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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. |