Instructables

Portable native MOD player based on Raspberry PI (plays MOD,S3M,IT,XM etc...). Uses BassPlay library.

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Step 2: Hardware part - power supply

In the prototype, battery consists of 4 AAA Ni-MH cells as AA Ni-CD cells wouldn't fit.
I use universal charger intended mainly for RC models to charge Ni-MH cells but if you possess only charger for AA Ni-Cd cells then I'd suggest to stick to these.
Raspberry operates safely on 4.8V so 4 AA or AAA 1.2V calls may be used.
You need a micro-usb connector to power raspberry as designed.
 
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