that will output + - 24VDC for a mic pre I'm working on. Each module consumes between 50-100ma. Is it stable enough for pro recording applications? What about using the LT-1085/1033 as the first stage regulators instead of the generic 317/337? Cost? I didn't see a GB price listed. Thanks.
Mike Morgan
I need a version of this that will output + - 24VDC for a mic pre I'm working on. Each module consumes between 50-100ma. Is it stable enough for pro recording applications? What about using the LT-1085/1033 as the first stage regulators instead of the generic 317/337? Cost? I didn't see a GB price listed. Thanks.
Mike Morgan
If you want 24 volts there is no problem. The problem is more voltage out than the opamp can handle which is 36 volts or more.
50-100 mA, 24 volts, is no problem with the designs I already have.
Using a better regulator than the LM317 doesn't improve much because the major job is done by the super regulator but if it fits sure you can have other types.
This project hasn't reach the stadium of being a group buy. Now it's just checking the interest.
50-100 mA, 24 volts, is no problem with the designs I already have.
Using a better regulator than the LM317 doesn't improve much because the major job is done by the super regulator but if it fits sure you can have other types.
This project hasn't reach the stadium of being a group buy. Now it's just checking the interest.
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