MP3 Player ~ Hardware


November 2014

The Circuit


The circuit is self-explanatory except, perhaps, for the connections to the 8 ohm loudspeaker. The MP3 module has two connection pins for a single speaker - SPK1 and SPK2. I've arranged it such that a pair of stereo headphones connect in the usual way - ie each channel is connected between either SPK1 or SPK2 and Ground. Removing the headphones plug connects the internal 8 ohm 0.1W speaker between SPK1 and SPK2 instead of connecting one side to ground.

The Printed Circuit Board




MOD-1021 MP3 micro-SD Audio Moduleembedded adventures SoundOut MP3 Audio Module
1" x 2.4" x 3.8" Enclosure (includes PP3 battery clip)Farnell
5-way Navigation Switch (ALPS - SKQUCAA010)Farnell, CPC, ebay
3.5mm switched stereo socketFarnell
MCP1702-3302E 3v3 LDO Low Quiescent regulatorFarnell
Miniature right-angle SPDT PCB mounting slide switch ebay
36mm dia. 8 ohm 0.15W loudspeaker Farnell, ebay
ATtiny84 ATMEL Microcontroller ebay
14-pin DIL socketebay
3mm LED, Resistors, 2 x 8 way pin headers,
1uF Electrolytic Capacitor, 47uF Electrolytic Capacitor


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