Dual Drone Light Theremin - DIY Synth

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/ observerb Schematic explanation and demo of a dual drone synth based on a 40106 chip. Oscillator 2 can be used as a light theremin to control the pitch with a light source. Also covers how to use a summing amp to combine signals. The module also contains a passive low pass filter to shape the sound.
Schematic and more at www.observerb.com
Support me on Patreon if you'd like, it'd make my day :) / observerb

Опубликовано:

10 сен 2024

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Комментарии : 8

@buckstarchaser2376 9 месяцев назад

That's really good! I'd like to see some of the addons, such as the sync, or maybe a second LDR to control duty cycle. Some demos with an envelope to hear what it would sound like as an instrument would be great.

@observerb 9 месяцев назад

So many possibilities with this chip! I've run it through my Poly D (mini moog clone) filter and sequencer and it sounds amazing.

@TheCultofshiva 3 месяца назад

I love these simple projects, the 40106 is very simple to use as squarewave oscillator with potentiometers for frequency and volume control. I try to solder the oscillator with sync project on a normal prototype pcb but keep running into problems, it's hard to connect the pins in a neat way but it's getting there. And I ordered a stack of veroboard pcb where all the holes are connected in rows similar to the breadboard setup. But it feels like cheating 😕 Does anyone have some tips maybe, I keep a 2 or 3 hole space between wires and pins and then connect them with a piece of bare wire. Connecting to the plus and minus doesn't work this way though... But Observer B is a great help. Moritz Klein is really good too BTW but they are much more involved projects and these simple circuits are easy to understand and mess around with before building a bigger stuff. IC's easily burn out from simple mistakes and even though they are cheap it sucks.

@observerb 3 месяца назад

Thanks for the kind words! When going to perfboard, I use chip sockets, it makes it easy to swap a chip if one burns out. I use a drill to to break the connections on the board, like in the middle of a chip, making sure there is no copper on those spots, but not drilling all the way through the board. I've had problems befire with "cold solder joints" where all of the connections look good, but aren't actually connected. Try re-flowing all of the joints, it has fixed synths for me that weren't working or had stopped working. Good luck!