Trouble with the Super Simple Oscillator

DIY STUFF
61

Super awesome! Saw it on the page. Are they different capacitors types for each one? Is one knob for the filter for each one? What is the down knob for?

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62

Another stunner. Can you talk me through the build and controls please?

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63

Congrats on the success. :blush:

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64

i don’t remember the value of each cap put all different,
the big pot 'down", is a general starve pot for all oscillator pitch
i add a passive mixer
all the detail for construction here : https://soundbender36.wordpress.com/2017/12/19/pink-drone-oscillator/

and after a make a little keyboard with 4 position to drive the general pitch

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65

Thanks for all the info. I love building this kind of thing. Especially in odd cases.
Love the 4 way switch keyboard. I’d never thought about doing that but the possibilities are endless. It’s almost like an Aeolian harp. Love it!

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66

Added some more oscillators and connected to an amp and power supply, thanks to a ton of help in this forum, still waiting on some more pots or I might try to just make one volume control like @Dud has

image
image1571×1030 474 KB

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67

cool !!!
for the detail I did an individual volume control (with a passive mixer) and a general pitch down control (power starve)
passive mixer :

mixer passif
mixer passif2129×1517 658 KB

and the pitch down pot general :
pot pitch down power vco
pot pitch down power vco1305×985 119 KB

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68

Lookin good! got some recordings of the sounds yet? :slight_smile:

69

Here is a video of my trying out each oscillator. The video might be a bit quiet.

Still have two issues.

  • Oscillator 4 doesn’t make any sound, event if I swap out the capacitor, resistor or transistor.
  • The volume to the TL072 amp seems to be on or off. With a very slight gain in volume before going off, I’m going to double check I’ve wired it up correctly next.
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70

it seems very high sound, maybe you can test with bigest cap for more bass

71

I went through all my caps and these were the only audible sounds, but that wasn’t using the amp, I’ll try again with some lower ones

72

this is for add in a modular system or just in a box like mine ?

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73

I was thinking of putting this in a DIY modular, ive been powering it from the Frequency Central Microbus

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74

ok, so not with 18v and a 2N3904 but with a SS9018 on 12v

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75

Or 2N3904 on ±12V.

Post must be at least 20 characters

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76

Yup this is the one, I added the amp because it was very quiet.

How does this work, can you bring in -12v somewhere?

77

Frequency Central Microbus, or any other Eurorack/Kosmo power supply, supplies +12V and -12V.

78

Ah I see, I was a bit confused when you first posted it, now I understand a little better. I’m using the Frequency Central Microbus so it shouldn’t be too hard.

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79

FOR MORE HELP WIYH THIS BUILD A SIMPLE TUTORIEL STEP BY STEP HERE

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80

Hello folks,

First post here. I just built the super simple oscillator and am measuring around 9 volts of DC offset on the output. Is that normal for this circuit and should I be looking at ways of reducing this before plugging it into a mixing desk?

If I should be looking at adding an output cap, what sort of values should I be looking at trying?

Many thanks in advance!

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