Stan wrote:
The 5328A manual I have shows a 3.5 V supply (looks like it is used just
for the display). But with a bit lower Vce sat drops, I'd guess you
get around
1 V across the 10 ohm segment resistors. Or only about 900 mA when all
9 segments are on (but at a low duty cycle). Did HP also use a 5 V version
of the driver in some 5328A counters?
Interesting. I have 3 different sets of schematics for the
5328A. The most legible of these (thus the one I consult first)
shows a 5 V supply for the display. The other two show 3.5 V, as
yours does. I cannot recall ever measuring the display supply
voltage in a 5328.
Even with 900 mA per digit, I'd want a transistor with >/=2 A maximum
collector current for the digit drivers -- so I still think the
ZTX949 may be the best readily-available choice.
Best regards,
Charles
_______________________________________________
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.
