----- Original Message ----- 
From: "Sean Breheny" <shb7@cornell.edu>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, January 01, 2009 9:35 PM
Subject: Re: [EE]: Sound generation options...


> Hi all,
>
> About 2 weeks ago I posted a message talking about a PIC-based
> synthesized music box I built about 4 years ago. I said that I could
> post code and schematic if people were interested. Several people
> asked for it but it took me a while to go back into my archives and
> pull it all together. In addition, the only schematic I had was a mess
> and was hand drawn. SO, I downloaded gEDA and had to learn to use its
> schematic editor so I could produce a better schematic.
>
> That's done now and you can download a ZIP file containing the docs at:
>
> http://www.cheapgalvis.com/mbox.zip
>
> This ZIP file contains the following:
>
> ASM code for the PIC in the device
> Two JPG images (sorry for the poor quality, back then I had a very
> poor digital camera) of the inside and outside of the device.
> C code for generating the HEX file to be programmed into the serial
> EEPROM chip in the device (contains the data for the tunes as well as
> sampled notes)
> PDF of the schematic.
>
> Please note that when I originally did this, I had only about two
> weeks within which to do it so it is not my best work (the comments in
> the code are rather sparse). I am also not 100% sure that nothing
> changed in the actual device compared to the schematic. This PDF
> contains what I have on paper and may be slightly different from what
> is in the actual device.
>
> If anyone needs further explanation, I'd be glad to answer questions.
> I can also provide a gEDA schematic file but since I am not entirely
> sure yet how to export it along with the necessary symbols I created,
> I did not put it in the ZIP file. Please refer to my message of Dec 17
> 2008 about this as well (text is copied below).
>
> Sean
>
Thank you Sean. A quick look makes this old novice wonder how you did all 
this in two weeks.

I've done some toll-quality audio (Mic>adc>spi save to EEPROM>dac>speaker), 
but never was happy with the audio quality. I hope studying what you have 
done will help me improve on that.

Thanks, again.

Richard



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