[Lowfer] LF Xtal on eBay

[W5JGV (Ralph Hartwell)]

> I keep preaching a
> 5.185 MHz 60 cent microprocessor Xtal divided by 28 works
> very well but I guess coming up with a divide by 28 counter
> is a stickler.

One easy way to so it is to use a pair of ancient SN7490's connected as
shown in the 1973 article available on my web site.

The direct link to the PDF file is:

http://w5jgv.com/downloads/SN7490-Divide-by-N.pdf

The article shows how to connect the 7490 to make it divide by any
integer from 2 through 10.  That means that you can use a pair of them
to divide by 4 and then by 7 to get a division of 28.

73,

Ralph   W5JGV - WD2XSH/7