[sdiy] Tuning indicator

[jhaible]

> Hah... I remember that better than you....

Your description looks familiar. It's probably the same
device. I really don't remember the details.

JH.

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> we had a different version in the states... but it uses
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> an up/down counter... the guitar gets squared up and causes the
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> counter to go up, the reference makes the counter count down...
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>
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> when the frequencies are close the LED steps at the beat frequency
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> rate.
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> There was another flop-flop at the overflow... that latches the direction
of the count... so if you are way off it indicates
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> 'too high' or 'too low'....
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>
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> An alternate design from EDN or Electronic Design (late 70's maybe
>
> early 80's) used four LEDs to achieve the same effect.
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>
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> I too... lost it all except the TOG chip ;^P
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>
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> You might use a bicolor LED driven between two op-amps ... one
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> for reference and one for unknown frequency... and watch the
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> color change. In beat, they should change very slowly...
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>
>
> H^) harry
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> >
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> >>Here's how I would do it...  (and most of you know that I almost never
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> >>do things the normal way).
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> >>[...]
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> >>I'm surprised nobody makes tuners like this.  It would be so much
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> >>better than those cheezy digital tuners.  Sure it'd be expensive,
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> >>you'd need one of these displays for each of the 12 chromatic notes,
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> >>but it would be so nice to use.
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> >>
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> >>  -- Don
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> >Hi Don,
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> >I have seen (and built from a kit) something very similar.
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> >I don't remember all the details, but it worked with a counter
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> >(4017 ?) instead of a bargraph, and the LEDs were arranged
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> >in a circle. So when the the guitar tone was too high, the LED
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> >light would circle in clockwise direction, and when it was too
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> >low, in ccw direction. This was very nice too look at, and
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> >if also was very intuitive because you had to turn the screw
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> >on your guitar head in opposite direction of the LED point.
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> >I have thrown this box away when I had given up to learn
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> >the guitar, and after I canibalized it for theTOS chip.
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> >The kit was presented in a German electronics magazine,
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> >I guess Elrad or maybe Elektor.
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> >JH.
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