[sdiy] frequency counter

[phillip m gallo]

Steve,

Try here,

http://www.intersil.com/products/deviceinfo.asp?pn=ICM7216B

I have a Universal Counter built from this that i use often.

regards,
p


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Steve Allen
Sent: Sunday, June 27, 2004 9:25 AM
To: music.maker at gte.net; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] frequency counter


Hi All,
 Anyone remember the ICL7216DIPI, that is a frequency counter on a chip?
Anybody know where a schematic/data sheet for this critter might be?

 Thanks,
   Steve

Scott Gravenhorst <music.maker at gte.net> wrote:
  WeAreAs1 at aol.com wrote:
  >
  >In a message dated 6/26/04 10:19:02 PM, music.maker at gte.net writes:
  >
  ><< There are circuits that can divide by numbers other than powers of 2.
I
  >figured out a circuit for a symmetrical output divide by 3. >>
  >
  >By "symmetrical output", do you mean square wave input > square wave
output?
  >Does it work with any frequency, or are there frequency selective
components
  >involved? It sounds like this could be a good alternative to the typical
  >octave divider circuit. What pitch interval does it make? (I'm hoping
that it's
  >a perfect 4th or 5th, and not the dreaded tritone)

  It is a perfect 5th (or 4th depending on how you look at it). And it is
  symmetrical as in 50% duty cycle or square wave. I used it as part of a
divider
  chain in a PLL frequency multiplier.

  http://home1.gte.net/res0658s/fatman/4046pll.html

  It has 7 outputs at 1F, 1.5F, 2F, 3F, 4F, 6F and 12F. All are square wave
outputs.
  1.5F, 3F, 6F and 12F all have perfect 5th relationships back to the
fundamental.
  This is very useful, IMHO. The divide by 3 circuit can indeed be used as a
  subharmonic without going the frequency multiplier route and it still has
the
  perfect fifth relationship.

  >
  >Mike B.
  >

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