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Circuitbenders Forum => Circuitbending discussion => BENDING TIPS => Topic started by: okclave on March 14, 2012, 12:01:41 PM

Title: LTC1799 tuning problem
Post by: okclave on March 14, 2012, 12:01:41 PM

Hello!
So I've installed the LTC1799 on my Yamaha Vss-30. Brillant!
I actually have a 4 way rotary switch where I can select between the original clock and 3 octaves with the LTC1799 and a pot that acts as a pitch bend.
So I've got my octaves right and everything, but the funny thin is that if i touch the keyboard in the back or even the pot (it's got a plastic know) the tune seems to drop down... just by touching it!!
Is there any good way of isolating the circuit or doing something so it stays in tune?

I hope i was clear enough!
Cheers
Ezequiel

Title: Re: LTC1799 tuning problem
Post by: Gordonjcp on March 14, 2012, 12:40:53 PM

Sounds like hand capacitance.  You are a big wet bag of squashy conductive stuff.  You are pretty much grounded.  If you wave your hand near an oscillator, you act as one "plate" of a capacitor to ground.

You could try using screened cable to hook up your switches, and keep the leads as short as possible.