SparkFun COM-00312 Darlington Driver 8 – Channel ULN2803 DIP
8 Darlington Arrays in 18-Pin DIP Package part # ULN2803A. Perfect for running relays and high-power devices up to 500mA and up to 50V!
Resources: Nuts and Volts article on Driving High Current Loads
Documents: ULN2803A Datasheet
LozK –
Did just what I wanted it to – allowed me to switch several relays in one inexpensive package.
Griff –
Using a couple of these to COMPLETELY opto-isolate my Control Electronics from the heavy electronics and electrics in a mill. Very useful, and means all my control electronics is safe from any nasties…