Instructions
Begin your game and head to the auto shop location on School grounds. Climb to the roof, and you will find the first of the transistors on top of the building. If you have completed the "A Little Help" mission, you may have already picked it up. You can exchange this transistor for the first move, the uppercut.
Go into the basement of the main school building to find the second transistor near the furnace. You can also find it while completing the "Help Gary" mission. This you can exchange for the leg sweep attack.
Travel to Bullworth Town, and go into the basement at the Dragon Wing comic shop. You'll find the nerds' hideout in the basement, and your third transistor on their desk. This unlocks the roundhouse kick.
Go behind the Mexican restaurant in town, across the alley from the bike shop. The transistor will be sitting behind the restaurant, and will give you the heavy kick move.
Go to the dam between Old Bullworth Vale and Bullworth Town. Climb up to the walkway and walk along it. The fourth transistor will be sitting there, waiting for you. Exchange this transistor for the 5-hit combo.
Travel to New Coventry. Head for the northernmost part of the map. You will see a "road closed" sign, and a door behind it. Open the door to step into an alley beside the tenements. This will be your sixth and final transistor. The Hobo's move for this part is the overhead punch.