using sansa clip+ in car

[bryguy]

Let me just say "me too" to this thread. The automatic on/off in the car with the charger is the killer app for Rockbox in my opinion, I've been using it with a Sansa c200 for years but the flash memory is finally going on my old one so I "upgraded" to a clip+. It mutes when you plug the power in via the car charger. I guess this isn't really a rockbox software problem, but it is a rockbox system problem.

[saratoga]

Does it work in the sandisk firmware? If not its probably an electrical problem with your car.

[Crafty]

Using a DC to DC converters that will isolate the car battery, imo is the best solution.  I would think there would be car power adapters with DC to DC isolation already to go but I did not find one for USB. 

I found a DC to DC converter clips from www.digikey.com under $20

Max input 18V
Min  input 9V
Output 12V @ 250ma

I've seen Clip battery at 270ma/h and 330ma/h (Clip Zip).  It look like they're being charged at 1/2C or 2hours.  250ma should be an overkill(?)  Would 12V @ 165ma work?
any comments?

http://www.digikey.com/product-detail/en/RS3-1212S/945-1564-5-ND/2321408

[Crafty]

Maybe using a car DC to 120VAC adapter and a 120VAC wall USB charger will work. 

Anybody tried that?

[nonob]

Maybe using a car DC to 120VAC adapter and a 120VAC wall USB charger will work.

 

I will try that.

Since my last post i had the same problem but under different conditions:

I have two speakers powered by usb port.If i plug it on the same device (my pc) from which i'm listening my music, the sound is muted, like in car.If i plug it on another device (another computer): no problem.

[Crafty]

it's not a car problem.  i check for volts across the output jack ground and usb ground:
1.25vdc not charging 
1.30vdc charging
output ground is floating.  When it's grounded to the car stereo it can't float. 

Removing the output grd shouldn't hurt anything as long as the car stereo input capacitors can filter that 1.30vdc.  only problem is:  output is effected by what ever ac noise in the car's power bus.

Removing the power ground is a "shot in the dark" risk.

Using a ground loop isolator may work.  For me that's a bandaid fix because it open the door for ac noise. 


 

[nonob]

Maybe using a car DC to 120VAC adapter and a 120VAC wall USB charger will work.

It works, but it isn't a good fix for me..

Removing the output grd shouldn't hurt anything as long as the car stereo input capacitors can filter that 1.30vdc.  only problem is:  output is effected by what ever ac noise in the car's power bus.

1-Unplugg audio ground only:

The sound is back but with noise.I can hear it very well when i do "pause" or when i listen quiet music.

Removing the power ground is a "shot in the dark" risk.

2-Unplugg power ground:

My sansa clip + rebooted and did a electronic overcurrent sound (not from audio but from player!!!!) , i've been afraid !!

I unplugg all very quickly!

Using a ground loop isolator may work.  For me that's a bandaid fix because it open the door for ac noise. 

An isolator on sound output or on power supply ?

[Crafty]

Maybe using a car DC to 120VAC adapter and a 120VAC wall USB charger will work.

It works, but it isn't a good fix for me..

What was the issue?

Using a ground loop isolator may work.  For me that's a bandaid fix because it open the door for ac noise. 

An isolator on sound output or on power supply ?

sound output.
I could not find a power supply isolator.   

[nonob]

Maybe using a car DC to 120VAC adapter and a 120VAC wall USB charger will work.

It works, but it isn't a good fix for me..

What was the issue?[/quote]

No technical issue but i don't want use a "big" dc/ac converter to charge my "very little" clip.

I could not find a power supply isolator.

And about the link above ?

I found that:

http://www.vpelec.com/fichiers/pdf/conversion-energie/convertisseur-dc-dc/ec-0027-convertisseur-dc-dc-20w-vp-electronique.pdf

http://www.minidsp.com/onlinestore/detail/8-accessories/flypage/81-minidc-isolator?sef=hcfp

[Crafty]

I could not find a power supply isolator.

And about the link above ?

I failed the 12vdc to 12vdc converter because on cost and hassle to make.  Digetkey does have 12vdc to 5vdc converters.  I really wanted something more end-user friendly.

I found that:

http://www.vpelec.com/fichiers/pdf/conversion-energie/convertisseur-dc-dc/ec-0027-convertisseur-dc-dc-20w-vp-electronique.pdf

http://www.minidsp.com/onlinestore/detail/8-accessories/flypage/81-minidc-isolator?sef=hcfp

http://www.vpelec.com/fichiers/pdf/conversion-energie/convertisseur-dc-dc/ec-0027-convertisseur-dc-dc-20w-vp-electronique.pdf

How much is this?  It's 4000ma out.  My guess >$100usd.  Is there a USA supplier?

http://www.minidsp.com/onlinestore/detail/8-accessories/flypage/81-minidc-isolator?sef=hcfp
 This one fails on output current...only 100ma@12v...me thinks.

[nonob]

http://www.vpelec.com/fichiers/pdf/conversion-energie/convertisseur-dc-dc/ec-0027-convertisseur-dc-dc-20w-vp-electronique.pdf

How much is this?  It's 4000ma out.  My guess >$100usd.  Is there a USA supplier?

I don't know, i've juste found the link ..