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What Power Supplies to Use?

post #1 of 16
6/19/10 at 10:52pm
Thread Starter 

I am planning on building a PPA v2 very soon as well as a full++y1 + y2, I am not to knowledgeable when it comes to power supplies, what it all means and exactly what technology i would need for what applications.

 

I was hoping to stick with AMB or tangentsoft since they have the TREAD, Sigma 11, 22, 25, and as well as the YJPS. i am not sure what i should use for what project, and can someone give me the basic overview on how to figure out what i would need for a project etc etc. like jsut the all around basics about regulated power supplies.

 

thanks for any and all help

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post #2 of 16
6/20/10 at 1:21am

The γ1/γ2 can be powered by the USB port of your computer, or you could use a 5V regulated DC wallwart or external power supply.  See the γ1 website "Parts list" section for details and recommendations.

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post #3 of 16
6/20/10 at 10:42am
Thread Starter 

oh i dont plan to use the USB. and i would like the highest quality possible so i think ill be going for either the sigma 11 or 25, is the 11 overkill for the y2/full++?

 

but i still need to know what to get for the PPA v2, as well as some basic understanding so i can wrap my head around the idea, ive tried looking some of it up before and it gets pretty complicated

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post #4 of 16
6/20/10 at 7:06pm
Thread Starter 

should i use a sigma 11 or YJPS for my PPA v2? it seems the PPA needs something a little bit more hefty than what the sigma 25 or a TREAD will offer (but then again i dont really know)

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post #5 of 16
6/20/10 at 8:43pm

PPAv2 will typically draw ~100mA of current depending on how you bias the output stage, as long as you use a heatsink on the regulator, either TREAD or σ25 will be adequate.  However the YJPS and σ11 are superior supplies, so it's your choice which one to use.

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post #6 of 16
6/20/10 at 8:55pm
Thread Starter 

okay, that sounds good, i think im gonna go for the YJPS for the PPA v2 and a sigma 11 on the y1/y2, just to have the best setup possible

 

EDIT: is the sigma 11 overkill for the y1/y2? or should i maybe just go with a sigma 25 or TREAD and be done with it?


Edited by phishhead92 - 6/20/10 at 8:59pm
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post #7 of 16
6/21/10 at 6:49pm

IIRC, the Sigma11 has lower noise characteristics than the Sigma25 and TREAD. Whether or not that effects the sound and if that makes it overkill depends on your point of view. If you're talking solely about current capacity, the Sigma11 is definite overkill. Personally, I'm casing a Sigma11 up for my gamma2 just because I happen to have a spare one .

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post #8 of 16
6/21/10 at 7:21pm

Before you focus on the low noise of the sigma11 or YJPS for the y2, I suggest you look at the noise figures of the on-board regulators.

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post #9 of 16
6/21/10 at 9:38pm
Thread Starter 

 

Quote:
Originally Posted by cobaltmute View Post

Before you focus on the low noise of the sigma11 or YJPS for the y2, I suggest you look at the noise figures of the on-board regulators.

 

lil bit late, i just got 1 TREAD and 1 sigma 25, stock parts (like ones listed/reccomended on the sites respectively), also since i am new to DIY and this sort of thing, im not sure how to do that/what parts to look at etc etc

 

These will be my first DIY projects, im not sure what PSU i will be using for what project but all the parts will come to me soon enough, im really excited.

 

I might be making a custom wooden box for the PPA, i want to put the PSU in the box with it, and the y1/y2 i guess i will just have to cope with another small box on the side haha, i got that enclosure that holds all 3 PCBs, along with the nice front panels.

 

I might have to ask for some assistance on the wooden box setup just cause of the pot and the headphone jack (the nutrik locking one), or do you guys think i should go with a metal case? just a wooden one seems sleeker, but then again it doenst breathe very well, but fans and slotting could fix that, idk though, any suggestions?

 

Also, for the PSUs. i grabbed the molex connectors just in case, but what do you guys think about connecting straight to the PCB or through the molex? it seems the molex is for ease of use, while soldering straight to the board would be better quality. ideas on this as well?


Edited by phishhead92 - 6/21/10 at 9:40pm
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post #10 of 16
6/22/10 at 6:25am
Quote:
Originally Posted by phishhead92 View Post

 

 

lil bit late, i just got 1 TREAD and 1 sigma 25, stock parts (like ones listed/reccomended on the sites respectively), also since i am new to DIY and this sort of thing, im not sure how to do that/what parts to look at etc etc

 

 

My point was to look at the fact that the on-board regulators are rated as noiser by the datesheets than the YJPS/sigma11.  You'd spend a bunch of money on the external power supply for low noise, only to lose some of the advantage with the on-board regulators.

 

I think given the choice, that a TREAD or sigma25 is fine for supplying power to a y2.
 

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post #11 of 16
6/22/10 at 11:18am
Thread Starter 

oh so what components are the noisy ones? i really want to learn about all this stuff, im thinking about picking up like a electrical engineering course, like jsut the intro so i can learn about all this circut design and all the components and how they work together
.

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post #12 of 16
6/22/10 at 12:42pm

The γ1/γ2 uses either the TPS793xx or LP2985 series of onboard voltage regulators.  The TPS793xx datasheet states 33uVrms for the TPS79328 (200Hz - 200KHz @ 200mA current), and 30uVrms  the LP2985 (300Hz-50KHz, no current specified).  Both of these are excellent and I would hardly call them "noisy".  A σ11 @ 5V has output noise in the low single-digit uV range, and a 78xx-based regulator probably has about 10x-100x that noise (depending on which specific one you use).  But noise isn't the only parameter of interest, and "overkill" is in the eye of the beholder.

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post #13 of 16
6/23/10 at 8:24am

I know what's overkill....feeding the y1/y2 DAC 12V instead of 5V 

 

In other news, I'm putting a usb jack on the back of my sigma11. Would using a sigma11 to charge an ipod be considered overkill? :)

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post #14 of 16
6/23/10 at 9:21am
Quote:
Originally Posted by Nebby View Post

I know what's overkill....feeding the y1/y2 DAC 12V instead of 5V 

 

 

With the LP2985 regs, it is perfectly valid.  They handle 16V max at the input.  TPS regs, not so good.
 

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post #15 of 16
6/23/10 at 9:39am

Yes, not so good indeed. Learned that one the hard way :p

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