sound synthesizer

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Bloody-orc

Senior Member
Hello
has anyone got the schematic for that part that is being sold by rev ed? or maybe could tell me what chips it uses? i'ld like to make one my own.
 
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ylp88

Senior Member
Not really an everyday hobbyist project:
- Winbond WT701EM/T (Male)
- PIC16F872
- ST232C
- LM386M

All of the parts on the board are SMD, except the audio output bypass capacitor (220uF 10V electrolytic)

The Winbond chip has 56 pins - 28 downs two parallel sides. This edge is 14mm longs, so the pin pitch is 0.5mm. If you can make good UV transfers (or are willing to pay a PCB manufacturer to do it for you), then this might be possible. I'm not sure where you can buy the Winbond chip from, although the others are quite easy to source.

There is also an SMC crystal 24.576(MHz?) and what looks like a 6-pin resonator (do they exists - maybe; maybe not) - I might be mistaking it for something else, but it does say 8.000M on it, which seems suitable as a crystal/resonator speed.

Good luck and let us know if you do manage to make one!

<b><i>ylp88 </b> </i>
 
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andrewpro

New Member
Not having, nor ever having seen, the board this is all conjecture of course...

Re: the 6 pin resonator...is it a cubical type thing (or rectangular surface mount?). If so, it could be a VCO or SAW ceramic resonator. If it's a SIP type package, it could also be a ceramic filter. I could also be way off base in which case jsut ignore me all together <img src="smile.gif" width=15 height=15 align=middle>

--Andy P

Edit: Deleted the thing about the 8khz, as I missed that there was an M at the end of the marking the first time around!

Edited by - andypro on 21/06/2006 03:15:45
 
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ylp88

Senior Member
Upon close inspection, the &quot;thing&quot; looks like a thin piece of white plastic (0.5-0.75mm) on which sits a small metal encapsulation about 1mm high. It's dimensions are about 3mm x 7mm. It has three legs down each side (the 7mm side). Two of the leads go to pin 9 and 10 of the PIC, so I think it is some oscillator of some sort... I've only ever seen one SAW resonator before - it was a lot bigger! But that doesn't mean it's not, of course!

<b><i>ylp88 </b> </i>
 
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Fowkc

Senior Member
Download spe03.exe from:

http://www.rev-ed.co.uk/software/spe03.exe

The &quot;test&quot; buttons let you hear what the module would produce.

Edited by - Fowkc on 21/06/2006 19:49:51
 
hippy

hippy

Ex-Staff (retired)
Bloody-Orc/ylp88 : I think it's the WTS701. Google will turn up some circuits for its use, including this one ...

http://www.acfr.usyd.edu.au/teaching/3rd-year/mech3701-Mx3/reference/chips/Winbond/TTS%20Design.pdf

erdc : Ditto Google again for samples, including ...

http://www.warburtech.com/modules/sp03.speech.synthesizer/
 
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Bloody-orc

Senior Member
Thanks a bunch for all those replys. now i'm off to hunt down this WTS701 chip... seems to be a bit hard to find in local shops...
 
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ljg

New Member
here's a challenge. If you really want to try a DIY solution, take a look at romanblack.com (EE-Draw fame).

He's got a 1 bit-string sound synthesizer that requires only a PIC, a resistor, and a cap to feed into an amp that will produce pretty nice sound.

The site includes software to convert WAV files into the required bit strings. I wonder if just feeding the resulting bit file to a serial Eprom and using SEROUT to output to an LM386 amplifier would do it?

Any idea how to tune the BAUD rate to the cap and resistor sizes?
 
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