Starting a buffer project

enter · 5th April 2006, 03:12 PM

HI

I want to start a project and i am thinking of a buffer.The main reason for this is that i want to use it betwwin my cd player,pc-soundcard and my amps(1paire rev a, 1paire rev c) for passive bi-amping the 2 front speakers.I am planing to use two y type rca connectors from the source to the buffer and from the one amp output (rev a) to the woofers and from the other amp (rev c) to the mid,tweters.My amps input input impedance is 100K.
Is the use of a buffer critical here?
Is the y rca connectors a good choice?Is there a beter way to go?
What schematic will you recommend simple to build ONLY WITH OPAMPS?

Thanks

enter · 10th April 2006, 06:56 AM

Nothing to say?

Leolabs · 11th April 2006, 02:40 AM

try to search on "OPAMP as buffer".

Spasticteapot · 11th April 2006, 03:34 AM

I'm hoping to use Decibel Dungeon's schematic for a discrete buffer. It's simple, and supposed to be quite good.

lndm · 11th April 2006, 12:31 PM

You may not need a buffer unless one of the amps has a low input impedance.

An easy op amp circuit would be a versatile preamp kit from a general electronics shop. They should also have a power supply kit.

If you feel up to it thought, try spasticteapot's idea first.

enter · 12th April 2006, 07:35 PM

Hi

Many thanks to all for replying

I did passive bi-amp my speakers without the use of a buffer and i have to say there is NO WAY BACK!!!I can now hear sounds in some tracks that i didint hear befor.The dynamics are far more beter.Although i spend some hard time to adjust the polaritys after that i was very pleased with the result.
Something i cant understan is that i had to connect the right speaker tweter in reverse otherwise the high frequencys was cliping with the volume at half.Any ideas way???
I am very curious if the buffer will inprove more.I will tray it wen i find the time to make the buffer from Dungeon's schematic.

PMA · 13th April 2006, 06:17 AM

Quote:

Originally posted by enter
HI

I want to start a project and i am thinking of a buffer.

What schematic will you recommend simple to build ONLY WITH OPAMPS?

Thanks

enter,

Check my website.

Pavel

dsavitsk · 13th April 2006, 06:38 AM

Quote:

Originally posted by Spasticteapot
I'm hoping to use Decibel Dungeon's schematic for a discrete buffer. It's simple, and supposed to be quite good.

You might want to check some modifications I made to it. http://www.ecp.cc/ss-bpp.html (note: as of 4/13.06 there is a bug in the board on my site that needs ot be fixed.)

5th April 2006, 03:12 PM	#1
enter diyAudio Member Join Date: Jun 2005 Location: Athens	Starting a buffer project HI I want to start a project and i am thinking of a buffer.The main reason for this is that i want to use it betwwin my cd player,pc-soundcard and my amps(1paire rev a, 1paire rev c) for passive bi-amping the 2 front speakers.I am planing to use two y type rca connectors from the source to the buffer and from the one amp output (rev a) to the woofers and from the other amp (rev c) to the mid,tweters.My amps input input impedance is 100K. Is the use of a buffer critical here? Is the y rca connectors a good choice?Is there a beter way to go? What schematic will you recommend simple to build ONLY WITH OPAMPS? Thanks

12th April 2006, 07:35 PM	#6
enter diyAudio Member Join Date: Jun 2005 Location: Athens	No way back... Hi Many thanks to all for replying I did passive bi-amp my speakers without the use of a buffer and i have to say there is NO WAY BACK!!!I can now hear sounds in some tracks that i didint hear befor.The dynamics are far more beter.Although i spend some hard time to adjust the polaritys after that i was very pleased with the result. Something i cant understan is that i had to connect the right speaker tweter in reverse otherwise the high frequencys was cliping with the volume at half.Any ideas way??? I am very curious if the buffer will inprove more.I will tray it wen i find the time to make the buffer from Dungeon's schematic.

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10th April 2006, 06:56 AM	#2
enter diyAudio Member Join Date: Jun 2005 Location: Athens	Nothing to say?

11th April 2006, 02:40 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	try to search on "OPAMP as buffer".

11th April 2006, 03:34 AM	#4
Spasticteapot diyAudio Member Join Date: Jan 2006 Location: Wisconsin....what did you expect?	I'm hoping to use Decibel Dungeon's schematic for a discrete buffer. It's simple, and supposed to be quite good.

11th April 2006, 12:31 PM	#5
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	You may not need a buffer unless one of the amps has a low input impedance. An easy op amp circuit would be a versatile preamp kit from a general electronics shop. They should also have a power supply kit. If you feel up to it thought, try spasticteapot's idea first.

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