Convert AC Power Supply to DC?

[michaywood]

me and google have been friends for a while, and I just stumbled across this. Take a look: AC/DC power supply: voltage rectifier for LED lighting with built-in PFC - 20 - 96 W, IP64 | PLN, HLN series - Mean Well

To my non-electrician mind, that looks like it would do the trick! Right?

[52 Bill]

I don't think so, it takes an ac input voltage and outputs a dc voltage at a constant current to power led lighting systems. Why don't you find someone local to you that can build what you want from the schematic that Juan created for you.

Best of luck with your search.

[R.G.]

There are subtle problems lurking here. And at least one not-so-subtle one.

If you accidentally plug that 9Vac adapter into a socket that thinks it's supposed to get 9Vdc like many pedals, it can fry the whole pedal, even if it's nominally reverse polarity protected. "Fry" as in "leave a charred area on the PCB, and all semiconductors dead". I've seen it. This is the not-so-subtle problem. It's worse if you plug your 9Vac adapter into a daisy chain feeding a lot of 9Vdc pedals. Then they all get to fry at the same time. Ugliness abounds.

Some of the subtle issues have to deal with what the 9Vac pedal does with its 9Vac. It may feed (1) it right into a full wave rectifier bridge, and make a floating 11-14Vdc out of it, then regulate this for the use of that pedal; or it may (2) use a pair of diodes as halfwave rectifiers and make +/- power supplies out of this.

The problem is again that the 9Vac pedal thinks it can do whatever it wants with the 9Vac and especially make signal ground be anywhere it wants ground, without worrying about what the 9Vac is doing. If you take the same 9Vac and do something else with it, then make signal ground be some result of the power circuit you do, then you have two points, one in the original 9Vac pedal and one in your modification, that are going to be tied together with the shield of a signal cord. If the ground in the original 9Vac pedal and in your modification don't happen to be at *exactly* the same voltage - which is very unlikely - then you are trying to force two different voltages to be at the same point by connecting them with a shield in a cord. This can cause things from subtle to ugly, nasty hum, transformer overheating, and other unpleasant things.

My best advice right now it that no matter how ugly aesthetically offensive you find it, only connect that 9Vac supply to whatever it was intended to power, and nothing else whatsoever. It can cause bad hum in some cases, and fry 9Vdc pedals in others. IMHO it is a cruel joke that 9VAC adapters have the same plug as 9Vdc adapters.

[mozwell]

For posterity, here are some ART schems.
the 127S tube MP sch is the tube preamp you have

[Jazz P Bass]

Cannot view the first two.
Change the file size?

[J M Fahey]

Thanks for posting.

Sorry but both ART310 files have already dissappeared.
Ahh 4 others still can be opened.

[mozwell]

try these