[sdiy] DIY strobe tuner?

[anthony]

The Infinite Flanger design has a rudimentary setup to compare the clock 
frequencies of the fixed and variable BBD clocks. It uses a 4013 flip-flop 
and 2 LED's. Some other parts added might yield up a passable strobe-tuner.

I thought of using 7-segment displays having the other ring of LED's move 
clockwise or counterclockwise for sharp or flat. Then I thought just doing 
it with individual LED's would make more sense...

aa
> >I'm pretty sure that there is a sufficiently simple solution with analogs
>>and a few simple digitals that can do the trick.
>
> I could sweat that Harry or Jim P built something similar some time back, 
> using a frequency reference, an up/down counter, and a demux driving an 
> LED array.  The reference drove the up input, and the device being tuned 
> drove the down input.
>