On 4/18/2018 6:27 AM, Bob kb8tq wrote:
Hi If this is a new build, why use a 4046 in the first place? There are many newer parts that will do all sorts of things. If this is a repair of something that has been running for years, is it > 5V supply to the chips? If so, you are pretty much stuck with 4000 series CMOS. There are no fatal flaws in the 4046, but there are basic design limitations. Those have been well documented over the years and here on the list. Going to a better part is the answer for that stuff ( = get away from any xxxx4046 IC). Bob
Any 4000 series CMOS, besides being extremely slow (prop delay measured in MICROseconds), have a totem pole output that momentarily short circuits the power supply when switching and generates tremendous EMI. I once wasted several weeks of time running down a spur problem that I eventually traced to a 4XXX frequency divider. Rick N6RK _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
