seven segment display history

On Sat, Mar 01, 2008 at 08:54:10PM -0800, Brent Hilpert wrote: Oh, yeah. I even have one of those 6-digit Heathkit clocks. Still, the trick with those is that some of the Sperry/Beckman displays have keep- alive-anodes, and some do not. From the one link that was recently posted, it's clear that there was a large variety of displays made back in the day, and you could select a display for your requirements (especially how many primary anodes for multiplexing). In this case, I have a particular display, one of the more complex ones, looking for an application; not the other way around. Still... I'll have to go digging for some Heathkit schematics anyway. ISTR that my clock is a little funky - either the displays are wearing out, or I have something going off in the driver circuit. I _think_ the symptom was that as the clock warmed up, segments that shouldn't be lit started to fade in, then the clock went to 88:88:88. -ethan -- Ethan Dicks, A-333-S Current South Pole Weather at 2-Mar-2008 at 06:59 Z South Pole Station PSC 468 Box 400 Temp -54.9 F (-48.3 C) Windchill -89.2 F (-67.3 C) APO AP 96598 Wind 12.5 kts Grid 13 Barometer 688.3 mb (10317 ft) Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html