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