Q qtommer Member Jul 26, 2009 #1 In the ULN 2803 Darlington Transistor Array, there is a pin known as COM (pin 10) where all diodes are connected to. From the datasheet, i can only identify that these diodes are clamping diodes. Should I connect this pin 10 to VCC or GND? What is the purpose of the diodes attached to the collectors? Help is very much appreciated=)
In the ULN 2803 Darlington Transistor Array, there is a pin known as COM (pin 10) where all diodes are connected to. From the datasheet, i can only identify that these diodes are clamping diodes. Should I connect this pin 10 to VCC or GND? What is the purpose of the diodes attached to the collectors? Help is very much appreciated=)
W Wp100 Well-Known Member Jul 26, 2009 #2 Hi, Pin 10 should be connected to Vcc , it connects each diode across each relay to stop the emf from the relay coil. Last edited: Jul 26, 2009
Hi, Pin 10 should be connected to Vcc , it connects each diode across each relay to stop the emf from the relay coil.