[sdiy] Serial EPROM, sample playback

[Bob Devries]

What about using the PIC16C781? It has built-in DAC and ADC.
Manual (in PDF) here: http://ww1.microchip.com/downloads/en/DeviceDoc/41171a.pdf

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

  ----- Original Message ----- 
  From: Johannes Öberg 
  To: synth-diy at dropmix.xs4all.nl 
  Sent: Wednesday, December 07, 2005 3:57 PM
  Subject: [sdiy] Serial EPROM, sample playback


  Hi list!

  I'm making another sample-playback thingy. This time it's longer and reprogrammable (>=20 times) samples and better quality (>=3 secs, >=6bit 15khz or equiv.). It's a PIC 16F84 in the middle, and everything will run on batteries.

  What would be the best way to store the sample? I'm considering an SPI Flash EPROM, but it seems quite cumbersome to interface them with bitbanging. The I2C ones seems even worse. What's worse is I can only find surface-mount flash eproms. Therefor the programming would have to be in-circuit, and adding a PC interface on the PIC seems very difficult, not to mention it eats PIC legs. But maybe I'm wrong?

  What simple diy SPI Flash programmers exists? Preferably with DOS/Win software.

  What's done already that I should look at? How about trying to interface a parallell (E)EPROM with some help from a shiftregister? Would this eat alot of power?

  Also, would perhaps I2C be better? It does seem terrible for bitbanging, especially since I lack proper test equipment (I only have a slow scope and a DMM).

  I'm also concerned about the DAC. Since I'm low on free PIC pins, Roman Black's 1.5 bit DAC seems to be the most suitable. Anybody have any other suggestions I should look at?

  Any tips welcome!
  /Johannes



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