74HC595A Shift Register Outputs Low Level?
Posted: Wed Apr 07, 2021 2:03 am
Hi
I'm working on a project, prototype everything on a breadboard and after testing soldered everything on protoboard.
I used the TI 74HC595 chip (component data source reference: sale item) in my prototype, I wanted to have everything on a PCB so I built schematic and ordered PCB with SMD assembly from JLCPCB.
Now I got the PCB and couldn't figure out why my leds are not working, tried to measured the voltage that the shift registers output and got very small voltage (less then 1 volt I think).
Is there anyone have ideas of it? I cannot get high voltage (>3v) in order to drive a led? Many thanks.
I'm working on a project, prototype everything on a breadboard and after testing soldered everything on protoboard.
I used the TI 74HC595 chip (component data source reference: sale item) in my prototype, I wanted to have everything on a PCB so I built schematic and ordered PCB with SMD assembly from JLCPCB.
Now I got the PCB and couldn't figure out why my leds are not working, tried to measured the voltage that the shift registers output and got very small voltage (less then 1 volt I think).
Is there anyone have ideas of it? I cannot get high voltage (>3v) in order to drive a led? Many thanks.