Lm317 einstellbare Spannungs regler platine Digital anzeige Strom versorgungs modul doppelseitiger Stromkreis Kühlkörper DC5-30V/ AC 3-21V - AliExpress
LM317: Significance of Junction to case (Top & Bottom) thermal resistance in TO-220 packages that are mounted vertically on a PCB - Power management forum - Power management - TI E2E support forums