Use an Ohm meter to check the resistance between the aluminum and the power
transistor heat sink (collector). There should be no reading. If the reading is 0 ohms, this
indicates a short circuit between the transistor and the aluminum plate. Check the
insulating bush. You may have placed it in the wrong direction. Attach this assembly to the
PCB later.
Now, let's assemble the speaker. Use M2 screws.
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