[sdiy] cleaning up

[Czech Martin]

I'm actually cleaning up all these folders.
I have thrown away already a 1m^3 of paper, and there
is more to go.

But some interesting papers I will keep.

I've found two DIY papers about oscilloscopes.
Build your own osci into your synth. Now, this introduces 
some serious safety matters into a synth.
And I do not know if there are any tubes.

Anyway, if someone is interested, I could scan this.
The spdif optcial/coax converter schematic is
still missing. Can't find it yet.

m.c.