Multiplexing was Re: Information on the PPS-4/1 4 bit

Total side note: I've seen some that are optoisolators. The one clock I've dug into in enough detail to say anything about this is multiplexed by a factor of two, driven off mains power. Half the segments are (potentially) driven during one half of mains power, the other half of the segments during the other half of the power cycle. This means it flickers at 60Hz, which was apparently considered acceptable, and, actually, I'm not sure that's all that wrong a decision for its target purpose. I know that clock because I used it to make a _big_ clock to hang on the wall: I opened up a commercial clock, cut the ribbon cable between the main PCB and the display, probed the display to deduce its pinout, and wired up a bunch of LEDs in an electrically similar configuration forming digits about ten inches high. The original clock board fits, with plenty of space to spare, in a corner of the result. I even managed to find the 12/24 mode pin, so I didn't have to resort to logic hackery to convert a 12-hour-plus-am/pm-bit display into a proper 24-hour display. I'm proud of the result. :) /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B