datripsta
Active Member
I'm fitting a Google Nexus 7 2013 with USB DAC feeding sound processor via optical. The processor feeds the amps ( just like an analog X Over). All in place of command 2.0, All factory fitted stuff has been bypassed with new speakers. All works well except a load pop when I start the car. I've yet to mount the nexus in the dash which is the next job once I sort out the popping sound.
I'm using the live feed from the cig lighter as this goes on / off with ignition - this 12v ignition live feeds a relay which is then feeding all units with remote on off and a further daisy chained relay to same cig lighter feed which gives 12v switched power ( eg the USB port which the nexus is connected to for power with OTG cable - the nexus is set up to turn on and off when it sees or loses power on the USB ) - because I have a custom Kernal loaded on the Nexus that goes into deep sleep I don't need 12v permanent live as Nexus uses battery ( will last 2-3 weeks in this sate ) to be fair right now I'm using a USB cig lighter charger rather than the hard wired USB just because its easier until I mount the Nexus in the dash.
The issue is when starting then car the voltage cuts for a spit second which is causing the pop sound down the speakers. The sound processor has a short delay built in but its not long enough for the glow plugs to warm up in the morning so I get the pop hen I start and its bloody loud !
Does an "always on" 12v ignition live feed exist on a W210 CDI. A feed that's not cut when the car starts but goes off with ignition. As I've got the relays set up I just need something that will trigger the relay to go on when ignition is on but not cut when the car starts.
Failing this would some kind of capacitor work - something to hold enough charge to prevent the blip in power. If this will work anyone know what I would need ?
The fun will begin when I link up to the steering wheel controls ......
TIA
I'm using the live feed from the cig lighter as this goes on / off with ignition - this 12v ignition live feeds a relay which is then feeding all units with remote on off and a further daisy chained relay to same cig lighter feed which gives 12v switched power ( eg the USB port which the nexus is connected to for power with OTG cable - the nexus is set up to turn on and off when it sees or loses power on the USB ) - because I have a custom Kernal loaded on the Nexus that goes into deep sleep I don't need 12v permanent live as Nexus uses battery ( will last 2-3 weeks in this sate ) to be fair right now I'm using a USB cig lighter charger rather than the hard wired USB just because its easier until I mount the Nexus in the dash.
The issue is when starting then car the voltage cuts for a spit second which is causing the pop sound down the speakers. The sound processor has a short delay built in but its not long enough for the glow plugs to warm up in the morning so I get the pop hen I start and its bloody loud !
Does an "always on" 12v ignition live feed exist on a W210 CDI. A feed that's not cut when the car starts but goes off with ignition. As I've got the relays set up I just need something that will trigger the relay to go on when ignition is on but not cut when the car starts.
Failing this would some kind of capacitor work - something to hold enough charge to prevent the blip in power. If this will work anyone know what I would need ?
The fun will begin when I link up to the steering wheel controls ......
TIA