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Adafruit ULN2803: 8 Channel Darlington Driver (Solenoid/Unipolar Stepper) - ULN2803A
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Please note, this is an 'open collector' driver - it can only be used to connect the load to ground and there will be a 1 Volt (or more) 'drop' across the internal transistors. The inputs can be driven by 3.3V or 5V logic. Fits nicely in any breadboard or perfboard.