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Resistor: Color code, SMD code, Series & Parallel Value Calculator. Inductor: Color code , Series & Parallel Value Calculator & Inductor Design Tool. Capacitor: Capacitor code & Series , Parallel Value Calculator & CapacitorDesign Tool. LED Resistor Calculator. Filters "RC, RL & LC" Frequency Calculator. Op Amplifier "Non-Inverting, Inverting & Differential" Tool. 555 Timer "AStable & MonoStable " Tool. Star Delta Calculator.