[sdiy] Fans [was: Standalone PC synths]

[Harry Bissell Jr]

Yes (you are wrong on this :^)
  
  The problem is two-fold.
  
  1) The transformer magnetic field is coupled to the steel, causing a
  induced vibration
  
  2) The transformer core itself is magentostrictive (well they ALL are but this
  one is worse than most)... so the core itself will buzz anyway
  
  The fixes might be
  
  1) Aluminum top and bottom
  
  2) High quality Toroid transformer
  
  3) External power supply retrofit (wall wart anyone)
  
  (or 4... just kick back and BITCH about it... :^)
  
  H^) harry

Tim Parkhurst <tim.parkhurst at gmail.com> wrote:  On 1/16/06, WeAreAs1 at aol.com <WeAreAs1 at aol.com> wrote:  
In a message dated 1/16/06 10:00:15 AM,   seb at burnit.co.uk writes:


  Your Matrix 1000 has a fan?
Or do you just not like the sound coming from the audio out socket? :)  


Matrix  1000's (pretty much all of them) make an annoying mechanical  noise.  It's the power transformer, vibrating at  60/120/180/240/etc. Hz, mechanically coupled to the metal case, using  it as a resonating box.  Nice design, Oberheim.  

Mike B. 
  
I would think it would be pretty simple to mount the  transformer on some rubber pads and eliminate the problem altogether. A  seperate grounding wire could be added if necessary. Am I wrong on this?
 
  
Tim (wrong once or twice in the last decade) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein 
  

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