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 Forum index » DIY Hardware and Software » Circuit Bending
Suggestions for bending the Yamaha DD-20 drum machine?
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bbinkovitz



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PostPosted: Thu Nov 05, 2009 9:05 pm    Post subject: Suggestions for bending the Yamaha DD-20 drum machine?
Subject description: All I know how to do is installing switches on straight wiring.
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I have found a few good bends just with straight wiring between pins on the chip. Are there other ones I should know of?

Does this instrument have an easily accessible bitrate-controlling resistor that I can circumvent with a knob to adjust pitch? I learned to do this to a cheap toy sampler at the e-m event this year but I don't know if more sophisticated circuits have the same feature?

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electri-fire



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PostPosted: Sat Nov 07, 2009 6:50 am    Post subject: Re: Suggestions for bending the Yamaha DD-20 drum machine?
Subject description: All I know how to do is installing switches on straight wiring.
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bbinkovitz wrote:
Does this instrument have an easily accessible bitrate-controlling resistor that I can circumvent with a knob to adjust pitch? I learned to do this to a cheap toy sampler at the e-m event this year but I don't know if more sophisticated circuits have the same feature?


Hey Beth, into circuitbending now. Nice. I don't know the DD20. I have had several Yamaha devices that work with crystal clocks, those are less reactive to pitchbend points.

As we've learned at the "Casperelectronics" Pete Edwards workshop the clockspeed (or pitch) resistor is usually near the CPU, that would be the largest most complicated IC at the board.

When there is a pitch resistor it often reacts to touching it with a damp finger, or touch it while simultaniously touching other parts of the circuit. So you'd be able to find your resistor yourself by touching the board all over. Do this while powering the device ON BATTERIES! Also I recommend touching singlehandedly, so you don't send signals across the body.
The risk of electrocution using an AC/DC adapter is largly exagerated I think, but I broke several adapters by shorting them.

Sending frequencies through the human body affects your fysiology. I have personally experienced turning slightly psychotic by prolonged touchcontacting a toy keyboard and spent hours scratching at the soundnames printed on it to highlight the secret messages that leaped upon me Smile . Running on batteries at least limits the power your device is able to emit.

.
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bbinkovitz



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PostPosted: Sat Nov 07, 2009 8:10 am    Post subject: Re: Suggestions for bending the Yamaha DD-20 drum machine?
Subject description: All I know how to do is installing switches on straight wiring.
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electri-fire wrote:

Hey Beth, into circuitbending now. Nice. I don't know the DD20. I have had several Yamaha devices that work with crystal clocks, those are less reactive to pitchbend points.

Hi! Actually I started bending this little guy before I came to e-m this year. I thought about bringing it and ended up really wishing I had. I've slowly destroyed a few other Yamaha and Casio products as well... now I'm looking to create some more sustainable bent instruments.

My DD-20 looks exactly like this:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

I don't know what "crystal clock"means (I Googled it and only found expensive Waterford mantlepiece clocks that you're supposed to give as a wedding present Rolling Eyes ) but it seems possible that what you describe might be the case here as well.

Quote:

As we've learned at the "Casperelectronics" Pete Edwards workshop the clockspeed (or pitch) resistor is usually near the CPU, that would be the largest most complicated IC at the board.


Yeah, I've already found the big IC and soldered a few connections to it. Actually in the DD-20 the largest IC and a second, slightly smaller one seem to be wired together such that the pins are pretty much the same. I've looked around both of these but not found anything that looks like a definitive candidate for clockspeed resistor.

Quote:

When there is a pitch resistor it often reacts to touching it with a damp finger, or touch it while simultaniously touching other parts of the circuit. So you'd be able to find your resistor yourself by touching the board all over. Do this while powering the device ON BATTERIES! Also I recommend touching singlehandedly, so you don't send signals across the body.
The risk of electrocution using an AC/DC adapter is largly exagerated I think, but I broke several adapters by shorting them.

I tried this already. With it plugged in, actually. Just stayed away from capacitors and also the left side of the board (where the power comes in) and didn't touch the speaker contacts either. Shorted all the resistors around both IC chips, while running the annoying demo, got nothing.

Quote:

Sending frequencies through the human body affects your fysiology. I have personally experienced turning slightly psychotic by prolonged touchcontacting a toy keyboard and spent hours scratching at the soundnames printed on it to highlight the secret messages that leaped upon me Smile . Running on batteries at least limits the power your device is able to emit.

.


