Introduction: Robot Voice Modulator

This is a simple to build device that converts your own human voice into a superior robot voice. It also includes a number of sweet features like an audio-in jack so that you can plug in all of your favorite instruments, microphones and music players, a vibrato mode and awesome pitch shifting buttons. It can be shifted two whole octaves in either direction. This provides for endless hours of fun (at the expense of everyone around you).

To here some crazy robot and pitch shifting action check out the file posted below.

Step 1: Go Get Stuff

You will need:

- And IKEA clock body
- An adjustable fluorescent desk lamp
- A HT8950 voice modulator
- A PCB
- An 18-pin socket
- 4 SPST buttons
- Condenser mic
- Parts for the circuit (see next step for details)
- Wire
- 2 1/8" audio jacks
- A power source
- Misc hardware

Step 2: The Circuit

Breadboard the "HT8950 with a Transistor Output Stage and a 6V Power Supply" circuit found in the official data sheet minus the transistor output stage. Instead, wire that to an audio out jack.

Then solder the circuit onto a PCB, temporarily omitting things like the microphone, audio jacks and switches. This will be added later.

You can test to make sure the board works by adding extra hookup wires for the audio jacks and microphone and connecting them through a breadboard.

Step 3: Get Bendy Arm

Take apart your fluorescent desk lamp and remove the nifty bend arm.

Don't remove the lamp wire from inside the arm. You will need this to hook up your microphone. Therefore, don't trim it too close.

Leave the mounting bracket still attached at the bottom of the arm.

Step 4: Bracket Stencil

Cut out a bracket stencil using the attached file.

If you happen to have an awesome Epilog laser cutter like we do at Instructables than you can use that to cut out the pattern onto a piece of tape. If you don't, an Exacto knife will do.

Place this pattern onto what you feel will be the back edge of the robot voice machine.

Drill out all of the holes with a power drill.

Step 5: Control Panel

Laser cut a control panel out of awesome transparent side-glow yellow acrylic using the file below.

If you don't have an awesome Epilog laser cutter than you can get the same effect with a jigsaw and a power drill with appropriate size bits.

Place the plastic clock face upside down inside the clock body and then rest the yellow piece snugly on top of it.

Step 6: Buttons

Insert your push buttons into the acrylic. Wire together ground to all of the buttons and the other wire to the respective pins on the PCB.

Step 7: Mount the Bracket

Mount the bendable arm to the clock body using nuts and bolts.

Step 8: Microphone

Mount a nice-looking fitting at the end of the bendable arm and then solder and glue the microphone inside of it.

Step 9: Drill Some More Holes

Insert the clock face upside down into the clock body. Drill four holes to match into the upside down clock body to match the mounting holes in the corners of your PCB.

Step 10: Plugs

Cut holes in the backside of the clock body such that you can mount your power jack, audio jacks and power switch.

Step 11: Mount the Circuit

Pass the extra hookup wires for the microphone, jacks and power through the mounting holes in the PCB and subsequently through the holes you just drilled in the clock face.

Continue passing them through the clock body until they are out the back of the case. Twist them together to tie the board in place.

Step 12: Glue

Put a little bit of hot glue between the side of the front panel and the clock body at various points around the edge of the case.

Step 13: Wire It Up

Wire up the switch to toggle between the audio in jack and the microphone.

Wire the power to the power wires and the audio out out jack to the audio out wires.

Step 14: Plug and Play

Turn it on and let your owl rock out on the dance (apartment) floor intergalactic robot-styly.

Comments

author
CraigS12 (author)2015-07-08

I'm wondering if I would be able to do this for a cosplay and place the mic and speaker in a lower half, face resperator. And have the cable going to the circuit that's down on the hip. Would that be possible?

author
Aalexz (author)CraigS122017-01-19

Of course! Just make sure you're using a good enough amp circuit so you can't hear your voice!

The speaker output function can be found on the official datasheet of the IC, mentioned in the article.

author
ZarrarH (author)2015-06-21

author
Mark ChristopherD (author)2015-02-05

SIR can we have a copy of your circuit diagram of this project

author
Bmrshoot (author)2014-11-10

Building a transformer costume for my son, will this make his voice sound like a transformer....iron hide specifically.

author
gluvit (author)2013-12-21

Good stuff

author
LoSkana (author)2013-09-01

Ehm... the data sheet is now not available ^^

author
erikm1811 (author)LoSkana2013-11-29

The chip and the Datasheet is available at Sparkfun.com

author
JSWheeler (author)2013-07-19

The "data sheet" link is giving me an error.

author
synthdust (author)2012-10-19

Looks like he has two different circuits on that bread board. That little 8 pin IC is missing from the strip board... I think.

author
synthdust (author)synthdust2012-10-19

*perf board.

author
skydlimit016 (author)2012-07-18

is this expensive?????????

author
Michael_Bell (author)2012-03-21

Darn I dont have one of those chips. Mabey Marvin will loan me his space modulator, and I can use that...

author
Akash.C.A (author)2011-12-14

Where is the circuit diagram......?

author
gbarbadillo villanueva (author)2011-10-08

Hi,
I´m trying to build the Voice Modulator and I´ll thank you if you tell me which microphone did you use.
Thanks a lot
Will

author
AlternateLives (author)2011-03-05

Could you work this into a synth oscillator?

author
josh1324 (author)AlternateLives2011-05-29

I don't see why not, just replace the micro phone with the synths output.
And don't forget to hook the black wire of the mic to ground.

