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 Forum index » DIY Hardware and Software » Circuit Bending
Passing Signal Through Bent Keyboard
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timd3



Joined: Nov 09, 2013
Posts: 4
Location: wisconsin

PostPosted: Sat Nov 09, 2013 6:53 pm    Post subject: Passing Signal Through Bent Keyboard Reply with quote  Mark this post and the followings unread

Hi everyone - I'm new to this forum, but not to circuit bending, and I had a thought about passing signals through keyboards (mic, guitar, other signals, etc). Many older keyboards are the target of bends and many/all? have rows of interesting sounds you can select.

My idea - if possible - was to somehow find a point on the circuit board where you could derive an input and have that input be affected by the current preset sound. I have tried to hack keyboards for an input in the past, but all I could seem to get was the straight signal through the speakers, but no effects.

I understand that every keyboard is different and they use different IC's, layout, etc, but this post is more theory based. Can it be done?
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PHOBoS



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PostPosted: Sun Nov 10, 2013 8:50 am    Post subject: Re: Passing Signal Through Bent Keyboard Reply with quote  Mark this post and the followings unread

timd3 wrote:
Hi everyone - I'm new to this forum, but not to circuit bending, and I had a thought about passing signals through keyboards (mic, guitar, other signals, etc). Many older keyboards are the target of bends and many/all? have rows of interesting sounds you can select.

My idea - if possible - was to somehow find a point on the circuit board where you could derive an input and have that input be affected by the current preset sound. I have tried to hack keyboards for an input in the past, but all I could seem to get was the straight signal through the speakers, but no effects.

I understand that every keyboard is different and they use different IC's, layout, etc, but this post is more theory based. Can it be done?


welcome party!

can it be done ?,. well depending on the keyboard it might be possible. If you look at (modern) toy keyboards they usually just have one
chip with every button and key wired into a matrix and there usually aren't any real bend possibilities. Sometimes there is a small amplifier
on board but besides maybe some distortion from overdriving it, this will only result in:
Quote:
all I could seem to get was the straight signal through the speakers, but no effects.

However if the circuit is more complex you might be able to inject a signal somewhere, but most of them will have digital circuits so unless you
use an ADC you can only feed it digital signals, but I think that will most likely just result in crashes or weird behaviour (could be fun) instead of
affecting the input signal.

You would need something build like an analog synth to use it as an effect (I think the Casio SK-1 has a small analog section). Another thing that
could work is take the output from a keyboard and use it to somehow modulate another signal. (AM, FM, ringmod etc.)

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timd3



Joined: Nov 09, 2013
Posts: 4
Location: wisconsin

PostPosted: Sun Nov 10, 2013 7:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

I thought it may be difficult to do this. That makes perfect sense though that the digital chip the sound effects are on doesn't even "see" the analog signal from the guitar or mic.
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JingleJoe



Joined: Nov 10, 2011
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Location: Lancashire, England
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PostPosted: Tue Nov 12, 2013 9:32 am    Post subject: Reply with quote  Mark this post and the followings unread

something to take into account is that most keyboards don't mess with a pre-existing signal, they alter voltages or binary numbers which are then used to control a VCO or oscillator of some kind.
so you can't put in an audio signal and change the octave or something, however, you could combine both signals in some kind of heterodyning circuit and get effects like ringmod. A perfect example is one of my latest creations:
http://www.youtube.com/watch?v=APWKupy3xk8
It could be used to combine an oscillator signal and an external audio signal.

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timd3



Joined: Nov 09, 2013
Posts: 4
Location: wisconsin

PostPosted: Fri Nov 15, 2013 11:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Just had a chance to check that out - good work. That's really cool.
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Lorenzo



Joined: Nov 09, 2008
Posts: 349
Location: Trieste - Italyjstan

PostPosted: Fri Dec 06, 2013 2:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:

so you can't put in an audio signal and change the octave or something, however, you could combine both signals in some kind of heterodyning circuit and get effects like ringmod. A perfect example is one of my latest creations:
http://www.youtube.com/watch?v=APWKupy3xk8


ahah aha aha! It rocks!!

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JingleJoe



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PostPosted: Mon Dec 23, 2013 4:18 am    Post subject: Reply with quote  Mark this post and the followings unread

if you would like one you can always comission me to build you one Wink
see below link to my tumblr & email.

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