Woah, that has never happened to me. Sounds like it would save money on drugs. Laughing

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electri-fire



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PostPosted: Sat Nov 07, 2009 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Yamaha IC's sometimes have datasheets around somewhere. did you look for them, and if so could you get me a link?
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electri-fire



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PostPosted: Sat Nov 07, 2009 8:31 am    Post subject: Re: Suggestions for bending the Yamaha DD-20 drum machine?
Subject description: All I know how to do is installing switches on straight wiring.
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bbinkovitz wrote:
I don't know what "crystal clock" means


The "crystal clock" has a crystal as a resonator to determine the clock frequency. Crystals have a fixed resonant frequency that can't be easily manipulated. I have the impression a lot of Yamaha's use them, the DD20 also I presume.

A datasheet is helpful to determine the "clock in" pin. Then you could isolate that pin from its components and feed it an clock of your own.

I did that once, it's a bit of a hassleI think.
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bbinkovitz



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PostPosted: Sat Nov 07, 2009 8:32 am    Post subject: Reply with quote  Mark this post and the followings unread

electri-fire wrote:
Yamaha IC's sometimes have datasheets around somewhere. did you look for them, and if so could you get me a link?


It didn't occur to me to Google for the IC data sheet separate from any general circuitry diagram things, I'll look right now.

(Just accidentally typed "yamaha dd-20 IC dada sheet" into Google, that would be quite interesting also if it existed!)

(Found the manual, not very useful but it did let me know that "The DD-20 is the result of passion,
vision, and commitment from people who want you to enjoy
yourself every time you play it." Very Happy )

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bbinkovitz



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PostPosted: Sat Nov 07, 2009 8:38 am    Post subject: Re: Suggestions for bending the Yamaha DD-20 drum machine?
Subject description: All I know how to do is installing switches on straight wiring.
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electri-fire wrote:
bbinkovitz wrote:
I don't know what "crystal clock" means


The "crystal clock" has a crystal as a resonator to determine the clock frequency. Crystals have a fixed resonant frequency that can't be easily manipulated. I have the impression a lot of Yamaha's use them, the DD20 also I presume.

A datasheet is helpful to determine the "clock in" pin. Then you could isolate that pin from its components and feed it an clock of your own.

I did that once, it's a bit of a hassleI think.


Oh, well do you think it is worth the hassle? Does it make good sounds?

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bbinkovitz



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PostPosted: Sat Nov 07, 2009 9:07 am    Post subject: Reply with quote  Mark this post and the followings unread

still looking for data sheet.

took some pictures, they are here:
http://img.b33p.net/pub/c/sxVkZ3sGbRfGmNVyPUwEEdzsk-Y3RAef

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bbinkovitz



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PostPosted: Sat Nov 07, 2009 9:09 am    Post subject: Reply with quote  Mark this post and the followings unread

I've Googled every number/letter combo that looks relevant... never seen so many "No results found" notices. Crying or Very sad

update: Google has indexed this topic already it seems... I'm getting my previous post as the top (and only relevant) hit when I search.

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PostPosted: Sat Nov 07, 2009 10:25 am    Post subject: Reply with quote  Mark this post and the followings unread

oh man, i broke it Sad

it still turns on and makes noise, but i have some kind of perma-bend going on that i can't switch on and off. i removed all the wires i had connected (good thing i took those photos!) and it is still there Sad

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Danno Gee Ray



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PostPosted: Sat Nov 07, 2009 1:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

For what it's worth, it looks like, from the pictures, that the IC on the surface mount side (IC-1) is likely the CPU. The other IC (to which you had wires atached) is probably the ROM where the various drum voices and other data are contained.

It could be interesting to socket the ROM chip and play with the data with an EPROM and programmer..?

Also, the componenets near the CPU may contain a clock circuit for the CPU. I did not notice any crystals. There could be a ceramic resonator in there that might look like a capacitor at first glance, but playing with some of the resistors near the CPU could yield some tasy results.
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bbinkovitz



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PostPosted: Sat Nov 07, 2009 1:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Danno Gee Ray wrote:
For what it's worth, it looks like, from the pictures, that the IC on the surface mount side (IC-1) is likely the CPU. The other IC (to which you had wires atached) is probably the ROM where the various drum voices and other data are contained.

It could be interesting to socket the ROM chip and play with the data with an EPROM and programmer..?

Also, the componenets near the CPU may contain a clock circuit for the CPU. I did not notice any crystals. There could be a ceramic resonator in there that might look like a capacitor at first glance, but playing with some of the resistors near the CPU could yield some tasy results.


Thanks! I will experiment!

Even if this one doesn't recover from whatever I did to it while I was closing up the case (oh the irony!!!), I will keep all the bends I discover in mind for the next one I find and make diagrams and stuff to share.

