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Old November 18th 03, 11:36 PM
Dr. Grok
 
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In article , wrote:
Hi

for my quite unstable counters I've got some 0.1ppm 9.6MHz VCXO's
(guaranteed over temperature range -20...+20°C), the problem is that
the original XO is 1MHz with 7490 divider, and now I need a divide by
96 downcounter. The VCXO drives a 74LS14, so it shouldn't be any fan
out problem, but I am not aware what is the readily available divider
to choose. The counter is mentioned on
http://home.online.no/~la8ak/m21.htm , but it is Norwegian text

hpe 2 hr fm u

73
Jan-Martin, LA8AK
http://home.online.no/~la8ak/d.htm

You can make a ÷3 out of a couple of J-K flip-flops, then use that to clock a
5 stage binary counter. That way you get 50% duty cycle square waves at 1.6
MHz, 800 kHz, etc. all the way down.

Just a suggestion -- there are many other ways.

Dr. G.

 
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