AW: Analog tuner idea (try #2..no show)

[Haible Juergen]

I use to play octaves on the keyboard and play the VCO into an
echo (delay) FX, so the momentary tone will alway beat with the
tones played a moment ago ... not the finest method, but easy,
and it works.

There was another idea in EN, which I haven't tried yet, but which
looks very promising: Use a 2p2t switch which gives an offset of
1V to your VCO input and a :2 division (flipflop) to the VCO output
at the same time. If the scale is perfect, the pitch will stay constant.
Should be easier to detect than octaves.

Ringmod for beat detection: I once had a little circuit (from ELRAD,
I think), which had a TOS chip and a 4017 to drive 10 LEDs which were
located in a circle on the front panel. When your input signal was
slightly out of tune with the internal TOS-generated frequency,
the light would spin around like mad: cw if it was too low, ccw, if it
was too high.
Very nice optical effect, but not better or worse than any other guitar
tuner. Put it apart, when I needed the TOS chip for a different project.


> "Always put outputs to inputs and inputs to outputs. Putting outputs to
> outputs and inputs to inputs just won't get you anywhere you want to go."
>
>                        -From the Moog Modular Owner's manual

David Gilmour broke this rule and got some nice sound effects on
"A saucerful of secrets" (not with a moog, but with some filter pedal,
of course)
(:->)

JH.