I made a heat sink out of some thick aluminum sheet and used it for a negative voltage regulator (a 7915). The heat sink is a bit big and long, and is attached to the metal plate of the regulator which happens to be connected to the input pin. Because of this, I got worried that the heat sink might act as an antenna and attract EMI/RFI which would introduce noise to the input voltage. So I decided to insulate the heat sink by wrapping it in several layers of vinyl electrical tape. But now I'm wondering if doing this has reduced and badly impacted the heat transfer performance of the heat sink. Was this not good to do? What do you think?
Thanks!
Thanks!