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 Forum index » DIY Hardware and Software
Not sure if I have a technical problem or not
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Benjamin AM



Joined: Nov 04, 2010
Posts: 66
Location: Boise

PostPosted: Tue Nov 22, 2011 9:42 am    Post subject: Not sure if I have a technical problem or not Reply with quote  Mark this post and the followings unread

Hello,
I was inside my homemade modular system the other night rearranging a few things and I noticed when I turned my amplifier to maximum volume , my oscillators seemed to create a bit of noise on the ground(So I think). To isolate this "problem", I unplugged all of my other modules except one oscillator and one VCA. The oscillators audio path was not plugged into the VCA. The VCA was then plugged into my amplifier so I could listen but I also took the amplifier signal and sent it to an oscilloscope. When the amp was cranked up to 10 and the two modules plugged into the power bus directly next to one another, I noticed an audible oscillation(could be modulated by front panal voltages). At this point, the noise appeared in the form of a ramp wave on the scope at .02 V per division setting. When I moved the VCAs power connector away from the VCO on the bus the noise severely dropped.
I am curious if this is normal. Afterall, the amplifier was crank to a level at which I would never play it because the synths output is the standard 10V pp. I would like to solve this problem if it could lead to more problems down the road
Thanks
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Mongo1



Joined: Aug 11, 2011
Posts: 411
Location: Raleigh NC

PostPosted: Tue Nov 22, 2011 1:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

It doesn't sound like a big issue to me- amplifiers are great at taking little things and making them bigger, and if you give an amplifier any sort of path from it's output to its input it becomes an oscillator.

I'd say just leave it alone unless it manifests itself under normal conditions.

Gary

(BTW - when I read your post I thought of that old Henny Youngman joke - A guy walks into the doctor and says "Doctor - it hurts when I do THIS." - the doctor says "Well don't DO that")
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