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<div class=3DSection1>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>> What does the 633 have that you =
cannot get
with a RC4200,</span></font><font size=3D2 color=3Dblack face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>> a LM13700 or a 1496 =
?</span></font><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier =
New";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>> Right, I see, minimum part count. =
But you
can solder a lot</span></font><font size=3D2 color=3Dblack =
face=3D"Courier New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>> of resistors in the time it takes to =
track
down such a rare chip.</span></font><font size=3D2 color=3Dblack =
face=3D"Courier New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>For a DIY yes, but when in commercial =
buissness,
no. Each trimmer is</span></font><font size=3D2 color=3Dblack =
face=3D"Courier New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>expensive then. Laser-trimming reduces =
the need.</span></font><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier =
New";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>></span></font><font size=3D2 =
color=3Dblack
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>If you want to make a ringmod without =
noticeable
bleedthru with a 633,</span></font><font size=3D2 color=3Dblack =
face=3D"Courier New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>you need trimmers, believe =
me.</span></font><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier =
New";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>And, if you want to do it with a LM13700, =
you
need MORE thn trimmers,</span></font><font size=3D2 color=3Dblack =
face=3D"Courier New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier New";color:black'>>you need a miracle (in my =
experience).</span></font><font
size=3D2 color=3Dblack face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:
"Courier =
New";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'><![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'><![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>I’ve made a couple of ring modulators from the Electro =
Harmonix circuit ‘frequency
analyser’ (633) that was translated in a Japanese magazine for use =
with a 1496.
They sound fine to me. I can GIF the circuit after the break if =
anyone’s
interested. Then again the 1496 is hardly cheap at about =
=A310.<o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'><![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>On the subject of CAD I’ve just started with Easy PC from =
Number One
Systems (Numberone.com- they’ll download/send a free version that =
doesn’t save
files). For the reasonable price (=A3100 for 500 pin max version) it =
seems fine
to me. The problem I’ve always had in the past is that you need to =
download a
manual with any free software which is usually like a small telephone =
book and
then if you get stuck you’ve got no support. The free versions =
often have bits
missing that are specifically designed to make you pay up in the end =
when you
get well stuck in. I guess I shouldn’t complain about free stuff =
but I farted
about for ages until I finally put my hand in my =
pocket…<o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'><![if =
!supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Lincoln<o:p></o:p></span></font></span></p>
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