Interesting! For the 2nd digit you'll want to have a look at the transistors by the display (Q1,Q2,Q3) and the resistors just below it (R14,R15,R16).titl wrote: ↑Mon Nov 16, 2020 6:55 amHi
The pdf and the video are very clear thanks for that.
I just finish the build, but i have two problems :
-The second number in the screen doesn't work.
-no gate on output.
I think soldering points are all ok, all ics are well powered, all the ground i can check are ok.
Do you have an idea to fix that?
A more likely culprit however is the header pin connections right near those resistors, as the header pins are sometimes quite difficult to solder correctly (particularly the male headers). I would recommend applying some flux and reflowing all the pins on that header if you don't spot anything else amiss. Additionally, the mating surfaces of the pins might have gotten oil or flux residue on them, so it's always a good idea to clean them off with alcohol before trying anything more difficult.
For the gate output, you'll want to inspect the LED, diode, and resistors right near the gate output. Double-check that the polarity of the diode matches the silkscreen. Again, the header pins near the gate output provide connection to the other board, so inspect those header joints and reflow them with some more flux if you are at all in doubt.