Help to find some components

[Gnome]

Hi all!

I'm about to build a small unisolated powersupply. I have everything ready, except the DC jacks. The jacks I intended to use came out pretty cheapo, the started coming out etc. crappy stuff. Some friends of mine wants me tu build some for them, so I will make a batch of 20 units and try to make it look as professional as possible. Merely for fun, so I can try out mass producing a unit, won't earn much money on it, so it will be very cheap compared to similar units from CAE or Dunlop.

Anyway, so I'll need some other DC panel jacks, and the must not exceed 9mm in diameter (the mounting hole), the crappy ones are 8mm.

The other thing I'm looking for is a decent 1:1 transformer for isolation purpouse which must handle at least 100mA at 9v. I need to build a small box so that I can isolate my DLS EchoTAP, it makes more noise than a concorde at takeoff when not isolated from other pedals. As low profile as possible would be ideal, although it's not an absolute must.

Thanks in advance!

- Emil

[MR COFFEE]

IMHO an unisolated power supply (i.e., a power supply without a transformer between the mains and the circuit) is an idea that should be re-thought. People can be electrocuted that way.

[smallbearelec]

I offer a flat-pack transformer that can be wired for 110/220 to 12 VAC, and the price is very reasonable compared to similar parts by Triad/Magnetek. However, Please Get Help with this project. Anything that connects to the AC line has potential (no pun intended) for lighting you up like a Christmas tree. Please see my articles on constructing Small Warts to get an idea of how I handled some of the electronic and mechanical design issues. My methods are emphatically not the last word, and you must give similar care and research to whatever design you choose or come up with.

Regards
Steve Daniels
smallbearelec.com

[Gnome]

What I'm making is similar to the DC Brick, so I won't touch any voltages higher than about 12,6v. I'm using an external 230-9VAC converter. Anyway, I need to isolate the DLS, and I thought that if I can find a fairly small 1:1 trafo, although I don't know if such thing even excist. I've found some here in Norway, but they are made for 230-230 (way out of question).

I could buy another net tranny, although then I'd rather go for a stanradt 9v wall wart at Clas Ohlson, but then I would have to carry 220 volt all the way to my pedalboard, together with the 9vAC cable. So if there's a simple way of isolating 9vAC and get 9vDC out of it, it would be great. If not, I'll just dump it...

[MR COFFEE]

Emil,

I'm not sure if the issue is that English is not your primary language, or that you are still new to the world of electronics design, but I would suggest that you will get more helpful replies if you first learn more about what you have laying around that you are trying to use and perhaps get some help from someone local in describing what you have in standard electronic terms.

Trying to guess what you have and what you are trying to achieve is difficult, i.e.,

I'm using an external 230-9VAC converter

That usually means a transformer and is therefore by definition an isolated power supply. I may be wrong here, but I have never heard of a solid state device without a transformer (although it might operate a high frequency) that converted 220 VAC (or any other AC voltage) to 9VAC. And by definition, if it has a transformer, it is an isolated supply, not an "unisolated supply." Yes, there are solid-state non-isolated converters for line-related AC or DC input voltages to lower DC voltages, but I've never heard of one that output an AC voltage, nor can I imagine how or why anyone would design one without including a transformer somewhere in the design. (Somebody's gonna pipe up here about the Air Force converting mains voltages at 50-60 hz to 400 hz, but they use a transformer in those too IIRC)

If the issue is electronics knowledge, I would strongly suggest you take Steve's advice and read his articles, and also check out RG Keen's articles on designing power supplies for FX pedalboards with multiple isolated outputs (called the Spyder IIRC). You will probably get much closer to what you are hoping to achieve with less expense, even if it means ditching this "external 230-9VAC converter" you have, whatever it may be, although you may be able to include it in your design if it turns out to be a plastic box containing a 220-to-9 VAC transformer.

And I repeat Steve's and my cautions about the very real dangers of mains voltages if you are not yet proficient in that aspect of electronics. It kills for real.

[Unbeliever]

Merely for fun, so I can try out mass producing a unit, won't earn much money on it, so it will be very cheap compared to similar units from CAE or Dunlop.

Don't you realise part of the 'fun' of this is finding the parts you require, with the specifications you require, all by yourself? I mean - have you even LOOKED on Mouser etc to see what they have?

Also, plugging "9vac dc power supply schematic" into Google reveals this as the very first hit:
http://www.eleinmec.com/article.asp?16