A/C Compressor Zener Diode to stop radio popping

Kenneth Keith auditude at gmail.com
Thu May 7 09:40:19 PDT 2009

Thanks Kneale.  Do you, or does anyone reading, know whether this is
only required/helpful with the factory sound system or is there/would
there be popping with aftermarket components as well?



On Thu, May 7, 2009 at 8:30 AM, kneale at coslink.net <kneale at coslink.net> wrote:
> I've done the Audi-suggested mod by purchasing their expensive harness with
> the Zenner attached.
> Bernie Benz probably has a cheaper approach available.
> Original Message:
> -----------------
> From: Kenneth Keith auditude at gmail.com>
> Hey Listers,
> Does anyone know where I can find the appropriate Zener Diode to use
> with the a/c compressor (patient is a 200q20v) to stop the feedback
> popping when the clutch cycles?  I found some on Mouser.com but they
> are sold by large quantities and I just need one.
> http://www.sjmautotechnik.com says it needs to be one with an 18v
> breakdown voltage.
> Has anyone done the mod?  It's described here:
> http://www.sjmautotechnik.com/trouble_shooting/elec.html#click
> Cheers,
> Kenneth

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