The Definitive Connecting Power Thread

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neil.johnson
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Re: The Definitive Connecting Power Thread

Post by neil.johnson » Wed Sep 09, 2020 1:48 pm

The_hitcher wrote:
Wed Sep 09, 2020 1:41 pm
I just started building DIY modules and a lot of folks use a "bench power Supply" I can gather what that is by the name. However, not having one I use my rack. Can you damage your power supply in your case with a muffed up module? The magic smoke came out of one build so far but it had resistors in place in case power was accidentilly inverted. Is my power supply going to be okay? Tip top mantis case.
The one I recommend is the HP 6236B: https://www.njohnson.co.uk/index.php?me ... enu=8#psus

You were probably lucky in your case that the module did not damage the power supply, nor any other modules plugged into it.

Best to build and debug your new design first, and only once you are happy it is working correctly then bring it into your rack.

Neil
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SSI parts and more :: https://www.cesyg.co.uk

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The_hitcher
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Re: The Definitive Connecting Power Thread

Post by The_hitcher » Wed Sep 09, 2020 1:56 pm

I actually have a set of Tip Top Bus Boards and a power supply I no longer use. But you're saying that damage to the PSU could have been done. I build these modules, but I don't really know that much about what's actually going on. Could be the ADD, but looking at schematics gives me a headache.

I guess you'd have to whip up some kind of solution to connecting to that thing? Some kind of jumpers to the module?

mr221
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Re: The Definitive Connecting Power Thread

Post by mr221 » Wed Sep 09, 2020 9:31 pm

Has anyone used the A-100SSB in the doepfer a-100LC1? Curious if this would be a better or worse option than a behringer CP1A for powering a bunch of modules.

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Re: The Definitive Connecting Power Thread

Post by JimboJones » Sun Dec 20, 2020 11:22 am

I'm planning on switching my uZeus for a Source D'Energie due to the bigger -12V headroom (500mA on the uZeus is not enough). Eowave recommend a power supply with 4A max., the one I use for my uZeus checks all the boxes but has 4,62A max. Would this be a problem or can I use it without worries on the Source D'Energie?

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Ricochet
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Re: The Definitive Connecting Power Thread

Post by Ricochet » Sat Dec 26, 2020 12:25 pm

DOEPFER PSU V3.0

my question applies to the primary mains connection for 220V
doepfer PSU V3.0  - primary side
doepfer PSU V3.0 - primary side

primary side - detail
primary side - detail
detail left
detail left
detail right
detail right
you can see the connections J9 / J11 ​​and J13 / J23

measured resistance between 9-11 and 13-23 each about 12 ohms

are these the two coil turns for 110V AC each?

And is it correct to create a bridge from J11 to J13 and then to connect 220V AC to J9 and J23 ?!!
sailing away with the first winds of the new day !

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Re: The Definitive Connecting Power Thread

Post by _lampshade_ » Sun Dec 27, 2020 12:04 am

Image

So i hit the limit of 500 on the negative 12 volt rail of my tiptop uzeus with boost adapter.

I have the Ikarie filter coming in the mail and plan to get the Ens osc soon as well 100 and 50 respectively on -12 v which puts me at 514.

Should i consider adding another flying bus power supply just to handle the slight overage or should i just go ahead and upgrade to a whole new supply that can handle it? or suck it up and try to get rid of / swap out modules for equivalent ones ones with less power usage on -12v.

I have had no problems with the Zuess up till now and i don't want to expand past 6u 140.


Sorry if this isn't the right place to ask

Thanks

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Ricochet
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Re: The Definitive Connecting Power Thread

Post by Ricochet » Sun Dec 27, 2020 9:47 am

Ricochet wrote:
Sat Dec 26, 2020 12:25 pm
DOEPFER PSU V3.0

my question applies to the primary mains connection for 220V

doepfer PSU V3.0-1.jpg



doepfer PSU V3.0-2.jpg
doepfer PSU V3.0-3.jpg
doepfer PSU V3.0-4.jpg

you can see the connections J9 / J11 ​​and J13 / J23

measured resistance between 9-11 and 13-23 each about 12 ohms

are these the two coil turns for 110V AC each?

