When i googling, i found this old scheme (re-drw for clarity) about audio clip player. it uses IC 555 timer, IC 4040 counter, IC EEPROM 27512, ResistorLadder DAC, and Mini Amplifier with 324 OP AMP to produce audio clip. hmm.. cute, i wish it can put on my bicycle to promo ice cream, bread, etc. Look like ringtone, ups i mean audiotone.
What about the wave data ?
Try to make from 8bit-mono *.wav file, use any audio converter (ex: winamp waveout) to convert from mp3 to wav. THe calculation, if use 8000hz sampling-rate and 64KB ROM so only 65536 byte / 8000 byte = 8 second !!! hmm...enough to say several word. for promo audio clip ?? see more his project at http://www.nishioka.com
how to re-presentate the percent. of duration ?
Use IC 4017.
input clock from A10 then lets the 4017 calculate the duration every 10% (4017 have 10 led or ) after 10 steps (or 8 steps in A11,A12,A13?) i will back to first led.
i Think it's cool behavior act like Knightrider LED.
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