BALANCED LINE DRIVER,PCB layout share - Page 9

paulb · 7th September 2006, 05:51 PM

Quote:

Originally posted by mcowher
Where can I get the DRV134 (or DRV135) chips? I've scoured the internet, and I either have a minimum order for around 50 or more, or I have to wait 4 months for a sample from Texas Instruments.

They are normal stock at Digi-Key, but TI seems to have a shortage lately. I got some a couple of months ago. In the switch to ROHS compliant parts, I think there have been some supply interruptions, and not just with TI.

tool0.0book · 13th September 2006, 01:29 PM

Hi digi01.

Interesting design.nice work.

mcowher · 13th September 2006, 01:41 PM

Anyone have any extra BLD PCB's?

traw · 13th September 2006, 06:23 PM

hmmm... i had bought the ones of maxw here:
Balanced line pair

thought i was going to use them to bridge some opa549's, but might not gonna get around to it.

also, trying to make my own balanced driver via opamp. will see how that goes....

so...pm/email me and i'll pass them along for what i paid

mcowher · 13th September 2006, 08:04 PM

Awesome!

Unfortunately, I'm not allowed to PM just yet...You can email me at "mcowher(at)bellsouth.net" and I'll email you back...

mcowher · 13th September 2006, 09:41 PM

PM'd you Traw....

digi01 · 14th September 2006, 02:27 AM

Quote:

Originally posted by mcowher
Anyone have any extra BLD PCB's?

the project's cam file is free.please check my website.I am rebuild my site now,more information will be updated handly.

J

cliveb · 20th September 2006, 09:11 AM

Hi,

First post for me - please be gentle! I thought this thread would be the obvious place to post this question, as it concerns a balanced line driver using DRV134s. If anyone feels it belongs somewhere else, please let me know.

I've just built a BLD using DRV134s. (The only difference in my layout compared to digi01's is that I'm running them from +/-12V rather than +/-15V, and have included the optional 10uF NP caps).

My problem is that the +Vout and -Vout signals are in phase. Since the purpose is to drive power amps with differential balanced inputs, this isn't good - the result is silence, of course!

Does anyone here know of any circumstance that would cause the DRV134's outputs to be in phase? Or have I just misunderstood what this chip is supposed to do? (I have previously successfully built BLDs using AD SSM2142s, but they are now hard to source and the DRV134 is reputed to be better).

Thanks,
Clive

cliveb · 20th September 2006, 04:50 PM

Please disregard my previous post.
I've done some more testing and the signals ARE out of phase, as should be expected. I am using a software 'scope, and was also using the PC as a signal generator. It seems that the 'scope must have been picking up the generated signal instead of the output of the line driver. Once I dragged in a second PC to act as signal generator, I discovered that the output is as it should be. My apologies to everyone. First post, too: how embarrassing

traw · 20th September 2006, 05:16 PM

not to be embarassed... challenge creates learning opportunity

it can be frustrating but then seems trivial afterwards. i often have hard time phrasing question so find myself asking simpler (seemingly stupid) questions just to trigger someone to expound in more thorough manner rather than just the simple answer with no path of deduction.have to ask something maybe trivial afterwards with struggle.

what pc probing software you using?...

20th September 2006, 09:11 AM	#88
cliveb diyAudio Member Join Date: Jun 2005 Location: Watford, UK	Question about phase Hi, First post for me - please be gentle! I thought this thread would be the obvious place to post this question, as it concerns a balanced line driver using DRV134s. If anyone feels it belongs somewhere else, please let me know. I've just built a BLD using DRV134s. (The only difference in my layout compared to digi01's is that I'm running them from +/-12V rather than +/-15V, and have included the optional 10uF NP caps). My problem is that the +Vout and -Vout signals are in phase. Since the purpose is to drive power amps with differential balanced inputs, this isn't good - the result is silence, of course! Does anyone here know of any circumstance that would cause the DRV134's outputs to be in phase? Or have I just misunderstood what this chip is supposed to do? (I have previously successfully built BLDs using AD SSM2142s, but they are now hard to source and the DRV134 is reputed to be better). Thanks, Clive

20th September 2006, 04:50 PM	#89
cliveb diyAudio Member Join Date: Jun 2005 Location: Watford, UK	Sorry - my error Please disregard my previous post. I've done some more testing and the signals ARE out of phase, as should be expected. I am using a software 'scope, and was also using the PC as a signal generator. It seems that the 'scope must have been picking up the generated signal instead of the output of the line driver. Once I dragged in a second PC to act as signal generator, I discovered that the output is as it should be. My apologies to everyone. First post, too: how embarrassing

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13th September 2006, 01:29 PM	#82
tool0.0book diyAudio Member Join Date: Mar 2006 Location: Nantong,Jiangsu,China	Hi digi01. Interesting design.nice work.

13th September 2006, 01:41 PM	#83
mcowher diyAudio Member Join Date: Sep 2006	Anyone have any extra BLD PCB's?

13th September 2006, 06:23 PM	#84
traw diyAudio Member Join Date: Sep 2005	hmmm... i had bought the ones of maxw here: Balanced line pair thought i was going to use them to bridge some opa549's, but might not gonna get around to it. also, trying to make my own balanced driver via opamp. will see how that goes.... so...pm/email me and i'll pass them along for what i paid

13th September 2006, 08:04 PM	#85
mcowher diyAudio Member Join Date: Sep 2006	Awesome! Unfortunately, I'm not allowed to PM just yet...You can email me at "mcowher(at)bellsouth.net" and I'll email you back...

13th September 2006, 09:41 PM	#86
mcowher diyAudio Member Join Date: Sep 2006	PM'd you Traw....

20th September 2006, 05:16 PM	#90
traw diyAudio Member Join Date: Sep 2005	not to be embarassed... challenge creates learning opportunity it can be frustrating but then seems trivial afterwards. i often have hard time phrasing question so find myself asking simpler (seemingly stupid) questions just to trigger someone to expound in more thorough manner rather than just the simple answer with no path of deduction.have to ask something maybe trivial afterwards with struggle. what pc probing software you using?...

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