Introduction: 555 Square-Wave Theremin

Picture of 555 Square-Wave Theremin

For this project, you will need:
10k ohm resistor
10 megohm resistor
A 3.9k or 4.7k ohm resistor 
555 Timer ic & socket
2N3904 NPN transistor 
.01u ceramic capacitor
USB cable
Piezoelectric speaker
photo-transistor (or other type of input, pot's and skin work fine)
wires and connectors 

Step 1: Schematic

Picture of Schematic

Since i didn't take pictures while i was making it, here's the schematic (better than pictures in my opinion). 

Step 2: Finished Product

Picture of Finished Product

Step 3: For Added Effect

use an arduino board and solid-state relays for a synthesizer effect. or use push buttons and resistors for a more simple synthesizer like i did. or even better, find a way to combine both!  i had a picture to add, but the uploader was on the fritz. :(


mrmerino (author)2012-10-22

I thought 555s were supposed to handle 5v to 12v? I've put 12v through 555s more times than I can count.

ThereminWorld (author)2012-03-29

Nice! Thanks for posting. We blogged this on ThereminWorld today.

Awesome-aniac (author)2012-03-28

That last step would be a great place for a video if you could make one.

toast5678 (author)Awesome-aniac2012-03-29

yes, i agree i will try to add one if the uploader will work.

About This Instructable




Bio: I'm a 18 year-old guy who loves tinkering with and building electronics. I am self taught (in terms of electricity), my grandpa was an ... More »
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