• DIY Bench Power Supply #11 – Heat Transfer between Transistor and Heatsink / Thermal Resistance Pt2

    Posted in: Video

    Part 2 examining the various materials used to transfer heat from a TO-3 power transistor (2N3055) to the heatsink

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  • In this video I examine the various materials used to transfer heat from a TO-3 power transistor (2N3055) to the heatsink and how their thermal resistance can affect this.

    Materials used:
    * Adhesive mica and heatsink compound / paste
    * Heatsink compound only
    * Metal to metal with no insulating / thermal transfer material
    * Mica TO-3 washer only
    * TO-3 silicone washer only
    * TO-3 silicone washer and heatsink compound
    * Active cooling with a fan

    Then a stress test of the 2N3055 Transistor…with and without cooling

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