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Build a Square Wave Oscillator - Part 1 of DIY Modular Synths

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Step 7: Make Weird Noises

This oscillator works with any standard 9Volt wall adapter, commonly used for guitar pedals, shown in the pictures below. Simply plug it in to the 9V jack, take a standard 1/4" cable, plug it in to some speakers, and you're ready to make weird noises!

You've now opened a can of worms as far as electronic projects go, as there are countless other synthesizer modules that can be built: filters, envelopes, more complex oscillator structures; the list goes on and on.

For some idea of what kind of sounds you can get out of this box, here's a video showing the unit in action:

 
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@dnhushak, this cool and something i'm interested in building, have you built any more you could post (filters, other osc's, etc)? i'm putting together my own modular synth
dnhushak (author)  cbien-stephen2 years ago
That was the intent, to begin building more things, but I'm a EE student, so you know, time time time time time suck like nobody's business. If I do get around to more, I will definitely post it here.
could you replaced the frequency pot with a resistance based keyboard to get a simple square wave keyboard? or is the frequency range too limited to get a decent two octave keyboard?
dnhushak (author)  elijah_rippington2 years ago
It definitely wouldn't work like you think it'd work; when no key is pressed the circuit would see infinite resistance (open circuit) in that area of the oscillator, and would oscillate at an asymptotically low (or high, been a while since I've looked at the schematic) frequency, until a key is pressed, when it would go to a different pitch. There'd be no gating/enveloping to "note on" or "note off," to use midi terms, so there would always be a constant tone.
superrust2 years ago
This looks pretty cool I'm thinking about giving it a shot.
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