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Tools

	4 Band, 5 Band and 6 Band Resistor Calculator Tool Graphical resistor calculator tool.Quickly understand the resistor color code.
	PCB Trace Width Calculator Internaland External PCB Trace calculator tool.
	Wire Self Inductance Calculator Wire, Parallel Wire, Coax, Wire over Plane, Loop, Rectangle Loop, Coil, Broadside Trace, and Edge Coupled Traces

Metering

DS1621 PC Thermometer Requires No External Supply

Here is a tiny DS1621 based PC thermometer using PC's RS232 port for transferring data and getting the power. It displays the measured temperature on the taskbar. It plugs in any free PC com port.

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Frequency Meter for 10 Hz to 100 kHz Input by 74121

This frequency meter is suitable for sinusoidal wave and square wave input signals. Minimum input potential must be 25mV(rms). Measurement range can be determined from 10 Hz to 100 kHz by using the S1 switch.

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