Quick mute switch query..

jethdub · 16th April 2008, 12:47 AM

Just been googling this for too long with no joy..

I'm playing with a project which involves a virtual earth mixing section with mute switches. I am at present just floating the source end of the mix resistors, rather than switching them to ground. It's only 4 channels so I figured noise gain differences not to be a problem, especially considering the specific application.

Problem is, though I have the channels fed from buffered sources with blocking caps on the outputs I am still getting clicks when engaging the switches.
Is the problem low quality switches or is the problem dc on the mixbus from the opamp output/feedback network...? If the latter I'm assuming a cap on the mix bus would get rid? (Bipolar due to lack of bias?)
I'm a relative newbie and stabbing in the dark so forgive me.. :-)

I'd appreciate it if anyone is around to give me a quick answer as I'd like to get some work done on this tonight while the mrs is out.. :-)
Thanks.

jethdub · 16th April 2008, 06:37 PM

Spent another couple of hours glued to google with no joy... anyone???

jethdub · 18th April 2008, 05:37 PM

Thanks anyway..problem solved..I had an intermittent connection on one of the pot wipers which was causing an open circuit.

CJ900RR · 19th April 2008, 11:08 PM

There you go!

Quote:

Swedish saying
Själv är bäste dräng

= self is best farmhand... or it's best to sometimes to solve things by your self.

16th April 2008, 12:47 AM	#1
jethdub diyAudio Member Join Date: Jan 2006 Location: Mexico, at present.	Quick mute switch query.. Just been googling this for too long with no joy.. I'm playing with a project which involves a virtual earth mixing section with mute switches. I am at present just floating the source end of the mix resistors, rather than switching them to ground. It's only 4 channels so I figured noise gain differences not to be a problem, especially considering the specific application. Problem is, though I have the channels fed from buffered sources with blocking caps on the outputs I am still getting clicks when engaging the switches. Is the problem low quality switches or is the problem dc on the mixbus from the opamp output/feedback network...? If the latter I'm assuming a cap on the mix bus would get rid? (Bipolar due to lack of bias?) I'm a relative newbie and stabbing in the dark so forgive me.. :-) I'd appreciate it if anyone is around to give me a quick answer as I'd like to get some work done on this tonight while the mrs is out.. :-) Thanks.

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16th April 2008, 06:37 PM	#2
jethdub diyAudio Member Join Date: Jan 2006 Location: Mexico, at present.	Spent another couple of hours glued to google with no joy... anyone???

18th April 2008, 05:37 PM	#3
jethdub diyAudio Member Join Date: Jan 2006 Location: Mexico, at present.	Thanks anyway..problem solved..I had an intermittent connection on one of the pot wipers which was causing an open circuit.