Balancing circuit question....

[Leslie West]

Hi,
i found this little schematic.

Is it a good way for a electronic balance output?
If yes, what op can I use. I have a few 5534/5532. Can I use them?

If it´s not a good way for a electronic balance output,.... why?.... :grin:

Thanks in advance

Leslie

 

[Samuel Groner]

If I read your schematc correctly (bit in a hurry right now), this is the standard cross-coupled configuration. This circuit will behave nicely, but it has two disadvantages IIRC:

* max. output is limited to what a single opamp can deliver (+22 dBu typ.)
* if you ground one leg, distortion will be pretty high on the other leg

You may be able to live with that depending on your application.

If not, have a look at the Barry Porter balanced out. Can't finde the schemo on the net right know, but's somewhere out there!

5532 and 5534 are a good choice for both circuits.

Samuel

 

[kevinc]

I daresay that an appropriate transformer will do the job as well (in some ways better) with less fuss-and-muss. An LL5402 (at $52 each) is a standard approach to this need.

 

[Samuel Groner]

Can't finde the schemo on the net right know, but's somewhere out there!

Here we go:

http://www.wavefront.mcmail.com/neteq.pdf

Has a nice EQ in front of it...

Samuel

 

[Svart]

I've been looking at a few of these same circuits and have one question about the one shown in the first post of this thread.. is the input assumed to be line level and is the output supposed to be +4 or -10 or line level also?

 

[Svart]

also I was looking at the GSSL output section.. the second half(-output) of the 5532 inverts the signal from the first half(the +output).. wouldn't this cause a small phase shift between the two signals?

I would think that an arrangement like that seen in the first post would allow the signals to be in phase but 180 deg in polarity..?

anyone?

 

[Svart]

bump...??!?!

 

[Samuel Groner]

is the input assumed to be line level and is the output supposed to be +4 or -10 or line level also?

This circuit is supposed to work at line level (+4 dBu or -10 dBV). It will be too noisy for most mic level stuff and too weak for speaker level...

I would think that an arrangement like that seen in the first post would allow the signals to be in phase but 180 deg in polarity..?

Inverted polarity, that's what we want.

also I was looking at the GSSL output section.. the second half(-output) of the 5532 inverts the signal from the first half(the +output).. wouldn't this cause a small phase shift between the two signals?

You mean the inverting stage would introduce some delay? That's true, but these few nanoseconds are insignificant.

Samuel

 

[Svart]

thanks! just making sure!