Ps. Did you make your own synth?

author
monsterman (author)2011-02-02

do yo remove the 200 ohm pot

author
oweng4000 (author)2010-12-24

That mp3 was hilarious

author
Volgon (author)2010-08-06

Where did you get the chip from? i checked all the usual places (radioshack, amazon, Frys) and i cant find it anywhere.

author
randofo (author)Volgon2010-08-07

Ebay. I got 10 for about $20.

author
Malccc (author)2010-07-04

hey,thank you very much!Im gonna give it a try~!

author
youn_link (author)2010-07-01

Can you pass the diagram circuit?

author
srmousse (author)2010-06-11

You get points for functionality and style!!! =)

author
mdnahid94 (author)2010-06-11

Please give me circuit diagram. Becoz I can try this.....

author
tinsolder (author)2010-06-11

if you'r too lazy to breadboard etc... check out for a Velleman mini-kit (MK171). Its also funny to bend it. and you can also use it for a stomp box.

author
SinAmos (author)2010-06-11

A HT8950 voice modulator chip. :( I thought you were going to do it electronically/mechanically.

author
codyduncan (author)2010-05-03

 What's going on on that board?  I see an extra IC and what looks like a transistor.

I'm thinking your "they can figure it out" scheme may not be the best policy.  I am trying to build this right now, but I am trying to avoid building it and finding that it doesn't work without  this or that extra component.

If you did add extra parts (it looks as though you did) what were they for?

author
SGplayer (author)2009-10-15

NICE!
 

author
Foaly7 (author)2009-09-19

How big is this thing?

author
randofo (author)Foaly72009-09-20

About the size of a wall clock or stuffed owl. The circuit is pretty small. The casing can be miniaturized.

author
Foaly7 (author)randofo2009-09-20

Ok, and can you make the microphone attached to a cord that can be ran up, say, a jacket sleeve? I suppose you could, but how?

author
RPisces (author)2009-09-10

I have that same laptop lol

author
helios12 (author)2009-08-01

How much did all the parts cost?

author
Arnoldofingo (author)2009-07-29

~BINGO~ That's exactly -eh, what I was looking at... Now as I read through the threads (how could I miss it...?) it's all clear now. Thanks

author
Arnoldofingo (author)2009-07-29

you have a transistor; not listed in your 'to get' list... Wold be nice to know~

author
randofo (author)Arnoldofingo2009-07-29

No I don't. Maybe you are looking at the 7805 voltage regulator.

author
bgirlrox17 (author)2009-07-06

I love the idea

author
amplex (author)2009-06-30

i bought 3 off ebay for <$10 less than a year ago. ive had one sitting on a breadboard for 8 months and still havent put it on perfboard, even though this is a really cool bendable 8bit modulator =( maybe ill finally do it today

author
sourcery (author)2009-06-25

Maybe you could download DIY Layout Creator http://www.synthdiy.com/show/?id=2489 and draw a nice circuit diagram for this circuit. It would be easier to follow instructions that way ;)

author
randofo (author)sourcery2009-06-25

I normally include schematics, but didn't see much point in redrawing something that could be found on the data sheet. There are only a few minor changes which are easy to figure out (such as the SPDT toggle switch between the mic and audio in and the audio out jack instead of the amplifier stage).

author
sourcery (author)randofo2009-06-26

Ok, it was just a suggestion... I have started to use the program (DIY Layout Creator), and it is quite useful for experiment board projects :) Now I just need to find the HT8950 chip in Sweden :)

author
Roland54 (author)sourcery2009-06-28

If you look on the Internet, you can find the suppliers but there are also some alternatives mentioned like from Yamaha.

author
kicker109 (author)2009-06-25

AWESOME 'ible, can you get a different voice to come out... e.g. the voice that kidnappers use (im not a kidnapper)

author
randofo (author)kicker1092009-06-25

So long as you are not a kidnapper, then, yes. Yes, you can.

author
kicker109 (author)randofo2009-06-27

How could i do that?

author
randofo (author)kicker1092009-06-27

Shift the pitch down rather than up.

author
frodobot (author)2009-06-25

is that .cdr download a circuit diagram? If it isn't, could you post one please because it is quite hard to see where components go.

author
randofo (author)frodobot2009-06-25

Check the link to the data sheet that I post on that step.

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Bio: My name is Randy and I founded the Instructables Design Studio. I'm also the author of the books 'Simple Bots,' and '62 Projects to ... More »
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