The 3 power supply configuration would be better.
Did you include the 10K ohm pull up resistor on the shift register circuit? That was added recently to the circuit diagram and it helps prevent all the relays from switching on during power up.
Also see this post:
http://nosack.com/sipforum/showthread.php?tid=70&page=3
Look for number 25 for info about connecting the external power to the relay board.
Did you include the 10K ohm pull up resistor on the shift register circuit? That was added recently to the circuit diagram and it helps prevent all the relays from switching on during power up.
Also see this post:
http://nosack.com/sipforum/showthread.php?tid=70&page=3
Look for number 25 for info about connecting the external power to the relay board.