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<TITLE>Dual quantizer design on the web</TITLE>
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<P><FONT SIZE=2>If anyone is interested in my dual quantizer design, please look at <A HREF="http://www.hevanet.com/jspeth/DualQuantizer.htm" TARGET="_blank">http://www.hevanet.com/jspeth/DualQuantizer.htm</A>. I implemented this on a MOTM breadboard but it can be done on any form factor. Paul Schreiber (Mr MOTM) has offered many useful criticisms but it still works reasonably well. It's not prefectomundo MOTM however but that's a pretty high standard. Here are a few of his comments:</FONT></P>
<P><FONT SIZE=2>1. Better to use an ADC/MPU/SPI design since ADCs are much better today than 10 years ago.</FONT>
<BR><FONT SIZE=2>2. Using 78LXX voltage reg for reference is not a good idea.</FONT>
<BR><FONT SIZE=2>3. The use of comparators with hysteris leads you down the chatter vs. accuracy tradeoff that is bypassed if you use the ADC/MPU/DAC design.</FONT></P>
<P><FONT SIZE=2>4. SPI ADCs and DACs are better choices due to easier layout and frees up more pins on a PIC.</FONT>
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<P><FONT SIZE=2>I think the strongest feature of my design is the PIC and all the scaling possibilities it allows with a few simple circuit changes. Couple that with Paul's recommendations and you have a nice quantizer.</FONT></P>
<P><FONT SIZE=2>John Speth</FONT>
<BR><FONT SIZE=2>Molectron Detector, Inc.</FONT>
<BR><FONT SIZE=2><A HREF="http://www.molectron.com" TARGET="_blank">http://www.molectron.com</A></FONT>
<BR><FONT SIZE=2><A HREF="mailto:johns@molectron.com">mailto:johns@molectron.com</A> </FONT>
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