Audio in to a 4093-based oscillator?

loss1234 · Posted: Tue Oct 05, 2010 11:22 am Post subject:

great job.

just so other people can understand what you are doing, can you clarify what your samples are a recording of? am i correct in assuming you used the 4069's to first SQUARE Up the guitar signal, and then you took that HIGH GAIN signal and put it into one input of the 4093 oscillator?

the sound you are getting sounds like you are SYNCING the oscillator to the guitar.

nice work

Top Top · Joined: Feb 02, 2010 Posts: 266 Location: California

corex · Joined: Mar 02, 2010 Posts: 114 Location: Las Vegas

electri-fire · Posted: Mon Oct 11, 2010 7:11 am Post subject:

slacker · Posted: Mon Oct 11, 2010 10:23 am Post subject:

Don't know if this is of any use, but I've done a couple of CMOS based guitar pedals and found a pretty good front end, that boosts, filters and then squares the guitar signal.

http://www.diystompboxes.com/smfforum/forums.html?topic=55644.0

The first 3 opamp stages in the schematic in that link are what you want. The component values are not that critical any similar values will work fine.

stolenfat · Posted: Tue Oct 12, 2010 2:44 am Post subject:

slacker · Posted: Tue Oct 12, 2010 9:46 am Post subject:

Works for me now, I think the forum does sometimes have connection problems though.

Here's a direct link to the schematic http://www.eskimo.plus.com/fxstuff/slacktave.png

corex · Joined: Mar 02, 2010 Posts: 114 Location: Las Vegas

Here's a schematic of the circuit I built with the 4069. The switch on the second gain stage is useful to get the guitar into the right range, though with the 100K resistor (R2), it's easy to get the noise floor up into the range where it is audible. It's quieter and better behaved with the 10K but for low signals such as guitar, you have to turn it all the way up.

So the output of this circuit just connects to the input leg of a 4093 oscillator in the examples that I posted.

Input circuit.png

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kdowqo · Joined: Mar 10, 2011 Posts: 7 Location: far far away

i used a simple npn to amplify the guitar signal and it deffintly works, i got everything from crazy octave up and down sounds to weird tremolo to extreme fuzz

a voltage sag on the VDD of the 4093 had great results to

ext gatead oscillator.jpg

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