Circuitbenders Forum

Circuitbenders Forum => Drum machines => Circuitbending discussion => Roland & Boss => Topic started by: selfpreservation on March 17, 2011, 09:11:21 AM

Title: tr909 snare problem
Post by: selfpreservation on March 17, 2011, 09:11:21 AM

my tr909 snare sounds weird these days it sounds to me like the tom or "tune" part of the sound is ringing , ie not decaying i can see from the schematic that there are several envelopes used to make this sound and im guessing env 1 affects the tune could anyone give me any insight on where to start looking for faults ie which components that could be suspect , im guessing the capacitor in env1 or a  transistor , i just a bit reluctant to start blindly poking around inside such a valuable machine and i cant find anyone in a 100 mile radius that can fix it  :-[
here is the schematic of the snare
 (http://i1139.photobucket.com/albums/n551/ciaranbyrne606/tr909snare.jpg)

cheers ciaran

Title: Re: tr909 snare problem
Post by: electoyd on March 17, 2011, 12:03:28 PM

a sound sample would helpful for people to work out exactly what it is that is different about the sound- i would say tread with caution inside such a valuable machine, good luck.