[sdiy] frequency counter

[Magnus Danielson]

From: harrybissell <harrybissell at prodigy.net>
Subject: Re: [sdiy] frequency counter
Date: Sun, 27 Jun 2004 12:55:04 +0000
Message-ID: <40DEC3A7.2C07E163 at prodigy.net>

> I'd like to point out that tuning a VCO could also be done with a square
> wave reference and a 'beat frequency indicator' which could be made
> with an up-down counter method.   If you then took an x-or gate and looked
> at a lpf voltage output (like with an LED) you could probably get even closer.

In essens, any phase or frequency-phase detector with a suitable filter after
would do. My worry has always been on generating accurate intervals rather than
A4 and relatives.

A SR-flip-flop is a good example. XOR might do it too.

> This would be a lot easier than a frequency counter built in a VCO...

Sure is!

Cheers,
Magnus