Analogic!

JingleJoe

The video! It explains all, watch it with your eyes and listen to it with your ears.
The basic architecture of this device is this:

Draal · Posted: Mon May 07, 2012 4:05 pm Post subject:

I like small units like this. They are cool on their own and can be part of a bigger orchestra of self contained units. Options, options Cool

.

JingleJoe · Posted: Tue May 08, 2012 6:32 am Post subject:

JingleJoe · Posted: Tue May 08, 2012 1:50 pm Post subject:

While looking for the schematics for a different device I found the schematics for the analogic multiplex and by lucky coincidence the schematics for the other device were scrawled on the back! Very Happy

This circuit is the basis of the above device, however the above contraption also has a VCF and the LFO is light controlled too. The tri-PWM LFO control switch on the Y inputs was a bit ineffective because the triangle of the LFO is so small and biased up about two fifths of the supply, however it does make some noticeable change in sound but only just. I'd rather just use the PWM LFO and pull down resistors in place of the triangle output if I did this again.
You could amplify the triangle wave and remove the offset with a differential op amp amplifier though Wink

Overall circuit output is from the X output of the 4051, buffering it is advised but not allways necessary. All component values can vary alot, change oscillator capacitors to change overall frequency range.

LCO stands for Light Controlled Oscillator by the way Smile

Analogic Multliplex circuit diagram.png

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JingleJoe · Posted: Mon May 14, 2012 12:19 pm Post subject:

This one is now for sale Very Happy

Get it while it's still hot off the soldering iron!
Ye Threade of Ye olde Sale
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aerogramma · Posted: Mon May 28, 2012 10:41 am Post subject:

another great device?

how did you go about on the led controlled lfo?

cheers!

JingleJoe · Posted: Mon May 28, 2012 1:45 pm Post subject:

aerogramma · Posted: Mon May 28, 2012 1:53 pm Post subject:

ah yes sorry about that!.. I went ahead of myself, I'm thinking of an LDR controlled LFO, a pulsating led controlling lfo speed Smile

JingleJoe · Posted: Mon May 28, 2012 1:57 pm Post subject: