[sdiy] Kraakdoos output revisited

[Metrophage]

I just got a lot of my junk back from the storage facility near my
parent's house, and sorting through it found the little output
transformers I wanted to use for my Kraakdoos output. I don't recall
what they are supposed to be specifically, but for some reason I
thought they'd be 8 ohm - 10k ohm (I know I've asked how to measure
transformer windings before, I'll look it up later).

With the voltage divider which was suggested before (by Ian and Henry),
the output was at a decent level, but my problem was that the output
connection interacted with the Kraakdoos circuit. Example? I could have
my fingers on the contacts to produce a certain oscillation, meanwhile
I'd plug in the output to my amp, and the oscillations would change
drastically. Sometimes they'd even stall. So, it was very much playable
without the output being used, and slightly less so connected to an
external device. The output changed the "action" of the circuit.
Consider though, that the Kraakdoos circuit is an old-style op-amp
which is induced to feedback and re-bias via finger contacts, it is
designed to be very sensitive to the point of crazy.

I just removed the voltage divider and cap which I'd done before, and
tried Godfried's method of simply connecting an 8 ohm - 10k ohm
transformer to the same points in the circuit as the speaker. It is no
better! Even with transformer output, plugging in an output cable to my
amps, soundcards, etc changes the sound. I don't understand how this is
working. I suppose I can live with it, but I am perplexed. I love the
way the unit plays and sounds ordinarily, so am not inclined to change
it very much. Weird though that none of the others who accounted their
Kraakdoos building recently have experienced this. I'll try building
another one later with banana-plug contacts (for electrodes, etc) and
switchable caps, maybe it will be a different story.

Not really looking for any answers here, just thinking out loud.
CJ


		
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