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 Forum index » DIY Hardware and Software » Developers' Corner
Where to buy a triple output (5v/+15V/-15V) transformer?
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tysseng



Joined: Apr 14, 2013
Posts: 7
Location: Norway

PostPosted: Sat Sep 28, 2013 4:47 am    Post subject: Where to buy a triple output (5v/+15V/-15V) transformer? Reply with quote  Mark this post and the followings unread

I guess this cannot be the first time this question pops up, but I haven't found anything about it while searching.

Where can one buy a transformer with triple secondaries (5/+15/-15 V)?

I have a JP-8000 and just broke the input transformer (oh, the fun of forgetting that you are using a japanese synth in europe...).

The transformer has three separate secondaries, 5V and +/-15V and is rated at 21W (100V) to 28W (240V). Part number is 22455694U0 and it is originally produced by Bando. I have tried searching the web for anything similar, and have come up with two possible alternatives:

- Signaltranformer DMT-7-15 (http://www.signaltransformer.com/sites/all/pdf/MT-DMT.pdf)
- MCI transformer 4-07-7515 (http://www.mcitransformer.com/i_4-06_2.html)

Problem is, both companies (and even Digikey) require a minimum order of 25.

Any ideas about other vendors/places to buy these?

I could of course build a PSU from a twin secondary transformer, or buy a new triple voltage PSU, but it would be a lot easier to just replace the transformer.
--
cheers,
Joakim
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gdavis



Joined: Feb 27, 2013
Posts: 146
Location: San Diego

PostPosted: Wed Oct 02, 2013 3:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

I was hoping you'd get an answer to this. I'm going to need a similar supply for the project I'm working on. I was looking for a transformer like this but wasn't having any luck which kind of surprised me.
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Faderpush



Joined: Feb 26, 2014
Posts: 1
Location: Australia

PostPosted: Wed Feb 26, 2014 4:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Did you have any luck fixing your JP8000...what did you end up doing in the end?
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wackelpeter



Joined: May 05, 2013
Posts: 43
Location: germany
Audio files: 6

PostPosted: Wed Mar 12, 2014 11:29 am    Post subject: Reply with quote  Mark this post and the followings unread

if you have 230V AC Input in your transformer i would suggest you to ahve a look at this one: Traco Power TMP 15515C

230V AC Input
+5V DC and +/-15V DC

also another model with higher output current is available: TMP 30515

2 Versions exist one with small Chassis (the C Version) and another to be soldered on stripboard...


It's a bit late my reply but i hope that helps a bit...

don't know if they are available everywhere but here in Germany you can find them at the online store from Reichelt Elektronik
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tysseng



Joined: Apr 14, 2013
Posts: 7
Location: Norway

PostPosted: Sat May 03, 2014 4:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi! It's been a while but i managed to fix the JP Smile

I ended up buying the PSU from a JD800 from a guy on Ebay in Italy. From the pictures the transformer looked quite similar, and the service manual indicated that it could possibly work (quite similar circuit layout). It didn't say the current ratings for each voltage but I took a chance and bought it anyway.

I got the PSU and even though the transformer had a different part number, it was the same size and fit the JP-8000 perfectly. It didn' take long to replace either, and worked perfectly. In fact, I got and replaced the part exactly 6 months (to the day) after I broke the previous one.

I still would have liked to try a different transformer though. I am also looking for something to power a diy polysynth. So far I've just connected two regulators to the same secondary wiring to get +5 and +15V, not sure if that's a good idea? If not, one could of course use a second, smaller transformer for the 5V, to complete isolate it from the analog +/- 15V.
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gdavis



Joined: Feb 27, 2013
Posts: 146
Location: San Diego

PostPosted: Sat May 03, 2014 7:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

tysseng wrote:

I still would have liked to try a different transformer though. I am also looking for something to power a diy polysynth. So far I've just connected two regulators to the same secondary wiring to get +5 and +15V, not sure if that's a good idea? If not, one could of course use a second, smaller transformer for the 5V, to complete isolate it from the analog +/- 15V.


The problem is that the regulator is dissipating all the extra power from dropping 15 to 5V. Of course the power also depends on the current. If the 5V is only supplying a small amount of current it may not be much of an issue, as current increases it becomes more of one.

As long as it's sufficiently heat sunk and you're not exceeding the input voltage rating of the regulator, it should be ok, just inefficient.

I think a DC-DC converter is supposed to be more efficient.

Glad you got the JP working.

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