I have a system that comprises of a 12v battery, a little 7" LCD screen, and a cheapo chinese audio player and audio amp.
Everything works fine.
I want to replace the MP3 player and audio amp with the sparkfun MP3player and amp. As soon as I connect it, I get a thumping pulse from the speaker, at a frequency of about 2 or 3 per second.
It stops if I turn off the LCD screen, so I'm assuming its from that?
I've tried putting a 2200uf cap across the power at the amp end, and it very slightly muffles the pulsing, but not significantly.
I'd rather not run the audio from a separate battery for weight, so is there a 12v - 12v power noise reducing widget I can put in between the screen and the audio?
Or (as usual) it it not as simple as that?
Thanks for any advice!
Chris.
Everything works fine.
I want to replace the MP3 player and audio amp with the sparkfun MP3player and amp. As soon as I connect it, I get a thumping pulse from the speaker, at a frequency of about 2 or 3 per second.
It stops if I turn off the LCD screen, so I'm assuming its from that?
I've tried putting a 2200uf cap across the power at the amp end, and it very slightly muffles the pulsing, but not significantly.
I'd rather not run the audio from a separate battery for weight, so is there a 12v - 12v power noise reducing widget I can put in between the screen and the audio?
Or (as usual) it it not as simple as that?
Thanks for any advice!
Chris.