The following 133 words could not be found in the dictionary of 615 words (including 615 LocalSpellingWords) and are highlighted below:

100uf   50v   ability   adequate   allow   always   and   associated   at   attached   attachment   audio   bass   been   better   board   but   by   C506   Caloroso   can   cap   classic   clearance   compared   compete   components   composite   contributions   course   cutoff   deliver   easily   electrolytic   enough   evident   fault   filter   fix1   fix2   fixed   following   for   formed   forms   frequency   from   go   high   image   image2   impedances   in   input   isolation   jpg   Just   la   large   lead   level   lines   links   located   location   low   lowers   main   Make   Manuals   Michael   Micro   Micromoog   Micromoogs   middle   Minimoog   Modification   Modifications   modified   Moog   Multi   Multimoog   Multimoogs   No   noise   observe   octave   of   on   one   oscillator   out   page   parallel   pass   people   pics   polarity   provides   pulse   Refer   response   restricts   results   same   scope   smack   soldered   sufficient   sure   switch   tack   Thanks   that   The   the   their   they   This   this   through   thus   timbres   time   to   underside   use   vcf   waveform   when   with   Written   you  

Clear message

Micromoog/Multimoog DIY Modifications

VCF Modification

Written by: Michael Caloroso

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'.

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

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).

image 1

image2

LINKS

No links at this time.

Thanks go out to the following people for their contributions to this page:

Michael Caloroso

MoogManuals/MicroMoog (last edited 2007-02-03 09:03:38 by TomArnold)