Input buffer for DRV134

Mrpong · 16th June 2006, 11:35 AM

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 !

CJ900RR · 16th June 2006, 12:11 PM

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..

reins · 16th June 2006, 12:41 PM

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

h_andree · 24th June 2006, 09:04 PM

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

Harry

lgreen · 24th June 2006, 11:21 PM

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

Mrpong · 27th June 2006, 06:29 AM

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?

CJ900RR · 29th June 2006, 03:07 PM

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.

mcowher · 7th September 2006, 02:12 PM

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?

xaudiox · 7th September 2006, 04:33 PM

hi mcowher,

i have a few of this chips, send me your address and will send you a couple..

mcowher · 7th September 2006, 07:11 PM

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!

24th June 2006, 09:04 PM	#4
h_andree diyAudio Member Join Date: Apr 2003 Location: New York	Buf 634 My pre-amp uses a Buf634. This drives the DRV134 very nicely. Harry

24th June 2006, 11:21 PM	#5
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	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 __________________ My DIY audio projects- PartTimeProjects.com.

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16th June 2006, 12:11 PM	#2
CJ900RR diyAudio Member Join Date: Jan 2006	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..

29th June 2006, 03:07 PM	#7
CJ900RR diyAudio Member Join Date: Jan 2006	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.

7th September 2006, 04:33 PM	#9
xaudiox diyAudio Member Join Date: Jul 2006	hi mcowher, i have a few of this chips, send me your address and will send you a couple..

7th September 2006, 07:11 PM	#10
mcowher diyAudio Member Join Date: Sep 2006	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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