According to the b7971 datasheet, the maximum allowable current is 21mA. Yet when you add-up the currents for each cathode to produce the '8' or '*' characters, they add up to 40mA, which is way over the spec limit.
For those of you who design their clocks, did you scale-back all segment currents so they never exceed 21mA ? I'll probably current-limit each cathode individually, and put another current-limit on the anode. Even though that adds up to a lot of transistors for a direct-drive clock, these tubes are getting pretty scarce and expensive so I'm not taking any chances. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7e8a7e7a-c5e5-4e23-8ea7-1a98c63b59a4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
