High voltage, high current super regulator, possible group buy

[blip1882]

Originally posted by peranders
What is your application for "high current"?

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.

[peranders]

You maybe missed my specifications. You want less tan 36 volts so nothing is stopping you from from using an existing design. Do you know have a existing class D amp? Personally I think a class D amp should have a unstablised power supply.

[jackinnj]

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.

[peranders]

I only made 100 V as a possible target, more than 36 volts at least.

[tenor39]

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

[peranders]

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.

[tenor39]

P-A,

Thanks for the reply. I checked out your website and may order from there. Have you tried Gary Galo's common mode choke in the raw supply? I usually build mine that way, with a small value (10uF) PP cap after the rectifiers, then into the CM choke, then a large electrolytic.

Mike

[peranders]

Originally posted by tenor39
Have you tried Gary Galo's common mode choke in the raw supply?

No, any link?

[tenor39]

It was in a few issues of Audio Amatuer (now audioXpress) during the '90's. I have the issues, but I need to find the correct ones. I'll let you know.

Mike

[tenor39]

P-A,

Here is the Gary Galo/Rick Miller raw supply with some added refinements by me. It should enhance the performance of your Super Reg even more.