Hi
I've just embarked on a project where I need to broadcast an mp3 or wav file at intervals at loud volume in a remote setting. My attempt at a solution has been to hack an mp3 player, take the signal to a 12v car amp IC and output to a horn speaker, all powered by a 12v deep cycle leisure battery.
I opened a cheap mp3 player and found a Li battery at around 4.5v. So I removed the Li battery and wired an adjustable dc dc converter to step down from 12v and ran the mp3 from the resulting output. I wired the 12v amp IC on a parallel circuit from the same leisure battery.
I still managed to fry the mp3 player with this set up. Can anyone shed light on why this occured? Presumably the frying is a result of current overload. Is this because of the draw on the battery from the 12v part of the circuit? I noticed that the dc dc converter is described as non isolating. Is thee such a thing as an isolating converter, and would this allow tje mp3 to funtion in its own little world protected from large voltages and currents on the other side of the converter?
I did have a few other problems with the circuit before the mp3 blew- like getting the correct wiring for a sinlge audio input and speaker output on the tda7370 amp but I'll take this one step at a time! My rudimentary electronics seemed fine in theory but converting it to a practical circiut seems to be getting more complicated- I would be very grateful of any help or ideas - maybe theres a completely different way to approach this!
I've just embarked on a project where I need to broadcast an mp3 or wav file at intervals at loud volume in a remote setting. My attempt at a solution has been to hack an mp3 player, take the signal to a 12v car amp IC and output to a horn speaker, all powered by a 12v deep cycle leisure battery.
I opened a cheap mp3 player and found a Li battery at around 4.5v. So I removed the Li battery and wired an adjustable dc dc converter to step down from 12v and ran the mp3 from the resulting output. I wired the 12v amp IC on a parallel circuit from the same leisure battery.
I still managed to fry the mp3 player with this set up. Can anyone shed light on why this occured? Presumably the frying is a result of current overload. Is this because of the draw on the battery from the 12v part of the circuit? I noticed that the dc dc converter is described as non isolating. Is thee such a thing as an isolating converter, and would this allow tje mp3 to funtion in its own little world protected from large voltages and currents on the other side of the converter?
I did have a few other problems with the circuit before the mp3 blew- like getting the correct wiring for a sinlge audio input and speaker output on the tda7370 amp but I'll take this one step at a time! My rudimentary electronics seemed fine in theory but converting it to a practical circiut seems to be getting more complicated- I would be very grateful of any help or ideas - maybe theres a completely different way to approach this!