![]() It’s a great chip for our purposes because it’ll work on a wide voltage range so that we don’t have to stress about powering it. The chip we’ll be using for our oscillator is the CD40106BE also called the HEF40106, depending on who makes it ( datasheet, PDF) which is a hex inverter with hysteresis. This high-low-high-low feedback circuit gives us a basic oscillator, only there’s a couple more nuances we’ll need to look into. But since they’re connected, the input is now pulled high which in turn sets the output to low, and we’re back where we started. If the input starts off low, the output goes high. SCHEMATICS FOR A OSCULATOR SYNTH HOW TOTo see how to make a quick and dirty oscillator out of an inverter, think about what would happen if you connected an inverter’s output back into its input. An inverter is a chip that outputs the opposite logical voltage level from what’s put in: if the input sees the high voltage level, it sets the output low (and vice-versa). ![]() Our simple oscillator circuit is based around a logic inverter. We’re starting at the beginning, but the curve is steep. And along the way, we’ll be laying the groundwork for much more complicated circuits later on. Making this circuit playable takes a little more experimentation, but that’s the whole point. We’ll start off with one oscillator (yawn!) and then turn it into something much more interesting really quickly. ![]() Have a look and then we’ll get down to it. To give you a taste of what we’re up to this session, here is a quick demo. There’s a thin line between the glitch as bug and the glitch as interesting discovery, and we’ll be dancing all over it. ![]() If you’re the type who insists that a screwdriver can’t be used to pry open a paint can, then maybe you’d better move along. If you just like to see CMOS chips wriggle and squirm in unintended ways, feel free to look over my shoulder. If you’re the circuit bender or electro-noise-punk type, this is gonna be right up your alley. If you’re the chiptunes type, you’ll probably find something you like here. In short, don’t expect pre-packaged smooth tones, because we’ll be making creative noise machines. Instead of synths being commodity gear made by large corporate enterprises, we’ll be building with the cheapest available parts, using and misusing digital logic. SCHEMATICS FOR A OSCULATOR SYNTH SERIESWelcome to part one of a series taking you down the rabbit hole of DIY electronic synthesizers based on (largely) CMOS logic chips. ![]()
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