[sdiy] passive pan pedal noise

[peter edwards]

Thanks for the input guys. looks like I have some reading to do. :-)
-pete

On Feb 17, 2009, at 10:18 PM, Stewart Pye wrote:

> Hi Pete,
>
> Guitar guys have this problem all the time. If you do a search on  
> diystompboxes.com you'll find threads related to it. There should  
> be a schematic on geofex.com.
>
> Basically you need to isolate the ground going to the guitar amps.  
> The best way to do it would be to have an op amp buffer driving an  
> isolation transformer on the output of each of the pots.
>
> Cheers,
> Stew.
>
> peter edwards wrote:
>> I'm working on a pan pedal for my synth and I've encountered a  
>> strange noise issue that has me stumped.
>> What I want to do is send my synth out to two different guitar  
>> amps. I'm using a reconfigured passive, stereo, volume pedal to  
>> fade between the the two amps.
>> The synth signal goes in one jack, then splits to the two sets of  
>> lugs on the stereo 100k pot. The two sets are wired as normal  
>> passive volume controls in opposite configurations so when one is  
>> turned up, the other turns down. The problem is when I plug the  
>> two outputs to two different amps I get line noise. When I use  
>> one, it works fine, when I plug in the second amp I get  line  
>> noise. It's not extremely loud, but it's noticeable/too loud.
>> I've tried different amps and switched the configurations, but I'm  
>> still getting the same effect.
>> any thoughts??
>> Thanks!
>> -pete
>>
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>