clock divider schems ...

[media at mail1.nai.net]

At 11:00 AM -0500 04/14/98, Yoshiki Ohmura (Yoshi) wrote:
>Does anybody have a good schematic for a clock divider?  ONe that takes
>24ppq in, and spits out 1/8, 1/4, 1/2 1/1 notes maybe?

-From vance at netcom.com Sat Apr 22 00:40:17 1995
Date: Fri, 21 Apr 1995 10:01:35 -0700
From: Vance Gloster <vance at netcom.com>
To: media at pcnet.com
Cc: tmoravan at netcom.com, analogue at hyperreal.com
Subject: Re: Divide and Multiply

> I'm looking for a thing that someone must have built in the past - a simple
> box that provides 1/2 and 2x of a trigger pulse sent into it.  ie - take a

The 2x trigger is a little involved, but here is a circuit that will
do divide by two preserving pulse width.

                                          +5      ______
                                ______    o______|      \
In o___________________________|      \          |       \
        |                      |       \         | NAND   )O__________o out
        |                      | NAND   )O_______|       /
        |              ________|       /         |______/
        |             |        |______/
        |   ______    |_________________
        |__|      \       ___________   |
           |       \     |           |  |
           | NAND   )O___|\ clk      |  |
   +5 o____|       /     |/        Q |__|
           |______/      |           |
                         |         _ |
                     ____| D       Q |__
                    |    |           |  |
                    |    |           |  |
                    |    |  D-type   |  |
                    |    | Flip-Flop |  |
                    |    |___________|  |
                    |___________________|

You can use a 74LS00 for the NAND gates and a 74LS74 for the
flip-flop.  I think both are available at Radio Shack.  Enjoy!

-Vance Gloster