Its certainly a good way to quickly check if anythings drastically wrong and
one could even compare them with a known source such as an LM317 based
regulator with no ADJ pin bypass. If one can hear the noise then its possible
that a sound card could make some meaningful measurements of the headphone amp
output.
John, do you have any specs for the supplies?It would be nice to know the
likely best case output noise level.
To measure the ripple of most supplies I usually just connect my USB scope (dc
coupled) to the supply output.This certainly works (with my 14 bit scope at
least) with E3610A/E3611A series supplies. For lower ripple supplies I use AC
coupling.
The 100Hz (in my case) ripple shows up nicely in the FFT.
Bruce
From: Poul-Henning Kamp <p...@phk.freebsd.dk>
To: Discussion of precise voltage measurement <volt-nuts@febo.com>; Brooke
Clarke <bro...@pacific.net>
Sent: Saturday, 2 July 2016 11:28 AM
Subject: Re: [volt-nuts] Practical power supply noise testing
--------
In message <5776e31d.7090...@pacific.net>, Brooke Clarke writes:
>Instead of headphones something like the HP 4395A [...]
Well, there is a slight difference in price there, isn't there ? :-)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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