Simple ways to circuit bend a toy

Simple ways to circuit bend a toy
I want to show some of the modifications you can do to any toy to turn it from what might simply be an annoyance to a tool for glitchy, noisy awesomeness. The techniques here are pretty easy--even if you don't have much experience with electronics. All you need is a willingness to make mistakes, to repeatedly pop batteries in and out when you crash the processor and need to reset things, and a desire to make strange sounds.

This instructable, and its videos, show two of the simplest modifications that can be done: pitch bending and body contacts. I've deliberately not shown some of the more complicated methods, like triggering samples using a timer circuit, that you can learn once you've got the basics down.

Most steps have videos that carefully go through the processes described in the text. I see them as vital tools to help you see how this is down within a real circuit.

Difficulty: beginner to immediate
Skills needed: basic electronics (know about resistors, power, ground, switches), soldering (although this is an easy-enough project to get or build soldering skills)
 
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Step 1Materials and tools

Materials and tools
You need a few things to begin with, of course. If you have never worked with electronics before you'll have to spend more money to get things like a soldering iron--but I bet you can get everything you need for under $30.

Onto the list of things you need!

Toy: Obviously you need a toy to modify--one that you don't mind opening up and (potentially) making inoperable if something bad happens. I recommend the usual places: thrift stores, surplus stores, etc. But...please, please, please, PLEASE don't go to a major retailer and purchase something new to modify. There are enough toys out there on the market being discarded---we don't need to give multinational corporations higher profits by buying something new when we can reuse and modify something that already exists. So go to your thrift store and scrounge around; you might not find something immediately, but be patient for the right toy to come along.

The best toys are the ones that aren't complicated: only a few sounds, a few buttons, etc. Anything that has complicated behavior is going to have complicated circuitry that is both going to be more difficult to modify and more likely to simply screw things up without making useful sounds. A good beginning toy to bend would be a stuffed animal that makes a few sounds...open up the toy and you'll find inside a plastic case that has an extremely basic chip. In my case, I chose a toy designed for toddlers that has only a few buttons and sounds--meaning the circuit inside will be relatively straightforward.

And it should go without saying (I hope)...but don't bend anything that requires a connection to the wall or mains! ONLY BEND TOYS THAT USE 9V BATTERIES OR LESS!!! I'm certainly not responsible if you hurt yourself doing this...you shouldn't, if you bend battery powered toys. But no warranties, etc. legal mumbo jumbo.

Electronics: For this bend you'll need a random assortment of parts: on/off switches, some resistors, a potentiometer, and wire. To attach things you'll of course need a soldering iron and solder. And to test things out, some alligator clips are really useful.

Other tools: A drill or dremel to cut holes in the casing, and a screwdriver to take the case apart.

The video for this step is me playing around with the toy before any modifications are made.


