speaker isolation
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Posted by Ivan Sedneff on January 30, 2006, 6:51 pm
Please log in for more thread options Hello, I made a portable enclosure for a car radio that has a negative ground but the left and right speaker outputs have isolated grounds from each other and the chassis. I needed to common out the (-) from the left and right speakers in order to attach them to the common connection on the headphone jack. I successfully connected each of the (-) outputs from the left and right speakers using non-polarized 47 uf electrolytic capacitors and joined the ends of the caps to the headphone jack. All is well when the jack is floating and un mounted, but when I mount the jack to the chassis, even though the audio output is great, I get annoying loud "clicks" and "pops" when I wiggle the headphone plug/jack, most likely because of the caps discharging/charging. Other than figuring a way to physically isolate the headphone jack from the chassis, is there a way to drain the charge using resistors, and if so, what values do you suggest? Thank you for your help, Ivan | ||||||||||||||||
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Posted by Joseph2k on February 4, 2006, 4:12 pm
Please log in for more thread options Ivan Sedneff wrote: -- JosephKK Gegen dummheit kampfen Die Gotter Selbst, vergebens. --Shiller | ||||||||||||||||
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>
> I made a portable enclosure for a car radio that has a negative ground
> but the left and right speaker outputs have isolated grounds from each
> other and the chassis.
>
> I needed to common out the (-) from the left and right speakers in
> order to attach them to the common connection on the headphone jack. I
> successfully connected each of the (-) outputs from the left and right
> speakers using non-polarized 47 uf electrolytic capacitors and joined
> the ends of the caps to the headphone jack.
>
> All is well when the jack is floating and un mounted, but when I mount
> the jack to the chassis, even though the audio output is great, I get
> annoying loud "clicks" and "pops" when I wiggle the headphone
> plug/jack, most likely because of the caps discharging/charging.
>
> Other than figuring a way to physically isolate the headphone jack
> from the chassis, is there a way to drain the charge using resistors,
> and if so, what values do you suggest?
>
>
> Thank you for your help,
>
> Ivan