<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>LM3900 to CD40XX Connection?</TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 5.50.4926.2500" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Hi Romeo,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I've currently got the circuit on my breadboard - I
used the 4016 simply because one was there, and my final version will have a
4016 stage available to it, but I can see why you'd want to avoid wasting an
entire 4016 on that one stage.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I just got back from the annual Stites
battle-the-swarm-of-Asian-beetles campout (damn transplanted species, anyway),
so I won't be able to get to it tonight, but I'll check to see if the circuit's
still working and then try an emitter-follower on it to see if it'll work with
that. I have a feeling it will - I imagine Don used the 4016 section on
there because it was available - left over from all that programmer
stuff.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Cheerio,</FONT></DIV>
<DIV><FONT face=Arial size=2>Scott</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE dir=ltr
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=RFahl@extensis.com href="mailto:RFahl@extensis.com">Fahl, Romeo</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> Friday, October 22, 2004 8:50
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [sdiy] LM3900 to CD40XX
Connection?</DIV>
<DIV><BR></DIV><!-- Converted from text/plain format -->
<P><FONT size=2>I'm taking a shot at cloning the Random Voltage Source from
the Buchla 208/Music Easel. You can see the schematic for it at this
URL:<BR><BR><A
href="http://www.takeonetech.de/buchi/magnus/synths/companies/buchla/Buchla_2080_2_200.jpg">http://www.takeonetech.de/buchi/magnus/synths/companies/buchla/Buchla_2080_2_200.jpg</A><BR><BR>In
the original, one LM3900 stage is used for the clock input, which is then
pumped into a CD4016 switch, which looks to me like it's being used as a
buffer. its output drives the clock input of the
CD4015. <BR><BR>I'm trying to avoid using a CD4016, since I have no need
for any other CMOS switches in the circuit. Could I simply use a
transistor buffer (Emitter Follower)
instead?<BR><BR>Romeo<BR><BR></FONT></P></BLOCKQUOTE></BODY></HTML>