Punnisher
Headphoneus Supremus
- Joined
- Dec 4, 2007
- Posts
- 2,655
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- 41
I just made an ipod charging/line out dock (you can see it here http://www.head-fi.org/forums/f6/pos.../index312.html) with +5v going to pin 23 and common going to pin 16(pinout here Apple iPod dock interface pinout and signals @ pinouts.ru ) . This is sent through a switch so that I can turn the voltage on and off.
When using the line out with the +5 volts, there is a high pitched buzzing noise present. It isn't particularly noticeable unless I turn the volume up a good amount on my amp/receiver, but it definitely stops once I take away the +5v.
What would you recommend? The chassis is obviously well grounded, but perhaps I need to use a DC powersupply with a ground instead of just a 2 prong plug. Or maybe a ferrite core could help?
What about the supply voltage, is this the wrong place to send voltage for my purpose?
Any comments would be appreciated.
A friend just told me to try and isolate the audio ground from the chassis, sounds like it could be the answer.
When using the line out with the +5 volts, there is a high pitched buzzing noise present. It isn't particularly noticeable unless I turn the volume up a good amount on my amp/receiver, but it definitely stops once I take away the +5v.
What would you recommend? The chassis is obviously well grounded, but perhaps I need to use a DC powersupply with a ground instead of just a 2 prong plug. Or maybe a ferrite core could help?
What about the supply voltage, is this the wrong place to send voltage for my purpose?
Any comments would be appreciated.
A friend just told me to try and isolate the audio ground from the chassis, sounds like it could be the answer.