I'm very new to electronics and I made this simple circuit using my Raspberry Pi, a 74HC595 (8-bit shift register) and 8 LED's.

I wanted to use a HW-131 breadboard power supply to avoid drawing to much current from the RPi board directly, but I cannot get it to work.

This is how I wired it up  :

The problem: this does not work. All kind of strange behaviors occur when I test it.

This second configuration  ,however, works. I'm simply using the RPi 5V pin to power the IC and the LEDs:

Is there a way to power my LEDs (and maybe the 74HC595) with the breadboard power supply  ?

By the way, the Raspberry Pi (Zero 2W) outputs a 3V3 signal (on the serial data pin, clock pin and latch pin connected to the 74HC595).

Thanks !

I'm very new to electronics and I made this simple circuit using my Raspberry Pi, a 74HC595 (8-bit shift register) and 8 LEDs.

I wanted to use a HW-131 breadboard power supply to avoid drawing to much current from the RPi board directly, but I cannot get it to work.

This is how I wired it up:

The problem: this does not work. All kind of strange behaviors occur when I test it.

This second configuration, however, works. I'm simply using the RPi 5V pin to power the IC and the LEDs:

Is there a way to power my LEDs (and maybe the 74HC595) with the breadboard power supply?

By the way, the Raspberry Pi (Zero 2W) outputs a 3V3 signal (on the serial data pin, clock pin and latch pin connected to the 74HC595).