Tip120 & Tip122 Transistor Switching Circuit

Final Step.

  1. All done. You should have something like this...

User-inserted image

Additional notes You may also use a Mosfet for this switching circuit. A IRL3103PBF mosfet can replace the TIP120/122 Darlington transistor. The circuit is the same however the pins on a Mosfet are named Gate, Drain and Source. The mosfet fits in the same place as the Darlington with the Gate to the left (replacing the Base of the Darlington).


Edit 1 (7th March 2013): Underside of board diagram added.

Edit 2 (7th March 2013): For some circuits a diode is needed as shown in the first schematic. The board here does have space for a diode (C4 to D4 - would have to be with legs bent to accommodate 0.1" spacing) however I have not shown one - watch this space.

Edit 3 (7th March 2013): Underside of board optional connections for D1 added.

Edit 4 (7th March 2013): Added diode information.

Edit 5 (18th March 2013): Added IRL3103 Mosfet information.


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