You want a bipolar power supply, probably a linear not switching in the emax, but I am not sure about the last part.
----- Original Message -----
From: ted Summers
To: emax@yahoogroups.com
Sent: Thursday, July 28, 2005 9:42 AM
Subject: Re: [emax] PSU on Emax S.E.
We use ps that have the -12 in video games all the time. The psu from
bgmicro has this already....also they might be referring to the AC
going across the zero v barrier as the sign wave direction changes
(when they are talking about the switching off).
Thanks,
Ted
On Jul 28, 2005, at 1:50 AM, Jean-Marc Mélot wrote:
> Hi Ted.
> Thanks a lot for those informations ! Indeed, i did some search in my
> country about this item. I did pictures from the PSU circuit diagram to
> try to understand the "Logic" used to built this PSU and mail it to
> some
> friends.
> A friend of mine (Sound Engineer for the Belgian television) gives me
> some very important informations :
> The item i'm searching for should be :
> "Through-Hole Schottky Rectifiers" 10A 40v
>
> C10 means 10A peak-measure and P038 should be the Vmax.
> I find specification on thoses parts : "C10P048" and "C10P03Q". The
> diagram on the item is similar, but the difference seems to be the
> "time
> diagram" for the diods used.
> C10P048 & C10P03Q are "Schotty rectifiers" too.
> It's like a redressor but only on a single alternance. It's mainly used
> to stabilize the +5V part of the PSU (on witch the "power-on monitor"
> led is soldered).
> This item cost 1,50 euro approx. I'm gona buy it. If it's not the good
> part, i could think "I did my best".
>
> Yes, another PSU is the solution too ... But it's anyway quite
> "bizzare"
> voltage... The E-MU Emax PSU uses +5, +12, -12, Gnd (3 times repeated).
> But the -12V is not common to me... A typical PC PSU delivers +5/+12
> and
> the "switch" is "logicaly switched to on/off". The other problem is :
> no
> physical ON/OFF switch on those PSU. So i have to find where the PC's
> PSU get their ON/OFF 'switch'.
>
> Is someone who did pictures of this "swapping PSU" on this group ?
> Have you only inverted Gnd & +12V to give -12V to the Emax logicboard ?
>
> Anyway, i'm going to fix this PSU trouble quickly !
> Thanks a lot for all the help you give ! :)
>
> J/M
>
>
> ted Summers a écrit :
>> Well- my friend (he is a Electronics Tech in industry for 25 years) I
>> called tried to cross the item. It is not in the Japanese cross
>> reference. This is what is called an "in-house" part. A company stamps
>> a number on a device that is really only used "in-house" as a part
>> number and is never released to anyone save an OEM. If released
>> generally it is given a different number. This is most likely why it
>> is
>> not cross-able. He also said from the diagram that it is not
>> necessarily a TRIAC either, it could be a DIAC or MOS-FET. On
>> non-cross-able items the diagram may not really be what the item
>> is.....He informed me that TRIACs are almost never used in a power
>> supply. (save when used as a "crowbar", but that is not an industry
>> accepted practice to do...) He has access to purchase obsolete items
>> as
>> well (He makes major IC component purchases for a large (200 site)
>> Amusement Company). He could not source the part. If you ever found
>> it,
>> it might cost as much as $40 plus shipping. That is a big IF
>>
>> The solution he recommended was to buy a small power supply and
>> replace
>> the old PSU. Others have done this here on the group, I believe.
>>
>> I am assuming it is an +5 and +12 power supply (without actually
>> opening it up- can anyone confirm this?)
>>
>> With that assumption: here are some options......
>>
>> www.bgmicro.com look at page 13 of their catalog- cheap and looks
>> promising.... the A+ switcher on this page.....
>> www.jdr.com has open-frame power supplies.
>> http://www.allelectronics.com/cgi-bin/category.cgi?
>> category=480&item=PS-4350&type=store
>>
>> These are all in US- but should give you some ideas....heck bgmicro
>> even takes paypal....
>>
>> Hope this helps,
>> Ted
>>
>>
>>
>>
>> You are looking to provide +5 and +12
>> On Jul 26, 2005, at 7:51 AM, Jean-Marc Mélot wrote:
>>
>>
>>> Thanks a lot Ted !
>>> But i really can't find any kind of informations on this élément :(
>>> I just phone to a important electronic dealer in Brussels but they
>>> cannot help me. This reference is unknown for them.
>>> I'm still searching for any datasheet on the web but without success.
>>> I'm almost sure (i'm living in Belgium) that electronic store have
>>> only
>>> 'Nedis' (Philips) or 'Texas Instrument' equivalence. So i try to find
>>> the specification to get a 100% compatible electronic component.
>>> Have you any idea 'bout the specification for this item ?
>>> Here you can find the drawning of this item :
>>> http://www.moderncubism.com/Z/part.jpg
>>>
>>> J/M
>>>
>>>
>>> ted Summers a écrit :
>>>
>>>> that is a transistor. the C designates it is a japanese part. The
>>>> REAL
>>>> part number would be:
>>>> 2SC10P038
>>>>
>>>> Try and get that part, and all will be good....
>>>> Hope this helps,
>>>> Ted
>>>>
>>>> On Jul 26, 2005, at 3:49 AM, Jean-Marc Mélot wrote:
>>>>
>>>>
>>>>
>>>>> Hi all.
>>>>> I've got a trouble with my EMax S.E.
>>>>> The sampler was "power off" but anyway when, by a sunny morning, i
>>>>> tried
>>>>> to switch it on ... Nothing !
>>>>> My first action was to unscrew the machine and check fuses and
>>>>> others
>>>>> "mechanic" (wire connexion, ...) possibilities. But with success
>>>>> ...
>>>>>
>>>>> So i've tested the internal PSU and noticed the +5V was down.
>>>>> It seems that there are 2 faulty components :
>>>>> - Capacitor (22000 microFarad - 10V) : Electrolytic
>>>>> - Triac (2 diodes, common cathod) but i cannot find any piece of
>>>>> information on this element ... :(
>>>>>
>>>>> The element is screw on a little thermal dissipator with 3 pins and
>>>>> the
>>>>> reference is : C 1 0 P 0 3 8 (and a little code in the right up
>>>>> corner
>>>>> :
>>>>> IR4J).
>>>>> I guest it's just a dual diode redressor with a common cathod
>>>>> (centered
>>>>> pin) but i cannot find specifications... Maybe 10A... And this
>>>>> element
>>>>> is in the low-voltage part of the PSU (10V ... Maybe 12V).
>>>>>
>>>>> Any clue ?
>>>>>
>>>>> Thanks a lot
>>>>> Jean-Marc.
>>>>>
>>>>> --
>>>>> Jean-Marc
>>>>> http://www.moderncubism.com
>>>>>
>>>>>
>>>>> Emax and Emax II User's Group Website
>>>>>
>>>>> http://www.silveriafamily.com
>>>>> Yahoo! Groups Links
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Emax and Emax II User's Group Website
>>>>
>>>> http://www.silveriafamily.com
>>>> Yahoo! Groups Links
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> Emax and Emax II User's Group Website
>>>
>>> http://www.silveriafamily.com
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>> Emax and Emax II User's Group Website
>>
>> http://www.silveriafamily.com
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>>
>
>
> --
> Jean-Marc
> http://www.moderncubism.com
>
>
> Emax and Emax II User's Group Website
>
> http://www.silveriafamily.com
> Yahoo! Groups Links
>
>
>
>
>
>
>
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[Non-text portions of this message have been removed]Message
Re: [emax] PSU on Emax S.E.
2005-07-28 by elmacaco