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Old 15th March 2009, 11:28 AM   #11
EUVL is offline EUVL  Europe
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Default 4. Output Distortion Spectrum

..
Input signal 4V Pk-Pk Sine Wave
Power Supply +/- 9V
R load 2k

Green Input
Cyan Output


i.e. below the capability of my HandyScope3, as expected.
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Old 15th March 2009, 02:39 PM   #12
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Hi Patrick ,

thanx a lot !
i like this turbo very much ,
as always superb job !

Jürgen
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Old 15th March 2009, 04:32 PM   #13
EUVL is offline EUVL  Europe
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Pleasure.

For the first 3 persons who declare here their serious interest to build the DABF862, and promise to report their results within 2 months, I offer to send them each 2 PCB blanks, totally free of charge. The rest you can get from Digikey.




Patrick
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Old 15th March 2009, 07:09 PM   #14
BFNY is offline BFNY  United States
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I would like to try this, and will be happy to test it for how it sounds, as well as low level distortion, etc. Looks very interesting to me.

I am also interested in it for use as a buffer in filter circuits where multiple stages are used in series - i.e. in older DACs that employ bessel filters based on op-amps (GDA-700). Also in FM tuners pre and post MPX section where ones needs to filter as well.
Bob
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Old 15th March 2009, 07:48 PM   #15
EUVL is offline EUVL  Europe
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Send me a PM with your postal address.
I'll post them off in an envelope within the next week.

Patrick


PS I had a PM from another member agreeing to evaluate, so one allocation left. Steen ??



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Old 15th March 2009, 08:14 PM   #16
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That is an interesting replacement for opamps. I would like to try the buffer, I sent you a PM.
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Old 15th March 2009, 10:19 PM   #17
EUVL is offline EUVL  Europe
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I've been asked about matched BF862s.

I cannot provide any at the moment, as I have only limited left myself. But almost any electronic supplier has them at very reasonable price. Buy 10 and you will find 2+2 that adds to the same current. Good enough for the test.

When there is sufficient interest, I shall buy a bunch and make matched ones available. But not for the time being.


Patrick
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Old 16th March 2009, 02:27 AM   #18
BFNY is offline BFNY  United States
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Quote:
Originally posted by EUVL
Send me a PM with your postal address.
I'll post them off in an envelope within the next week.

Patrick


Thanks, PM sent. I assume a +/- 12 to 15V supply is OK?
I see these parts are rated 20V.

Bob
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Old 16th March 2009, 02:58 AM   #19
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Patrick,

This is a really interesting device. I'd like to try it.

There are a number of devices we can try it in, but 1st off the bat is as a buffer in the output of the HP of a PLLXO.

dave
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Old 16th March 2009, 06:07 AM   #20
EUVL is offline EUVL  Europe
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The 3 allocations are : Bob, Jean-Paul and Dave.

Dave you need to send me POSTAL Address.
And remember, you promised to report back within 2 months.




Patrick
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