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<DIV><FONT face=Arial size=2>What about using the PIC16C781? It has built-in DAC
and ADC.</FONT></DIV>
<DIV><FONT face=Arial size=2>Manual (in PDF) here: <A
href="http://ww1.microchip.com/downloads/en/DeviceDoc/41171a.pdf">http://ww1.microchip.com/downloads/en/DeviceDoc/41171a.pdf</A></FONT></DIV>
<DIV> </DIV>
<DIV>--<BR>Regards, Bob Devries, Dalby, Queensland, Australia</DIV>
<DIV> </DIV>
<DIV>Isaiah 50:4 The sovereign Lord has given me<BR>the capacity to be his
spokesman,<BR>so that I know how to help the weary.</DIV>
<DIV> </DIV>
<DIV>website: <A
href="http://www.home.gil.com.au/~bdevasl">http://www.home.gil.com.au/~bdevasl</A><BR>my
blog: <A
href="http://bdevries.invigorated.org/">http://bdevries.invigorated.org/</A><BR></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=johannes.oberg@gmail.com
href="mailto:johannes.oberg@gmail.com">Johannes Öberg</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=synth-diy@dropmix.xs4all.nl
href="mailto:synth-diy@dropmix.xs4all.nl">synth-diy@dropmix.xs4all.nl</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, December 07, 2005 3:57
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [sdiy] Serial EPROM, sample
playback</DIV>
<DIV><BR></DIV>Hi list!<BR><BR>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.<BR><BR>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?<BR><BR>What
simple diy SPI Flash programmers exists? Preferably with DOS/Win
software.<BR><BR>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?<BR><BR>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).<BR><BR>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?<BR><BR>Any tips
welcome!<BR>/Johannes<BR>
<P>
<HR>
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