Transformerless Balanced to Unbalanaced and vice versa

[yaniv]

Hi,

Is there a way (or ways ... ) to convert from balanced to unbalanced and vice versa without tranfomers ?

( maybe with operational amp`s ? )

cheers !

 

[rodabod]

[quote author="yaniv"]
( maybe with operational amp`s ? )
[/quote]

Yes, or a differential pair of transistors.

 

[Black Dog]

Take a look at Jakob's GSSL. It does exactly that..

http://www.gyraf.dk/gy_pd/ssl/ssl.htm

http://www.groupdiy.com/index.php?topic=110

Lars

 

[crazytooguy]

Rod Elliot's site has this set of circuits for converting both ways. With high quality opamps, they should sound very transparent...

http://sound.westhost.com/project87.htm

I'm going to breadboard them soon in preparation for constructing a mixing system, but I haven't tried them out just yet.

 

[drpat]

I can't remember their counterparts, but also look into the "Burr-Brown DRV134" and the "THAT 1646".

 

[mcs]

[quote author="mediatechnology"]DRV134s are almost impossible to get right now with TI having "lost" the recipe for most of the Burr Brown line.[/quote]
Que? Lost in what way?

I do have a few DRV134 - are they valuable now? :green:

Best regards,

Mikkel C. Simonsen

 

[yaniv]

Hi,

Thanks you all for the answers !

Well It`s for a little job that my friend asked from me , and he claimes that discrete circuit ( "with transistors, without any chips" ) is sound better then all the chip based circuits ...

Where can I find a reference circuits for receive and drive for balanced/unbalanced ?

Also, Do you agree with my friend opinion ?

Cheers !

 

[yaniv]

what is a servo :?:

 

[mikep]

[quote author="RogerFoote"]
I compared the 1646 with discrete...[/quote]

I got a couple samples last week, still havent hooked them up. have you tried putting the 1646 in a feedback loop?

 

[yaniv]

so just to make it clear.. what I understand is that a discrete circuit is sound better than a chip based circuit.

and that the new THAT products 1606 1646 sound as a discrete circuit .

OK! and what about the receivers ? does the THAT products 1200 is sound like a discrete circuits or still discrete circuit are better for receivers ?

also what is servo ?!

cheers,

 

[VacuumVoodoo]

[quote author="RogerFoote"]yaniv

The THAT chips sound good. They are chips, so are transistors. I think THAT made room on the chip die for larger transistors like the ones you get seperate.
[/quote]

That Corp is using a DI= Dielectrically Isolated process in chip manufacturing. It is essentially equal to discrete design: each transistor/diode/resistor sits in its own SiO2 isolated well on the substrate and there are no parasitic PN junctions between the devices and substrate. The process was pioneered by Harris Semiconductor (r.i.p) in late 60s /early 70s. It also allows for truly complementary npn/pnp transistors, among other advantages. The downside was cost due to larger chip area and more manufacturing steps than conventional bipolar processes.

 

[NewYorkDave]

Who stocks the 1646 in the USA? I Googled the part # and found no dealers except in Europe.

 

[mikep]

[quote author="NewYorkDave"]Who stocks the 1646 in the USA? I Googled the part # and found no dealers except in Europe.[/quote]

Mouser for small quantities. edit: or better yet, from wayne.
call THAT directly for large quantities or for samples, they are very nice (were to me anyway).

mike

 

[DerEber]

German distributor has a minimum order of 50 pices. For the THAT 1646.
http://www.cedos.com/balanced_line_drivers.htm
I would like to try them out. Maybe some others are also interested and we can start a german groupbuy?
Or does anyone know some other good place to get them in germany?
I couldn´t find them in my usual places.
greetings,
Stephan

 

[DerEber]

Thanks for your kind offering! :grin:
Maybe you will soon get an E-mail from me.

But till now I was perserving to live in this world without having a CreditCard or Paypal........
And I did not decide yet, if some little chips will break me down :green:

Stephan