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Tutorial
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Steps

  1. Parts Needed.
  2. Schematics.
  3. Step 1. Method:
  4. Step 2.
  5. Step 3.
  6. Step 4.
  7. Step 5.
  8. Step 6.
  9. Step 7.
  10. Step 8.
  11. Step 9.
  12. Final Step.

Tip120 & Tip122 Transistor Switching Circuit

Step 12 of 12
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).

Updates:

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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