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Discussion Starter · #1 ·
OK, i am not the smartest guy in the world, but this is the idea i am proposing. There are some great 110v ac processors out there, but unless a dedicated dc power supply is built. Has anyone tried using a high quality UPS in their car? Many UPS are based on a 12v automotive or motorcylce cell, so we can use its inverter and voltage stabilization features to supply a clean signal. Try and find one that does use a 12v batter, and just couple it to the cars charging system with an in-line 12v regulator? What do you guys think, possible, or no? I figure that since all hospitals, server stacks... etc rely on these devices to supply clean current, and offer seemless performance either on, or off power, that it should be a clean enough signal for our processors?

Looking forward to input.
Hans
 

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Interesting idea, but no idea if it will work out, to damm tired to think about it much, dang business is killing me, lol!

Rick
 

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Discussion Starter · #3 ·
It should work, but the trick is finding a nice ups with true "pure signwave" type output, that just has a bad battery. Replacement batteries are damn expensive, so they often get thrown out, especially in critical apps like hospitals and server farms. I am going to go to the local university surplus storehouse, and see if i can find any. A cheap ups like the $100 ones at bestbuy are essentially just a cheap inverter and a small sealed lead acid battery.
Hans
 

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Problem is isolation... if the power ground isn't isolated from the audio ground you're going to get ground loops/whine/noise in your system.

If you have to have a working 12v power supply for the Behringer right now, and can't wait a few weeks then the only solution I know of currently would be:

http://never.net/powersupply/

combined with one of the following:

http://www.davidnavone.com/images/products/N-IP12A2a.jpg
or
http://www.rane.com/bb44x.html with option 88.

Not cheap as you will see...

Navone's power supply is a cleaner solution since it's cheaper and you don't have to worry about any transformers in the signal path messing up the sound. Rane solution is nicer, since it converts the balanced outputs to unbalanced rca for you, and uses very high quality transformers. Unfortunately, you lose quite a bit of signal output and the price is extremely high.
 

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Discussion Starter · #6 ·
I have one that i am working on. I have 2 working prototypes, and will be testing them side by side to see which one sounds better. I know dang is working on his own too. If i finish before him, i will send him one of mine for testing, and then he can see if he wants to offer it to the forum. I will not steal any of the managements business, but do know that there will be a solution soon.
Hans
 

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npdang said:
Problem is isolation... if the power ground isn't isolated from the audio ground you're going to get ground loops/whine/noise in your system.

If you have to have a working 12v power supply for the Behringer right now, and can't wait a few weeks then the only solution I know of currently would be:

http://never.net/powersupply/

combined with one of the following:

http://www.davidnavone.com/images/products/N-IP12A2a.jpg
or
http://www.rane.com/bb44x.html with option 88.
IP
Not cheap as you will see...

Navone's power supply is a cleaner solution since it's cheaper and you don't have to worry about any transformers in the signal path messing up the sound. Rane solution is nicer, since it converts the balanced outputs to unbalanced rca for you, and uses very high quality transformers. Unfortunately, you lose quite a bit of signal output and the price is extremely high.

I know I have asked this before, but can you clarify why you would need the
N-IP12A2 or the balance buddy? Is this becuase the never.net ps is not isolated so you can either:

a) Isollate the 12v ps using the N-Ip12A2. Since the ps is isolated, simple RCA-XLR conversion cables can be used.

b) Convert RCA-XLR using transformers (balance buddy). This will reduce/eliminate noise so isolating the ps is not necessary

Am I close?
 

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Discussion Starter · #8 ·
The only real way to convert balanced to single-ended is with an additional opamp. I can post a schematic showing how to do this. It would require tapping into the +/-15v supply to power the daughter board. That is pretty much what is in those black boxes. Basicly, very basicly, all the circuit would do is compare the + and - signals of the balanced connection, and sum them into a singal + connection to be used with ground to form a single ended connection. This is a portion of a board i have been working on. use whatever opamps you want. The opamp on the cirucit will work with lower voltages. The behringer uses JRC4580 opamps if you want to use all the same in the output stage.
Hans
 

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mbcouple said:
The only real way to convert balanced to single-ended is with an additional opamp. I can post a schematic showing how to do this. It would require tapping into the +/-15v supply to power the daughter board. That is pretty much what is in those black boxes. Basicly, very basicly, all the circuit would do is compare the + and - signals of the balanced connection, and sum them into a singal + connection to be used with ground to form a single ended connection. This is a portion of a board i have been working on. use whatever opamps you want. The opamp on the cirucit will work with lower voltages. The behringer uses JRC4580 opamps if you want to use all the same in the output stage.
Hans
Yes, actively but it can also be done with transformers.

http://www.jensen-transformers.com/

Chad
 
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