led - how to electrically isolate a PCB from a heat sink - Electrical Engineering Stack Exchange
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ESP - Heatsink design and transistor mounting
Amazon.com: Xiaoyztan 100 Pcs TO-3P Alumina Ceramic Insulator Pads, Power Devices Heatsink Insulation Pad for MOS Transistor IGBT Transistor Heat Sink, 20 x 25 mm : Electronics