Your very-hard-to-read negative schematic that is covered with chicken-pox dots is different from the schematic shown in the datasheet:I tried to make 20 led version, but I have a problem led 10 stays always on if voltage is above it's limit. In bar mode you can't notice it but it's clear in dot mode.
I tried to find the error to no avail. Please see attachment.
Thanks for turning off the chicken-pox dots.
But it is difficult to see details in the negative schematic. Pin numbers are not shown.
In the bar-mode, outputs Q1 and Q9 of IC2 are shorted to the positive supply.
I have added pin numbers by hand and update the above schematic.
Thanks, but it is still a negative pic. It should have dark lines on a white background.
The datasheet shows how to do it. In the BAR mode, you are shorting pin11 to the positive supply so its LED will never light.Do you mean the connections are not required between IC2 pins 9 and 11; IC2 pin 1 IC1 pin 9 ?
The second LM3914 has its pin9 connected to its pin11 (but not to the positive supply) only in the DOT mode. Then pin11 has a 20k resistor to the positive supply so that pin9 is high when the LED is turned off.