Re: 4017 Counter skips under load

David L. Jones <altzone@xxxxxxxxx> wrote in sci.electronics.design:

[...]

Problems:
1) You are driving the relays directly with a 4017, that's *bad*. A
4017 will not have enough output current to do that. You are using low
power reed relays, but it's still too much for a 4017.

2) You can't use a relay driver board to provide clock pulses to a
4017, in fact this probably the worst possible way I can think of to
do this. You'll get ridiculous amounts of contact bounces causing
multiple pluses.

I've always taken for granted (meaning I never checked) that reed
contacts don't bounce. Not that that would make them an appropriate
device for clock generation.

Anno
.