Hi Pip,
Ah, sounds like a convenient little kit to canabalise. I noted that the LM386 is the amp that Keil use on the Eval board for the LPC2378, so I guess the circuit is tried and tested: http://www.keil.com/mcb2300/mcb2300-schematics.pdf
Comparing it with: http://www.maplin.co.uk/Media/PDFs/N48FL.pdf
I had a look at: http://www.national.com/ds/LM/LM386.pdf
It seems that as soon as you put a capacitor between pins 1 and 8 (as in the Maplin kit) the gain goes up by around 10x ... so you might want to leave pins 1 and 8 unconnected, i.e. dont fit R1 and C3. Looks like a coll little kit for £5... especially now it is so easy to play WAV files from and SD card... think I'll have to stop by Maplin
tomorrow :-)
Cheers,
chris
Hi there,
I'd like to drive an 8 ohm speaker from the mbed DAC. Can anyone recommend a circuit I can buy/build to do this, powering from the 5v USB out? Or will I need an external power supply :(
Kind Regards,
Mike