[time-nuts] Phase noise measurement (was - no subject)
Bob Camp
lists at rtty.us
Sat Aug 21 16:29:23 UTC 2010
Hi
A simple gain of 20 (26 db) amp using an OP-37 does a pretty good job in front of a spectrum analyzer. For a sound card you need more gain.
Bob
On Aug 21, 2010, at 11:42 AM, dk4xp at arcor.de wrote:
>
>> Wenzel Audio Amp referred to in this email. Perfect! I drive with it a
>> 3561A and a 7L5! Works for me. The only problem is getting any more
>> 2SK369.
>> Any recommendations?
>
> NXP BF862, available from digi-key.
>
> I have used it in a similar hookup with good success. Its virtue is the
> low noise voltage AND low input capacitance at the same time.
> You could deploy MANY of them in parallel until you get
> into the capacitance range of a single Interfet device.
>
> One heroic effort for audio is here: http://www.diy-audio-engineering.org/index.php?board=2.0 HPS5.1
>
> I currently use 3 pairs of SSM2210 in front of a AD797.
>
> regards, Gerhard
>
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