[sdiy] frequency counter

[Magnus Danielson]

From: harrybissell <harrybissell at prodigy.net>
Subject: Re: [sdiy] frequency counter
Date: Sun, 27 Jun 2004 12:41:40 +0000
Message-ID: <40DEC084.43E27DE at prodigy.net>

> OTOH... any resonable high frequency crystal and the right division ratio
> would come acceptably CLOSE to A-440.  Much closer than almost ANY of
> our test methods would require... (even .1% would be easy)

If you buy a 11 MHz crystal in HC49 package, then a 30 ppm (0.0030%) is yours
for about 1 USD. A few caps, a resistor and a pair of spare CMOS inverters and
away you go. If you also add a divide by 11 (one IC) and a little flip-flop
(one IC) a pair of resistor, a cap and a varicap diode, then you can also
frequency-lock it to a suitable 1 MHz reference near you for additional
precission, as if that was needed. ;O)

No, that 11 MHz oscillator is more than enought for musical purposes.

Hmm... I really should have my 1 kHz tube-driven fork-magneticassmebly
reference oscillator up in action. Now THAT's a nice reference! ;O)

Cheers,
Magnus