Attachment 'vcfmod.html'
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Visit the Site Map.'; return true;" ONMOUSEOUT="flip('map', 'map1'); window.status=''; return true;"><IMG SRC="images/barmnmap1.gif" NAME="map" ALT="Site Map" BORDER="0" HEIGHT="26" WIDTH="100"></A></TD> <TD VALIGN="middle" ALIGN="left" WIDTH="35"> <IMG SRC="/images/barrght.gif" ALT="" BORDER="0" HEIGHT="70" WIDTH="35"></TD> </TR> </TABLE> </CENTER> <HR NOSHADE> <CENTER> <FONT SIZE="4"> <B> Moog Micromoog/Multimoog DIY Modifications </B> </FONT> </CENTER> <HR NOSHADE WIDTH="400"> <CENTER> <FONT SIZE="3"> <B> VCF Modification </B> </FONT> </CENTER> <HR NOSHADE> <CENTER> <FONT SIZE="4"> <B> Written by: Michael Caloroso </B> </FONT> </CENTER> <HR NOSHADE> <P> <FONT SIZE="3"> Micromoogs and Multimoogs have always been adequate for lead lines and noise FX, but they have a "fault" that restricts their ability to deliver bass timbres a'la the classic Minimoog bass. The VCF has a cap on the audio input that provides DC isolation, but it also forms a high pass filter; on the Micro/Multi, the cap is not large enough to allow low frequency components to pass through. This is evident when you observe the change of the pulse waveform on a scope, as you switch the VCO octave from 8' to 32'. </FONT> </P> <P> <FONT SIZE="3"> This "fault" is easily fixed. Just parallel C506 with a 100uf 50v electrolytic cap. Refer to the attached pics for the location of the cap on the main board; it is located smack in the middle (Micromoog and Multimoog use the same main board). Make sure you observe the polarity of the cap and that you have sufficient clearance. I tack-soldered it on the underside on the PC board and </FONT> </P> <P> <FONT SIZE="3"> This lowers the cutoff frequency of the composite high pass filter formed by the input cap and associated impedances, and thus results in better bass response. I compared the modified Micromoog to the Minimoog, and the Micro can easily compete (on a one oscillator level, of course). </FONT> </P> <HR NOSHADE WIDTH="400"> <CENTER> <P> <IMG SRC="manuals/moog/micromoog/vcf_fix1.jpg"> </P> <FONT SIZE="3"> Image 1 </FONT> <P> <IMG SRC="manuals/moog/micromoog/vcf_fix2.jpg"> </P> <FONT SIZE="3"> Image 2 </FONT> </CENTER> <HR NOSHADE> <CENTER> <FONT SIZE="4"> <B> <A NAME="links">LINKS</A> </B> </FONT> <HR NOSHADE WIDTH="400"> <CENTER> No links at this time. </CENTER> <HR NOSHADE> <CENTER> <FONT SIZE="3"> <B> Thanks go out to the following people for their contributions to this page: </B> </FONT> <TABLE> <TR> <TD> <UL> <LI>Michael Caloroso </UL> </TD> </TR> </TABLE> </CENTER> <HR NOSHADE> <CENTER> <FONT SIZE="3"> <B> All images and text are copyright by their respective owners where applicable. </B> </FONT> </CENTER> <HR NOSHADE> <CENTER> <FONT SIZE="3"> <B> The Archive is always in search of more material. If you have anything that you feel would make a great addition, please feel free to contact the curator! He is always on the lookout for schematics of synths, drum machines, sequencers, effects, and about anything else you can think of! </B> </FONT> </CENTER> <HR NOSHADE WIDTH="400"> <CENTER> <FONT SIZE="4"> <B> Have any comments or suggestions? Send E-Mail to: </B> </FONT> </CENTER> <CENTER> <FONT SIZE="3"> <B> <A HREF="mailto:tom@sdiy.org" ONMOUSEOVER="window.status='Mail the curator!'; return true;" ONMOUSEOUT="window.status=''; return true;">tom@sdiy.org</A> </B> </FONT> </CENTER> <HR NOSHADE> <CENTER> <TABLE> <TR> <TD> <A HREF="http://validator.w3.org/" ONMOUSEOVER="window.status='Make HTML-compliant web pages! Look great on any browser!'; return true" ONMOUSEOUT="window.status=''; return true"> <IMG SRC="images/vh32.gif" ALT="W3C HTML 3.2 Checked!" BORDER="0"></A> </TD> </TR> </TABLE> <FONT SIZE="2"> <I> Last Updated 2-28-00 </I> </FONT> </CENTER> <CENTER> <FONT SIZE="1"> Copyright©2000 Tony Clark - No use without permission </FONT> </CENTER> </BODY> </HTML>
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