Build This MoFo!

[vdi_nenna]

but you'll get rail almost instantly , when you reach lowest working voltage of SMPS

Had a feeling something like this- act funny until proper AC.

A bulb tester might work.

I guess this might be another drawback to SMPSs.

 

[Eric]

A lot of people love these SMPS power supplies and I suppose they vary quite widely in quality, but the few I've had were TERRIBLE and blew all kinds of noise back into the house AC mains as well as into the amp they were connected to.

I'm not interested in them any more...

 

[vdi_nenna]

Yeah, out come remains to be seen, but will give it a try.
Case is big enough for linear supply, if results are not good.
Going to hope for the best...

 

[drpro]

Vunce, here are a couple of chassis photos, I have never gone this route before, usually bought from the Store.

 

[Vunce]

Drpro,
The frame work looks so cool! I like it 😀
Are those the same heatsinks that MR used for his monoblocks?
What are the panels going to be made of?

Cheers,
Vunce

 

[Michael Rothacher]

A lot of people love these SMPS power supplies and I suppose they vary quite widely in quality, but the few I've had were TERRIBLE and blew all kinds of noise back into the house AC mains as well as into the amp they were connected to.

I'm not interested in them any more...

Yes, I've had some really crappy ones too. You take your chances on surplus and bargain bin stuff. If a deal looks too good to be true, it probably is.

The specific supply I referenced in the article is very quiet in this circuit. 🙂

 

[Eric]

dpro: that's a pretty nice looking chassis - do you mind sharing your source?

 

[drpro]

Thanks Vunce. The heatsinks came from China, only 15usd each, the gotcha was the shipping. Total for both was about 100usd. The ones Michael used, I believe are about 65usd plus shipping, so some savings there. All sides will be wood. The bottom is 5/8" ply and the remaining sides will be stained 1/8" (3mm) ply. Per your suggestion of venting in the top, I am going with a brass screen inset from McMaster-Carr.

Eric, that is extruded aluminium stock that you can buy from a number of sources around the world. 8020, T-Slots, Parker, Bosch, FrameWorld, MainFrame, Maytec, T-Nutz.

I have used both 8020 and T-nutz on other projects. 8020 has an Ebay store with items a bit less than their regular prices. T-nutz is even less expensive with fewer choices, but they offer precut pieces.
The frame in my photos is all T-Nutz 12" pieces, except for the four vertical pieces which I cut from some 12" ones. All of the hardware came from T-Nutz and McMaster-Carr.

More photos to follow as move towards completion.
Thanks
David

 

[vdi_nenna]

You take your chances on surplus and bargain bin stuff.

You mean the $32 Mean Well power supply I picked up from Parts Express won't cut it? 😉
I imagine a good smps costs 3x that. 🙂

Opps, the Mouser 709-GST90A19-P1M is a Mean Well. Surprise!

 

[Eric]

Thanks for the details, David! After I posted my earlier message, I was looking at your image again and wondering if this was a diy chassis frame. Very nice work!

 

[Vunce]

A lot of people love these SMPS power supplies and I suppose they vary quite widely in quality, but the few I've had were TERRIBLE and blew all kinds of noise back into the house AC mains as well as into the amp they were connected to.

I'm not interested in them any more...

Hi Eric,

I’m using these for my MoFo and they work very well, noise free 🙂

Regards,
Vunce

Mean Well# GS120A24-P1M.
Input: 100-240 Vac, 50/60 Hz, 1.4A.
Output: 24V, 5A, 120W max.
Table-top style switching supply, 6.50" x 2.60" x 1.38". 4' output cable with ferrite noise suppression bead and 2.5mm plug, center positive. Detachable 3-conductor power cord. CE, TUV, cULus.

 

[Michael Rothacher]

@vdi_nenna

I'm not sure what your point is, Vince.

As I said, I have also gotten some pretty crappy stuff from the bargain bin too. I've had had good luck with Meanwell's, not so much with WungFoo. 🙂

 

[vdi_nenna]

Hi Mike,

My point is very simple. I was mainly making a joke at my lack of knowledge.

I thought I bought a bad smps, because I don't know thedifference from a good one or bad one. Then, I realized the article's recommended smps is a Mean Well. I bought a Mean Well power supply too (a cage version). So, I might be in good shape as far as quality of smps go.

If I recall, the article mentioned the circuit naturally rejects PS noise anyway? Sounds good to me...

I'm honestly sorry that I don't get my point across well sometimes and causes people confusion and/or angst. 🙂

That's it; that's all. Nothing more. It's all good. 🙂

thanks,

Vince

 

[Michael Rothacher]

I think our wires were crossed. No worries, my friend. 🙂

 

[Vunce]

MoFo boards back in stock, Yahoo!!

 

[Vunce]

Hi David,

The chokes do get warm, drill a few holes in the base plate also so you have air coming in as the warmer air exits the top.
Going to be sweet when your done!

 

[Vunce]

I've got a pair on the bench to test. I'll keep you posted. 🙂

Hi Michael,

Did you get a chance to play around with the Lundahl chokes?

Regards,
Vunce

 

[Michael Rothacher]

I'm sorry, no. I'll try to get to that this weekend. 🙂

 

[Michael Rothacher]

MoFo boards back in stock, Yahoo!!

With stickers! 🙂

 

[Eric]

I’m using these for my MoFo and they work very well, noise free 🙂

Regards,
Vunce

Good to have some input on one that works well - thanks for the details!