Lightspeed Attenuator needs a buffer??? Try these. - diyAudio
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Old 1st July 2011, 04:47 AM   #1
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Default Lightspeed Attenuator needs a buffer??? Try these.

If you have low input impedance poweramp <50kohm. And you would like to use Lightspeed Attenuator with it. It would be good to have a buffer after it. Here are 2 different very good value stereo buffers to use, one even has the power supply built in.
I had a customer use the simpler cheaper one and he said it was way better than any of the better opamp buffers he has tried and used.
It would be nice if someone could sim these to see what they like in a non real world.

STEREO FET BUFFER FOR DAC, PREAMPLIFIER, TAPE REC, ... (eBay item 380285512821 end time 03-Jul-11 00:09:41 AEST) : Business Industrial

STEREO NE5532 + DIAMOND BUFFER LINE LEVEL AMPLIFIER! (eBay item 150485089508 end time 22-Jul-11 13:56:55 AEST) : Consumer Electronics

Cheers George
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Old 1st July 2011, 08:07 AM   #2
jonners is offline jonners  United Kingdom
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I've used the first of those buffers and found it was good - pretty transparent. You have to be careful to check the connections: they are not labelled very clearly.

Last edited by jonners; 1st July 2011 at 08:09 AM. Reason: Typo
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Old 1st July 2011, 09:11 AM   #3
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I think I remember someone once saying it was Marantz HDAM buffer circuit. It's dc coupled throughout, did you get to measure the dc offset to see how low it was?

Cheers George
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Old 1st July 2011, 03:31 PM   #4
jonners is offline jonners  United Kingdom
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No I never measured the offset, and I don't have it set up now. I think I played safe and used a cap.
I'd be surprised if it was the HDAM circuit.
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Old 2nd July 2011, 12:03 PM   #5
Bernie7 is offline Bernie7  Singapore
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Would be great to know how this fet buffer performs against the B1.
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