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Hi Skyraider, I have the same glowing decimal points problem as you, but on the cylinder clock, the digits that cause the problem are different, but they equate to the same output pins on the K155 (pins 10,11,13 & 14) which equates to input C on the K155 ie binary 0010, presumably there is some ...

Thanks very much, I'd only managed to work out a few bits of the circuit that I was working on, very useful.
Kevin.

Hi Tony, I've spent quite a lot of time attempting to work out what's going on. 1) The 12/24hour LED (Second from left) will only be displayed, when the alarm set LED (far left) is also on, if the alarm is off, the 12/24hour LED will never be displayed. (Bug) 2) The AM/PM LED (third from left) does ...

Hi Tony, How do I get the AM/PM indicator to work correctly when I'm in 12 hour mode? Currently the 12/24hour mode LED (Second from left) seems to mirror the alarm set LED (far left) and the AM/PM LED (third from left) doesn't do anything? What am I doing wrong? When I'm setting the time all 4 orang...

Hi, is there any current limiting into the backup capacitor? I want to fit a 4F capacitor in place of the 0.1F, but I'm worried this might cause power up problems if it tries to take too much current on power up, causing the R8 "fuse" to go high resistance and so produce a slow 5V build up...