First, i would say a big thanks for your job, like because i can to concretize an old dream.
I am making a MCP panel and I have realised a PCB with all fucntion for a Zibo 737.
All works except the 74HC595 for the led buttons (ex NAV, F/D, VOR LOC...)
I have used your schema at the end of this page:
but, the led don't bright.
My question is, on your schema, there is a red point on the SRCLR pin but no wire, so I don't have solder this pin. I must to solder with the VCC (+5V) or not?
For more information, i have connected the 74HC595 to PIN 4 of the arduino (SIG) and the L and D bus. In the configurator, on the pin 4, I use LED Driver with 1V for "Volts - below this bus volatage the display is OFF"
Thank you very much for your response.