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Triple Chorus Transformer
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author Triple Chorus Transformer
ekoch
I'm building the JH triple chorus with onboard PSU. Currently attempting to source a 18vac transformer that will fit on 3mm standoffs in a case 1.74in high. Found a couple on Ebay that might BARELY fit, but if anyone knows a source of good quality slim toroidal type it'd be appreciated. thanks in advance.
letness
I don't have an answer, I'm afraid, but a related question.

I'm gathering parts for my own Triple Chorus build, and I'm wondering whether there is any advantage to using an onboard transformer instead of a wall wart. Do you anticipate better sonic performance? Is it a switching v. linear issue for this application?

Sorry that I can't answer your question--maybe the bump will nudge someone who can.
ekoch
letness wrote:
I don't have an answer, I'm afraid, but a related question.

I'm gathering parts for my own Triple Chorus build, and I'm wondering whether there is any advantage to using an onboard transformer instead of a wall wart. Do you anticipate better sonic performance? Is it a switching v. linear issue for this application?

Sorry that I can't answer your question--maybe the bump will nudge someone who can.


From what I understand wallmount transformers introduce more ripple and noise. This will effect the performance of the instrument...I learned this with Eurorack. The upgrade from an external cheap psu and "bus power" to Hinton was like night and day for me and really sold me on this question. I've built another such rack effect with an external psu and it sounds just fine but I'm sure it would sound better with a different supply. The transformer also vibrates against the plastic and has to be constantly adjusted.

I think wiring the transformer, besides sourcing, introduces lots of potential problems. The technician at my job told me toroidal transformers have to be shielded with a metal case to avoid noise in the audio path. Also need to invest in a heat gun etc to properly do the job. I'm after the skill though so it's worth it to me.
ekoch
It's really great to have an experienced technician at your job haha...he pointed out to me that I could just use a 36ct transformer and just connect one of the secondary windings. Turns out there are many more 36 than 18vac transformers on mouser.

I will likely use something like this. seems like plenty of clearance.

http://www.mouser.com/ProductDetail/Hammond-Manufacturing/186B36/?qs=s GAEpiMZZMvwUzoUXIIvyQPvPmwnNFGyT14KhvTaHWE%3d
letness
Thanks for the insight re: wall warts v. internal transformers--for some reason, I hadn't connected the dots between modular PSUs and self-contained projects. Having zero experience with mains power, I think I'll stick to an AC wart for now (which, if I'm understanding the power options correctly, should work).

Glad you found a transformer that will fit your build!
sanders
I have one of these PCBs, and accompanying BBDs that I'd love to get started on soon. The power supply was one of the details holding me up as I'd like to build my Triple Chorus as a stand alone as well. I'll probably try the same transformer you've found, if it ends up working well.

I'd be super grateful if someone would use this or another topic to document their TC build, to any extent. I always find it very helpful and inspiring to see how others approach the same problems I'm likely to encounter.
ekoch
sanders wrote:
I have one of these PCBs, and accompanying BBDs that I'd love to get started on soon. The power supply was one of the details holding me up as I'd like to build my Triple Chorus as a stand alone as well. I'll probably try the same transformer you've found, if it ends up working well.

I'd be super grateful if someone would use this or another topic to document their TC build, to any extent. I always find it very helpful and inspiring to see how others approach the same problems I'm likely to encounter.


I am building a pair of units..would be happy to share my process on here. Have the panels in hand now so hopefully getting started with it in a couple weeks or so. These projects are always slow cookers for me though meh
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