You don't specify, but if you are using 74141's, then I would say that
is very normal. I believe that each 74141 uses 25ma of current.. So,
150ma just in the driver IC's. Worse, if you're using a linear regulator
to get that 150ma @ 5v, then you are turning the rest of your
wall-wart's voltage into heat. If it is a 9v wall-wart, then 150ma @ 4v
is now heat. If it is a 12v wall-wart, then 150ma @ 7v is heat.. etc.
Anyways, long story short.. Yes, those numbers sound about normal to me.
You can do the calculations very easily to work it out for yourself, though.
-Adam
On 5/8/2012 11:45 AM, seaforth23 wrote:
Hi,
It is a while since I built a Nixie clock. Just finished one using
Moses chip, Tayloredge hv psu, and 6 IN-16 tubes, 2 blue led's.
Standard 7805 regulator, fed from 9v. Curent is almost 600ma when
running. Regulator gets pretty hot (though ok with heatsink). Nothing
else gets warm and clock seems to run OK. Does this seem normal?
Would appreciate your thoughts. Thanks, David
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