On Tue, Aug 29, 2023 at 11:31 AM, Tony Scaminaci wrote:
Note that the source and drain pins are reversed from the BS170 so you’d flip the TN0606 upside down (flat side against the washer). Others have made this substitution with excellent results. Again, it’s a good idea to place a very thin layer of thermal grease on both sides of the transistors to maximize heat transfer to the board.
For best thermal contact between the round side of the transistor and the board, I recommend , which will better conform to the shape and provide more thermal contact. In this case I'd also probably swap out the steel washer for something more thermally conductive, such as aluminum or copper, since that's what's going to be making the best thermal contact with the transistor. The premium thermal solution would be an aluminum bracket that makes thermal contact with the enclosure, turning the entire thing into a heat sink.
