[sdiy] another amusement from goldmine

[Rude 66]

i built this a few months ago from a web site schematic. same idea, same
problem. it functions very erratic, sometimes a pot does nothing and
sometimes bang! one pot ill make it do something completely different. i
even came to the same conclusion.. cool toy, but for serious use.. hmm, no.

r./



----- Original Message -----
From: "R. Drake" <rdrake at data2action.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, November 26, 2003 12:49 AM
Subject: [sdiy] another amusement from goldmine


> When I ordered my LM13600s, I risked an extra $15.75 on their "10 Note
Sound
> Kit".  The description reads: "Make robot sounds, computer effects, etc.
> Synthesizer features 10 adjustable notes, variable pitch and speed..."
> Sounded like it had some noize potential, and the price was worth a
gamble.
>
> Turns out to be a straightforward litte gizmo: a 555 clock running into a
> 4017 counter; each of the 10 steps from the counter goes thru a trim pot;
> and the resulting voltages are then fed as a cv to another 555 oscillator.
> Even has a "glide" switch to slur between notes.  At first I thought I
could
> maybe tweak this into a poor mans sequencer, so I built it up into a
project
> box, swapping out the trimmer pots for panel mounts from the junk box.
Also
> added a range switch to the clock to take it up into audio frequencies.
>
> Anyway, it's a little too flaky to be any use as a sequencer... among
other
> things, the 10 pots are all tied together on one end, so they interact.
But
> its a fun little noizemaker on its own, especially when the clocked at
> extreme low or high rates.  I also added a tap of the control voltage, and
> fed that to my blacet vco... now we're cookin!
>
> I'd recommend it as a evening's project, especially for my fellow beginner
> diyers...
>
>
> cheers,
>
> lbd
>
> >
> > My batch of LM13600s arrived today.
> >
> > Crow
> > /**/
>
>