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36 comments
Aug 16, 2011. 8:46 AMadebruin says:
Thanks for all these beginner bend tips. I started to play with connections on a keyboard's circuit board (my first attempt at circuit bending). Found a few intersting sounds, made some notes but didn't solder any points. But I hit some contacts that killed the sound. And taking out the batteries doesn't reset the circuit board, but the keyboard is definitely powering off and on still. Just no sound. Any suggestions?! Thanks!
Feb 20, 2010. 1:10 PMZem says:
 I like that bend. Are you just attaching one lead the the chip? Or is one lead at the chip, and another on ground?
May 5, 2009. 3:02 PMZem says:
Cool, can you add a jack to it? So you could hook it up to an amp.
Nov 5, 2009. 6:27 PMravingking2008 says:
adding jack to it is easy but WHY WHY ???  nobody wants to listen to kids toys @ 100 watts  lmao
Nov 5, 2009. 7:54 PMZem says:
Well, yeah. but if you did a really cool bend... 
Nov 6, 2009. 5:52 AMravingking2008 says:
like a circuit bent swearing furby doorbell. my kids would love that
Nov 6, 2009. 8:13 AMZem says:
XD 
Aug 26, 2009. 6:30 PMnos770 says:
What pot did you use? and what was the resistance?
Aug 7, 2009. 1:04 PMMilotisX says:
how do you wire the pot though?
Aug 3, 2008. 8:34 PMcloner says:
anybody know or thought about the negative psychological effects this would cause to a child?
Dec 1, 2008. 5:04 PMSteeltowndude says:
Anybody care? Lol It shouldn't hae any effects unless it was negative sounds. Like screaming and gunshots.
Oct 9, 2008. 12:31 PMkelseymh says:
Nice mod! I've been searching for the "inverse" I'ble, but have been unsuccessful, so I'm asking around...given a toy with a built-in speaker, what is the best way to add a volume control knob (potentiometer)? I can make a mute trivially by inserting a switch on either speaker wire. But for a volume control is an inline pot, or a "shunt" pot (across the speaker terminals), the better choice?
Aug 3, 2008. 6:46 PMMACKattacksnipe says:
make a synth box
Jul 9, 2008. 10:44 AMcotton says:
dosent work i did it on old toy and it only turned the volume down!
May 17, 2008. 9:10 AMgarbagebomb says:
i'm selling a "circuit bending starter kit" i put togethera bunch of NEW tools that can be used for circuit bending and a tool box w/ built-in speakers and iPod jack. *unopened dual heat soldering iorn w/pointed tip *unopened soldering iorn stand and cleaner *unopened 60/40 solder *unopened Rosin flux *unopened 18 range multitester *Plyers needle nose, side snips *Wire cutter *9 sets of alligator clips (test leads) *a fistfull of microswitches, potentiometers, toggle and push button switches *solid core copper wire :::TOOL BOX::: w/tray, built in speakers, built in am/fm reciever...but who cares? it's got an IPOD input! awesome, it's like a boombox you can bring your tools and projects in to the next circut bending workshop and keep yourself entertained for hours on a couple AAA batteries! (IPOD not included) ...i'll even give you my old projects, INCLUDING A BEHEADED TEDDY RUXPIN, & a website and email for help & hook you up with the weirdos i know that do this regularly in Chicago! pick up in Chicago, cause i don't know how to do this otherwise.
Mar 1, 2008. 3:35 AMgraymalking says:
The toy keeps the same concept, just that now is for grown ups too :D Good work.
Feb 26, 2008. 3:39 PMincorrigible packrat says:
Many years ago, I used to take apart the calculators that my schoolmates trashed. Once, just for fun, I powered up a board from one, and started randomly tapping processor contacts with the leads from a crystal earphone (from my trusty Radio Shack 30 in one Electronics Projects Lab) You would not believe the funky sounds that'll come out of those things!
Feb 28, 2008. 5:59 PMincorrigible packrat says:
That's exactly what I mean. It's a pretty special sound. I've also tried computer mobos (that's with them running too, mind). If I was less lazy, I'd hook it to an amp. If I was even less lazy, I'd record some clips & post 'em.
Feb 27, 2008. 1:02 AMGonazar says:
Lol, you looked like you were having too much fun with the toy before the mod, i mean a good 1:30+? jkjk good job man, looks like the techy way of solving the stress issues from such toys played excessively.
Feb 22, 2008. 8:02 PMdaem says:
hehe... Yeah, this is definitely a fun thing to do. The festivals they hold out in Portland and New York City are off the hook, so I hear....
Feb 26, 2008. 12:50 PMphilthyanimal says:
what festivals in portland?
Feb 23, 2008. 7:56 PMsheepishlion says:
Cool! Now I am inspired to break a few toys. +1
Feb 23, 2008. 4:46 PMcr0ybot says:
I'm in the process of circuit-bending a 1st gen Furby. This is a great tutorial on the basics!
Feb 22, 2008. 4:31 PMchalky says:
dude this rocks nice one! my little bro's got a whole heap of this stuff lying around so i think in the morning im gunna get a bending lol:)
Feb 21, 2008. 4:59 PMLinuxH4x0r says:
Click reply at the bottom of their comment or they won't know they got a reply
Feb 21, 2008. 5:56 PMLinuxH4x0r says:
Glad I could help! Feel free to ask me (PM) if you ever need anything.
Feb 21, 2008. 3:52 PMGorillazMiko says:
"Circuit bending".
I hear it all the time, and it always confuses me, I can never understand what it means.

Does it mean it makes really weird noises and stuff?

Nice Instructable by the way.
Feb 21, 2008. 4:58 PMLinuxH4x0r says:
Cool! Can't wait go start bending.

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Author:nknouf
student, researcher, (wanna-be) theorist, (wanna-be) artist