A home brew mini-synth idea using no transistors with the Patrick Oscillator
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I have decided to begin blending the Patrick oscillator and other circuits to the keyboard. The circuits are mounted and just need the interconnects added.
October 28, 2020 - I am at a bit of a crossroads with this project. I will continue to explore just how much I can expand the range of sounds with this oscillator but now I also want to build a multi voice drone similar to what Sam from Look Mum No Computer fame has made at https://www.lookmumnocomputer.com/
If you have a moment then check out his projects. All are Mad Good but I really love the Drone of his and I think I can make at least a 5 to 10 voice example. Check out his Megadrone https://www.lookmumnocomputer.com/projects#/1000-oscillator-megadrone
And if I make a batch of oscillators then I could have a basic and messy polyphonic system in its beginning stages.
October 25, 2020 - Video of current tests of the LFO and perhaps make a Passive Optical Theremin
October 14, 2020 - First test scale using the very basic keyboard. I still need to add the sharp/flat keys but this taking shape.
October 14, 2020 - Starting the layout of the tuning pots and keyboard switches.
Here is the basic circuit I am using. Pardon my poor sketch ;-)
October 13, 2020 - I found some very small switches in my junk box that will do for a small push button keyboard. Not ideal but good enough for testing. These were from a printer/copier that my landlord gave to me so why not make use of some of those parts. This will be a single octave from C2 through to C3 plus a extra key on the left for a knob controlled tone. Right now the oscillator has a hard time reaching C4 so going with the lower octave. Besides I love the deep rich sound this circuit has down there :-)
October 13, 2020 - I have had this old TV tuner board in my junk box for about thirty years and I think these 20K pots will be of great use in the tuning of the keyboard part of this project. These pots take about 100 turns for full range. Very fine tuning indeed ;-)
October 11, 2020
This is just a sample of the deep low sound from the Patrick Oscillator. Very low frequencies and sounds great.
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Actually, I have already started on that. All I need for the single octave is one oscillator for each note. As long as I keep it simple XD
Cool! You should make a few and start an ensemble. As they say, many hands make light work. 🤣
Now that would be cool :-)
Light work.... Ooooooooo
Light Work, I love it :-)
Doctor, you did it again !
I guess so but in all fairness Patrick Flett invented the circuit, I just pounced on it as a possible passive synth sound machine :-)
Patrick Flett explains how it works in this video:
Yes, I am so glad that Patrick shared his circuit with me and now I am expanding on it to where it might actually be a very flexible synth.
I'm struggling to understand how the oscillation happens. I thought it required amplification and a positive feedback loop. Going to have to dig into this one a bit more - thanks for the head-scratcher. Like the way it sounds, BTW.
I am struggling with the concept myself. My led/CdS Logic is easy enough to follow but this circuit confounds me a bit ;-)
if not inverting, perhaps just a relaxation oscillator.
Hi, interesting project.
I assume you meant this Patrick Flett: https://www.youtube.com/channel/UCdY0rnioc1twUgD6JwpuXvg
Maybe saying a bit more than providing a schematic would help to better understand how you want to make a synthesizer. Or do you just aim at making some sine wave sounds?
Yup, same person, he found my Light Logic videos and we have exchanged some ideas and he sent me his schematic. This is my first real attempt at a synthesizer of any kind and this is the start of a very interesting build if I can maintain the transistorless aspect of it. The very simple keyboard is now working and tuned. I will post as I learn more and develop this project
I would like to add loops and feedback as well as filtering but that will still be a step by step adventure for me :-)
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I'd love to build a polyphonic one...