I sent this on the 18th, but it didn't show up, so here goes another
try. I don't know if something's wrong with my email. Please excuse
if the redundant original shows up too.
Original message:
At low frequency, the HC parts should take very little dynamic
current - the big current draw is from biasing gates in the linear
region for oscillators and low-level signal triggering, for example.
Running them at minimum voltage should reduce the current a lot.
Sometimes it's best to separate the linear-biased items and run at
lower voltage, or from a slightly isolated version of the main
supply, via a resistor (and a bypass cap), to limit the current in
case anything gets stuck.
Ed
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