Darlington Driver (ULN2803A)
This is an 18 pin ‘chip’ that contains 8 darlington transistors similar in value to the BCX38C. The ‘chip’ also contains internal back emf suppression diodes and so no external 1N4001 diodes are required when driving motors and relays.
The ULN2803A is also called a 'low-side switch' - The load connects between the transistor output and V+ and the transistor conducts current to 0V when turned on.
There is no specific ULN2803A create module but the BCX38C darlington transistor create modules may be used instead (shown connected to buzzer).
Bill of Materials
|ULN2803A Darlington Driver ||ICO050 ||1 ||Buy Now |
|18-pin 0.3" DIL IC socket ||ICH018 ||1 ||Buy Now |
|100nF miniature polyester capacitor ||CAP001 ||1 ||Buy Now |
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