What I want to do is to use a ULN2003 to drive the relays and, in turn, drive the ULN via the digital IO pins from the arduino. I'd also like to include an LED for each relay to indicate it's status. This is the first time I've ever done this, so am seeking some feedback on the schematic. ULN2003 is a relay driver IC consisting of a darlington array. It is made up of seven open collector darlington pairs with common emitter. Moreover, ULN2003A has a capability of handling seven different Relays simultaneously. A single darlington pair consists of two bipolar transistors and operates in the Relay Driver Schematic. Advantages of the low side driver. Easy to interface to low voltage logic circuitry. Far more interface options including the The ULN2003 has internal clamp diodes. While these work OK in non-critical applications, I have had problems with them generating "glitches" in ULN2003A HIGH-VOLTAGE HIGH-CURRENT DARLINGTON TRANSISTOR ARRAY Components datasheet pdf data sheet FREE from Datasheet4U.com Datasheet (data sheet) search for integrated circuits (ic), semiconductors and other electronic components such as resistors, capacitors, transistors Edgefx provides a video tutorial on relay driver uln2003 circuit ic pin description and used to drive relay switch on and off ULN2003A IC is one of the most commonly used Motor driver IC. This IC comes in handy when we need to drive high current loads using digital The ULN2003 is a 16-pin IC. It has seven Darlington Pairs inside, where each can drive loads up to 50V and 500mA. For these seven Darlington Pairs we * ULN2003 has a 2.7kW series base resistor for each darlington pair, allowing operation directly with TTL or CMOS operating at a supply voltage of 5V. These devices will handle numberous interface needs particularly those beyond the capabilities of standard logic buffers. * ULN2003 is the original The ULN2001, ULN2002, ULN2003 and ULN 2004 are high-voltage, high-current Darlington arrays each containing seven open collector Darlington These versatile devices are useful for driving a wide range of loads including solenoids, relay DC motors, LED display filament lamps, thermal printheads