How to make an H-bridge

Step 8 Solder even more wires.

Connect the middle pin of the first relay to the 9V input on the voltage regulator. Connect the middle pin of the second relay to ground (the place with all the black wires connected together). Connect the middle pin of the third relay to the 9V input on the voltage regulator. Connect the middle pin of the fourth relay to ground (the place with all the black wires connected together).

For clarification see images below.

Comments

[Nu]

The relays are being counted from right to left. The fist relay is the one farthest to the right, the second is the next one to the left and so-on. Thanks Nu