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Author Topic: Newbie neeing a bit of help - oscillator? 555?  (Read 2639 times)

robotic_pants

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Newbie neeing a bit of help - oscillator? 555?
« on: August 03, 2010, 02:37:21 PM »

Hello everyone,

I've just started bending and I need a bit of help. I've got a casio PT-87 and when I touch the edge of the chip quickly (making the connection oscillate i suppose) it makes this gorgeous kind of C64 wobbly sound. How to i make this into a bend, perhaps with a pot controlling the speed of the on-off oscillation? Would I be right in thinking I need a 555 timer chip? or some sort of oscillator circuit?

Thanks for your time,

robo_p

PS
I' moved this from the Toys section realising it was in the wrong place, oops.
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Gordonjcp

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Re: Newbie neeing a bit of help - oscillator? 555?
« Reply #1 on: August 03, 2010, 04:43:54 PM »

Your body acts as a big aerial, and picks up huge amounts of 50Hz hum from mains wiring.  This is the buzz you hear when you tap your finger on the end of a jack lead.  In this case you're feeding the mains noise into some sort of input on the chip.  Try to narrow down which pin it is on the chip that seems to be most affected.  Look up what the chip is on the 'net and see if you can identify what the pin does.
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robotic_pants

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Re: Newbie neeing a bit of help - oscillator? 555?
« Reply #2 on: August 26, 2010, 04:29:22 PM »

I was kind of looking for tips on how to get a 555 oscillator working to use as an on/off trigger to a part of the chip.
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jamiewoody

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Re: Newbie neeing a bit of help - oscillator? 555?
« Reply #3 on: September 20, 2010, 03:23:56 PM »

or, you could just connect a wire to this point, and a bolt and washer to the other side of the wire, and make a body contact. ;-)
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WubbGmbaa

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Re: Newbie neeing a bit of help - oscillator? 555?
« Reply #4 on: February 09, 2016, 05:44:47 PM »

Hey, I hate to be that guy who replies to 5+ year old topics, but...

Did you end up figuring out which pin it was that was causing this? I've been poking around in a PT87, and I haven't found anything interesting aside from pitch-shifting. Think I might try hooking up a body contact there.
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