Car Speaker with arduino

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hi, i'm Álvaro , i'd me  :)

i have car speaker works 12v , 400hz, connected external power supply 12v speaker terminal, , other terminal connected collector of bd241a. base connected pin 9 of arduino provides 400hz pwm signal, , emitter connected ground (common external power , arduino)

my problem sounds low external ps, made me, max output current think 250ma.

so instead of eps connected airsoft battery of 8.4v , 1100mah (it can provide 2/3a it's written), , transistor burned.

what can making sounding louder? transistor can use doesn't burn?

greetings  ;)

you cannot drive transitor saturation.  (there heat)
use logic level n-channel mosfet.
https://www.sparkfun.com/products/10213
...for one


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