Re: Power consumption-Hummmmm?

Often hum in these games is traced to power grounds doubling up as audio
grounds. Best to have them separate if possible, or solder BIG conductors
to ground paths. Experiment with a heavy alligator clipped wire..I found on
a number of audio boards (in the early days of pinball sound) that adding
an extra wire to the ground leg of a capacitor and routing it elsewhere on
the audio section would dramatically reduce hum. This would be a good forum
to report various successes of folks.

This sort of hum is not something that will show up on an volt/ohmmeter, we
are talking millivolts and micro-ohms at this point.

John :-#)#

At 02:22 PM 10/12/00, Clay Cowgill wrote:
>>But seriously, if you are going to wire a room please do yourself a favor and
>>try to keep the load balanced about both "phases" of the incoming 240 volts.
>>Will cost you a little less on power (power company meter is kinder to
>>balanced
>>loads, or so I've heard), and keeps surges to a minimum.
>
>The audiophile-looneys (sorry if I'm offending any audiophile-looneys out
>there ;-) are big on balanced power for reducing ground loop hum and noise.
>(Not *quite* the same as balancing both legs on the 240V service, but it's
>an interesting idea.) They tend to take 120V in and use a torroid to make
>two opposite taps each of 60V to run the electronics off of. I know I
>always seem to get hum out of my video games (Star Wars and Asteroids seem
>particularly finicky)-- might be interesting to see what one of those
>things would do for it...
>
>-Clay
>
>
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  John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
  Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
  http://www.flippers.com
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Received on Thu Oct 12 18:13:20 2000