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PostPosted: Sat Nov 07, 2009 2:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cool.
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PostPosted: Sun Nov 08, 2009 9:08 am    Post subject: Reply with quote  Mark this post and the followings unread

in case anyone still cares, i fixed it.

also i realized i was using lead-free solder Embarassed so that would explain why my solder kept defying the laws of physics and giving me problems and melting my board and all that jazz.

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PostPosted: Sun Nov 08, 2009 11:12 am    Post subject: Reply with quote  Mark this post and the followings unread

i have a dd-20 also haven't had a chance to open it up yet. it fairly down on the list of projects of mine but some day ill get to it well hopefully.so i hope you get some good stuff from yours id like to see what it is capable of Very Happy
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PostPosted: Sun Nov 08, 2009 12:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

try the bends that i show in the photos, when you turn the switch back to off, it goes back to clean sound. so you can still use it for the vanilla purposes for which it was intended as well.

er, it's hard to see, i realized.

pins 3 and 8 (from the top) on the left side (white and yellow wires) connecting to 2 and 3 on the right side (orange wires)

so, the yellow wire has a switch for each orange wire. and the white wire has a switch for each orange wire as well. total of four switches, makes interesting permutations. some of the combinations are more than the sum of the individual bends, depending on what kit you have it set on.

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PostPosted: Sun Nov 08, 2009 1:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

bbinkovitz wrote:
in case anyone still cares, i fixed it.


Dear Beth, how could I not care about my fellow benders projects.

Hey, Stolenfat has done one. He is likely to read this post some time.

http://www.circuitbenders.co.uk/forum/forums.html?topic=567.0
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PostPosted: Sun Nov 08, 2009 1:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

electri-fire wrote:
bbinkovitz wrote:
in case anyone still cares, i fixed it.


Dear Beth, how could I not care about my fellow benders projects.

Hey, Stolenfat has done one. He is likely to read this post some time.

http://www.circuitbenders.co.uk/forum/forums.html?topic=567.0


that is cool like wo.

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electri-fire



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PostPosted: Sun Nov 08, 2009 3:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Danno Gee Ray wrote:
For what it's worth, it looks like, from the pictures, that the IC on the surface mount side (IC-1) is likely the CPU. The other IC (to which you had wires atached) is probably the ROM where the various drum voices and other data are contained.


Yep, that's what I think. A ROM could normally have more bends. They may not be immediately apparent, but only work when other sounds are selected.

Danno Gee Ray wrote:
I did not notice any crystals. There could be a ceramic resonator in there that might look like a capacitor at first glance, but playing with some of the resistors near the CPU could yield some tasy results.


Most likely candidate would be the 22K resistor.

Stolenfat had a slight pitchbend. I've had that with crystals, go too far and it crashes. I compared both sides of the board to see what's where. There's a crystal allright. The white capacitor looking block thingy has three legs.

Danno Gee Ray wrote:
It could be interesting to socket the ROM chip and play with the data with an EPROM and programmer..?


Nice if you've got the tools. Check burnkit2600 for howto.

That said it's even more work than attach your own clock signal. I marked the clock in/outputs with yellow arrows. One of these should be the clock input.


dd20-both-sides.jpg
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Crystals or capacitors?? Two legs good, three legs bad. (free after animal farm)
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Danno Gee Ray



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PostPosted: Sun Nov 08, 2009 6:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

3 Legs could be a ceramic resonator (pseudo crystal) and may have a resistor near it which may be slightly bendable...good call.
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PostPosted: Fri Nov 26, 2010 7:12 pm    Post subject: My attempts at bending this thing Reply with quote  Mark this post and the followings unread

Hey all, newbie here. I just did a DD-20 as my first bent instrument, and I think it came out pretty well for being a lame-o crystal clock device. Here're the ROM bends I put in:

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16
[ (C) 1994 YAMAHA ]
[ XP170B0 ]
[ 9942 D ]
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Stable bends
------------
3-4 - Weird dub echo / loop thing, depending on pattern
18-19 - Lo-Fi mode
18/19-32 - Noisy glitch

Glitches
--------
18-8 - Self-destruct sequence / earthquake

I basically wired the ground of 4 toggle switches together and connected the other ends to 18, 19, 32 and one of the 4.7kOhm resistors. I also put a couple of push-make buttons in to do the weird echo thing and the "self-destruct sequence" With it in Lo-Fi mode you get some cool, weird sounds out of the sound effects pads.

I'll post some pictures later. Cheers!


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PostPosted: Fri Dec 03, 2010 1:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

a long time ago, a friend and myself bent the crap out of a dd20. it is easily one of the best bendable toys ever. We some how turned it into an awesome white noise pattern machine with a patch bay that used a game pad for extra control.
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