A/C Compressor Zener Diode to stop radio popping
urq at pacbell.net
Sat May 9 09:32:24 PDT 2009
.... sorry it took a while to get to this Ken,
I would recommend that you look into the "SA15A" transient suppressor,
manufactured by several sources ... Littelfuse, Fairchild ...
I did a quick web search ... many places (like DigiKey) have an outrageous
minimum quantity ... far too many for even a group buy. I did find a
retailer who would sell them individually for $0.69 and seem to be offering
a no minimum order sale ...
I have never done business with this company, so I can't vouch for them ...
you may want to call them rather than placing an on line order. They do
indicate they've been around a while, and they have an office in the USA.
I may look into doing this mod on the V8s ... assuming they are prior to the
VIN break Scott mentioned. If I do this I'll document it for others. For
those DIYing this be aware that the device is directional
You may want to look for one of the factory parts in a car in a wrecking
yard ... I doubt it would be something a person would specifically seek.
Your follow on question asked if the mod will work for other non-factory
stereos ... if you are hearing a pop when the compressor is switched the
answer would be yes, it will likely help you too. Some stereos may do a
better job of filtering power transients. The compressor clutch is the
source of the noise, it is a large inductive source, so when power is
applied and removed a transient is generated.
HTH and IUD!
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
Has anyone done the mod? It's described here:
More information about the quattro