Skip navigation

ok back again…

casio pt-1

this is the 2nd CASIO keyboard I circuit bent…as usual the controls are placed on a extension unit through a serial cable because of the small space left inside the keyboard case…the box was a speaker from Virreina church in Gracia…(found beside it)

again no diagrams yet until I am back on my workshop in Barcelona… anyway if i’m not wrong, there was not many interesting glitch points on the board but the ones coming from the big chip in the left side… as soon as i get my hands on my notes i will update this post with a couple diagrams…

what does what

like in the other keyboard (PT-87) i tried to find alterations for the on board rhythms section, kind of low-pass filter and high pass filter, some distortions, and two interesting bass-lines heartbeat like that can be controlled with pots… On the other side, the pitch resistor was substituted by a long fader with a higher value than the original on board little pot which takes the rhythm tempo and pitch to an extremely slow speed, turning hit hats and drums in to beautiful noisy crash sounds, three body contact points were also added to achieve a more natural hands on way of playing, some of this points were duplicated to give more resolution to the effect…

body contacts

and finally a reset button (disconecting batteries) for when things go really wrong, (if it can be considered wrong when the little beast takes control of it’s own grunts…

and here a video:

another hack by 9volts

update: i found some pics of the circuit board with some bend points soldered ; don’t remember right now what does what as i said i will update later here is the pic:

some interesting points on PT-1 circuit board



  1. Nice Job on the circuit bent Casio! Have you guys checked out Kasio Kristmas?
    I believe that is there web site too.
    They do that rock song from the 80’s “Round and Round” with all CASIOS. WILD

    FREE Casio Loops too.

  2. Its such as you read my thoughts! You seem to grasp a lot approximately this,
    such as you wrote the e book in it or something.

    I feel that you just could do with some percent to force the message
    home a bit, however other than that, that is great blog.
    An excellent read. I will definitely be back.

  3. qué pasote, aún no tienes los diagramas? 😀

One Trackback/Pingback

  1. By Fixing a Casio PT-1 keyboard « Grill-bit on 08 Mar 2011 at 12:19 am

    […] was done in just a few couple of chips. As a result of this, it has been the subject of much circuit bending throughout the years. A wonderful hobby and definitely something Umeå Hackerspace encourages! Step […]

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: