Electronics Festival cd-player?!

Hey Tech'ers.

Me and some friends decided to visit a festival in Denmark this summer, and instantly i felt like building my own festival-radio/cd player.

Only, im not sure how this is done :S. From what i could find from my research a cat-battery should be doable as long as we're talking a few days. Then i need a couple of speakers, and a car-radio with a CD-player.

Also, since it's a festival, there will be recharging-shops for cell phones. I read somewhere that these places will also be able to recharge my carbattery? How is this possible? Should i use a transformer to get the right voltage outcome or?

I hope someone got some experience with this

If there's a better solution please tell me And btw. i wont bring a ghettoblaster i need VOOOOOLLLUUUUMMEEEE

Greets IK

 

I saw an idea at diyAudio only yesterday,

The Class 'D' T-Amps are more efficient than the Class 'B' in most car radio amps so the battery will last longer between charges. Forget CD's, use an MP3 player.

 

Great idea, but not alot of information about his powersupplies etc.

 

I'd go for sealed lead acid (SLA), a 7Ah or 12Ah one would fit in the bag and be much lighter than the average car battery.

 

To be honest, i'm not a wiz at electronics. A car bettery seemed pretty straigth ahead, and also pretty cheap.

But ill try to look into the other battery type. Could you tell me where a could find such battery? Is it used in cars/scooters or where should i look for one?

 

yes, SLAs are typically used in scooters and wheelchairs, not sure where you could get some in denmark, and I'm sure shipping them wouldnt be too cheap either

 

Then im going for car batteries I know i can get 'em fairly cheap, plus they will be easier to recharge and stuff.

 

You should find a source of SLA's easy enough, they're used as back-up power in security alarms and anywhere else Nicads aren't enough capacity (or too expensive). But with the reduced capacity compared to car batteries a special charger would be needed, and standard car batteries are cheaper per Ah if the weight isn't a problem.

 

The weight isnt really a problem eigther. I have to pull it (yes its on a wagon) like 2 km. TOPS.

 

Mount it all in a wheeled Ice Chest. Get one of the solar panels designed for cars that trickle charge a car battery.