And is it correct to create a bridge from J11 to J13 and then to connect 220V AC to J9 and J23 ?!!
the solution of the primary connection is:
erica PSU V3.0.jpg
110V = J13 / J23 ... and J9 / J11 are not used (insulation !!)

220V = J9 / J 13 ....and J11 / J23 are not used (insulation!)

It's an erica-synth PSU indeed, not doepfer
sailing away with the first winds of the new day !

electrosandwich
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Re: The Definitive Connecting Power Thread

Post by electrosandwich » Wed Dec 30, 2020 1:49 pm

_lampshade_ wrote:
Sun Dec 27, 2020 12:04 am
Image

So i hit the limit of 500 on the negative 12 volt rail of my tiptop uzeus with boost adapter.

I have the Ikarie filter coming in the mail and plan to get the Ens osc soon as well 100 and 50 respectively on -12 v which puts me at 514.

Should i consider adding another flying bus power supply just to handle the slight overage or should i just go ahead and upgrade to a whole new supply that can handle it? or suck it up and try to get rid of / swap out modules for equivalent ones ones with less power usage on -12v.

I have had no problems with the Zuess up till now and i don't want to expand past 6u 140.


Sorry if this isn't the right place to ask

Thanks
I don't think anyone but yourself can answer whether you are willing to sacrifice certain modules based on their power usage, but what I can say is that I started with uzeus power supplies, and I was constantly running up against the 500 limit on the negative rail, and it was incredibly frustrating. I'd have to keep moving modules around to different rows to stay under the limit, or sacrifice them entirely, and it was really cramping my creative process. If the uZeus modules were like 1,750 on the positive and 750 on the negative...they would be perfect for my use, but alas they are what they are. I finally ended up caving and moving to the 4ms row power solution. Takes up slightly more HP to have a module on each row, but the distribution between +12v, -12v, and 5v is way more optimal, and I literally don't have to think or worry about power anymore, which removes a barrier between the rack and myself. I'll admit it's frustrating to having to spend hundreds of dollars just dealing with power issues, when that money could be spent on more creative areas, but i think the return on that investment has been overall positive. Just my experience is all!

modeleus
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Re: The Definitive Connecting Power Thread

Post by modeleus » Wed Jan 13, 2021 7:47 am

_lampshade_ wrote:
Sun Dec 27, 2020 12:04 am
Image

So i hit the limit of 500 on the negative 12 volt rail of my tiptop uzeus with boost adapter.

I have the Ikarie filter coming in the mail and plan to get the Ens osc soon as well 100 and 50 respectively on -12 v which puts me at 514.

Should i consider adding another flying bus power supply just to handle the slight overage or should i just go ahead and upgrade to a whole new supply that can handle it? or suck it up and try to get rid of / swap out modules for equivalent ones ones with less power usage on -12v.

I have had no problems with the Zuess up till now and i don't want to expand past 6u 140.


Sorry if this isn't the right place to ask

Thanks
I tend to recommend to change the flying bus to a proper bus board with extra Amps, you will gain in current for all your present and future modules, gain 4HP of space that is vital for that packed case and improve the potential noise problems that the flying bus has.
But you have the last word as you are the only one who knows how is your system evolving.

Tell us what your final decision was.

modeleus
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Re: The Definitive Connecting Power Thread

Post by modeleus » Wed Jan 13, 2021 7:52 am

The guys at Genus Modu made a paper explaining all the concepts and potential problems in Eurorack Power Distribution with very cool measurements, graphics and explanations. If someone is interested in knowing more about some noise-related issues you may have with your system here is the link:

http://www.genusmodu.com/products/libb-wp-01.html

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