I tried 4 new sn754410 non of them worked. the motor sits still.
its for a dc motor
pin 1,2,7,16 was connected to plc that has 5 volt outputs (2 and 7 one at a time)
pin 8 to positive side of 12 volt 1 amp power supply
pin 4,5 to negative
pin 3,6, to motor
I checked with voltmeter on pins 1,2,7,16, the actual voltage was 4.83 volts
I checked pin 8 and it was 12 volt
I never used this ic before
I don't see why it shouldn't work. I guess I miss something