Input buffer for DRV134 - diyAudio
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Old 16th June 2006, 11:35 AM   #1
Mrpong is offline Mrpong  Thailand
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Default Input buffer for DRV134

Hi, I'm building a bridged LM3875 in bridge mode using DRV134. Is an input stage necessary for DRV134? I searched DIYAUDIO and came across this schematic in the thread Gainclone super symmetry.

GC SuperSymmetry

Has anybody tried this circuit? Does it make any differences?

Thank you !
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Old 16th June 2006, 12:11 PM   #2
CJ900RR is offline CJ900RR  Sweden
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Well i have some samples of the DRV134 at work and read in the datasheet (building personal DIY at work makes time fly ) just 2 hours ago that a OP or buffer is recomended.

Quote DRV134 datasheet page 10, Layout Considerations:

"The DRV134 input should be driven by a low impedance source such as an op amp or buffer "

Regarding the circut, sorry cant help. Have not build it..
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Old 16th June 2006, 12:41 PM   #3
reins is offline reins  Germany
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Quote:
Originally posted by CJ900RR
Well i have some samples of the DRV134 at work and read in the datasheet (building personal DIY at work makes time fly ) just 2 hours ago that a OP or buffer is recomended.

Quote DRV134 datasheet page 10, Layout Considerations:

"The DRV134 input should be driven by a low impedance source such as an op amp or buffer "

Regarding the circut, sorry cant help. Have not build it..
I expirienced that the DVR134 gets noisy if it isn't driven by low impedance. I drive it with a OPA134.

stephanr
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Old 24th June 2006, 09:04 PM   #4
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Default Buf 634

My pre-amp uses a Buf634. This drives
the DRV134 very nicely.

Harry
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Old 24th June 2006, 11:21 PM   #5
lgreen is offline lgreen  United States
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I've used the DRV134 by itself, in both my bosoz and in my iPod differential driver. No problems.

In bosoz, its driven by whatever source is connected (like a cd player)

In iPod differential driver, its driven by the iPod.

Here is the Link
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Old 27th June 2006, 06:29 AM   #6
Mrpong is offline Mrpong  Thailand
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Default Re: Buf 634

Thank you everyone for useful feedbacks.

Quote:
Originally posted by h_andree
My pre-amp uses a Buf634. This drives
the DRV134 very nicely.

Harry
Hi Harry, do you mean Burrbrown's BUF634P? How did you hook it to DRV134? Any schematic please?
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Old 29th June 2006, 03:07 PM   #7
CJ900RR is offline CJ900RR  Sweden
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I use the OPA2277, or the OP200, or the TL072, or the 2134. I havn't decided yet witch OP that suits my need's

But. Here is a schematic you can use, made my a guy called Nagref at a swedish forum, www.faktiskt.se .

Schematic

Component list

It's really a preamp made for the OPA2134, but you can use almost every other Dual OP you want.

Then you take the out-signal from one channel at the preamp and hook it in to the DRV134, pin 4, Gnd to Gnd (pin 3). V+ to pin 6, V- to pin 5.

Then pin 1 and 2 goes to one amp's input, pin 7 and 8 to the other amp. From the amp's you take the out positive signal only and hook it up to one loudspeaker. First amp positive to loudspeaker positiv, seccond amp positive to loudspeaker negative.

Ok?

Just use the basic schematic in BurrBrown/TIs datasheet, located here , page 8.
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Old 7th September 2006, 02:12 PM   #8
mcowher is offline mcowher  United States
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Quote:
Originally posted by CJ900RR
Well i have some samples of the DRV134 at work and read in the datasheet (building personal DIY at work makes time fly ) just 2 hours ago that a OP or buffer is recomended.
Do you still have any extra DRV134's?
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Old 7th September 2006, 04:33 PM   #9
xaudiox is offline xaudiox  Philippines
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hi mcowher,

i have a few of this chips, send me your address and will send you a couple..
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Old 7th September 2006, 07:11 PM   #10
mcowher is offline mcowher  United States
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I'm still not able to email people from the forums (my account is too new I guess). If you want, you can email me at "mcowher(at)bellsouth.net" and I can send you my mailing address.

Thanks!
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