can I just plug the shift register's vcc to an arduino pin?
I've made the exact same circut, connecting the capacitator/diode/resistor to the !SRCLR pin (!MR), while the arduino boots, the 74HC595 output is it's last state (I want to have the state 00000000).
What if I just power the 74HC595 through an opto-isolator?
What is a known state? I
What is the solution you used to prevent the shift register to start at a random state?