On 6/26/2012 2:25 PM, Jonathan wrote:
Hi all,
Anyway, I am using the blanking feature of the 74141 for the first time. It
seems that some of them don't blank as well as others and to get them all to
blank I have to dial the anode voltage down or lower tje pwm duty cycle which
prevents max brightness during the day. One of the 74141s blanks well and so
does a Russian equivalent that i have. So, am i doing something wrong and is
there anything I can do about it? I suppose I can cherry pick through my stash
for chips that blank well.
Thanks!
Jonathan
Jonathan,
The 74141 contains a ~55V Zener diode on each output. It isn't really intended
to perform blanking, despite what you might be led to believe from the truth table.
The Russian chips are said to have a higher voltage Zener diode than the
American parts, so go with those. Even so, you will need to reduce the HV to the
best compromise.
--
David Forbes, Tucson, AZ
--
You received this message because you are subscribed to the Google Groups
"neonixie-l" group.
To post to this group, send an email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/neonixie-l?hl=en-GB.
