... power supply loop of every kinds of power supply, ballast / CFL etc. and the heating loop of CRT ... in Switching Power Supply, UPS Power Supply, CFL, Ballast, Circuitry of Power Supply, etc.WMF21 series NTC thermistors ... power supply loop of every kinds of power supply, ballast / CFL etc. and the heating loop of CRT ... Switching Power Supply, UPS Power Supply, CFL, Ballast, Circuitry of Power Supply, etc.