[sdiy] Modding Matrix 6R PSU?

[cheater00]

I got shocked once when squeezing a door bell - there were live wires
on the other side. The spasm made me squeeze even harder. If someone
hadn't knocked me away I would've probably fried :) Cool. huh?

> I'm not one of those who carefully obey all 3 pages of safety b.s. from
> the intro of the average instruction manual, but to say 220V can't do
> you harm is pretty risky.

I was just kidding. Thanks for the care though, appreciated!

D.

On Thu, Sep 24, 2009 at 9:51 AM, ChristianH <chris at chrismusic.de> wrote:
> Oh dear, cheater. I think this attitude is heavily objectionable, at
> least when shown in public.
>
> Ok, it's true that touching 220V isn't necessarily lethal (yup, I know
> what it's like too). But this is only when you have the space and the
> opportunity to remove your hand immediately.
> Imagine, you stick your finger into a live PSU inside a casing where you
> can't get away that quick - don't be surprised if you had to leave the
> workshop in a tin box, if you know what I mean.
>
> I'm not one of those who carefully obey all 3 pages of safety b.s. from
> the intro of the average instruction manual, but to say 220V can't do
> you harm is pretty risky.
>
> Chris
>
>
>
> On Wed, 23 Sep 2009 21:38:07 +0100 cheater cheater <cheater00 at gmail.com>
> wrote:
>
>> Don't worry, I got shocked by 220V thrice on different occasions as a
>> small kid. One more won't do anything the previous ones couldn't.
>>
>> D.
>>
>> On Wed, Sep 23, 2009 at 4:49 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
>> > I did something similar to a US Korg Polysix once upon time.
>> >
>> > Here's how I'd go about it:
>> >
>> > 1) Disconnect the transformer secondary wires from the rest of the power
>> > supply so you don't blow anything up.
>> > 2) Test it as it stands now so that you know how much AC the AC/DC
>> > conversion part of the power supply is expecting. You need a 240/120V
>> > adaptor for this. Beg/borrow or steal one from a building site.
>> > 3) Have a cup of coffee so you brain is awake enough to deal with mains
>> > electricity and/or stand on a rubber bathmat ;)
>> > 4) Disconnect everything
>> > 5) Have a look at the primary side of the transformer. Usually this consists
>> > of a pair of windings of which one is used for 120V and both are used (in
>> > series) for 240V. Sometimes there'll be four wires, two each for the two
>> > windings, and sometimes there are only three, with one common to both
>> > windings.
>> > 6) Solder it up with both primary windings in series
>> > 7) Reconnect and test the secondary output. With a bit of luck, the lights
>> > in your house are still on, and the secondary voltage is the same as it was
>> > in step 2.
>> > 8) If it is, wire it all back up and bingo!
>> >
>> > Fur gawd's sake, be careful.
>> >
>> > T.
>> >
>> > On 23 Sep 2009, at 09:23, cheater cheater wrote:
>> >
>> >> Hi guys,
>> >> I have recently bought a Matrix6R. It's a 120V version, supposedly.
>> >> However, it turns out that the transformer inside it is rated as:
>> >>
>> >> 100V/230V
>> >> 41V    30VA
>> >>
>> >> ..which looks promising I guess?
>> >>
>> >> The whole marking on it is:
>> >> BANDO EP-55
>> >> (307-01257)
>> >> BE2-GJM
>> >>
>> >> 61-12663
>> >> 100V/230V
>> >> 41V 30VA
>> >> and then a line of Japanese :)
>> >>
>> >> soooo.... anyone got a clue what I'd do to make this thing eat 230V?
>> >>
>> >> Thanks
>> >> D.
>
>
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