[sdiy] Tuning indicator

[Tim Ressel]

Hey all,

I've got one for ya: How do you build an indicator
that shows if one input frequency is higher or lower
than another frequency input? Kinda like a guitar
tuner. Would a phase-frequency comparator a la PLLs
work I wonder?

This is for a semi-automatic VCO tuning fixture. Some
day I hope to build several VCOs, and a gizmo that
makes the task faster would be neat.

--TR


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