OESF Portables Forum

Model Specific Forums => Sharp Zaurus => Zaurus - pdaXrom => Topic started by: newkirk on January 28, 2007, 02:21:18 am

Title: Audio Always On?
Post by: newkirk on January 28, 2007, 02:21:18 am

I noticed something the other day.  I'm running r121 on my C860, and with the power 'off' I get noise on headphones when I'm jacking them in, giving me the impression that the audio circuit is live even when the Z is on standby.  Is this correct?

j

Title: Audio Always On?
Post by: gromituk on January 28, 2007, 03:36:01 pm

If you mean a tiny click when you plug them in, then that doesn't mean much.  Headphones are very sensitive and you can hear a very small current flowing.

Title: Audio Always On?
Post by: pelrun on January 28, 2007, 09:47:45 pm

It's not the audio circuit per se - the CE-RH1 remote requires a voltage to be present on the "key" pin in the socket, which for the C860 happens to be the sleeve (ground is first ring, which is backwards IMHO and was reversed in the Cxx00's).

A headphone jack will touch the tip and each ring against the live "key" while it's being inserted; this is what causes the crackling you hear.

It's still live when the Z is suspended so it is possible to unsuspend it using the remote; although I'm not sure pdaXrom is configured to take advantage of it.