A selection of useful calculators for engineering applications. More will be added in the future so stop back and see!

**Resistor Calculators**

There is a 1% resistor finder, resistor divider, resistors in parallel and RC time constant calculator found in the Resistor Calculators.

**Microstrip Calculators**

There are microstrip impedance and differential impedance used for USB traces found in the microstrip calculators.

**Transmission Calculators**

There are line of sight VHF, power conversion and VHF signal loss found in the transmission calculators.

**Time Conversion Calculators**

There are POSIX, ISO8601, Windows Time, Julian Date, GMT, JavaScript time formats that can be found in the time conversion calculators.

**Splitter and Attenuator Calculators**

Find resistor values for Y splitter, T attenuator or Pi attenuator that can be found in the splitter and attenuator calculators.

**Power Conversion Calculator**

Convert voltage, dBm, dBu, dBV, or power to another form for a given impedance and waveform type in the power conversion calculator.

**ASCII Character Chart**

ASCII Character Chart that shows the symbols, hex values, octal values, decimal values, binary value and description of the character.

**EIA232 Reference Chart**

EIA232 Reference Chart that shows the pinout and signal names for DB25, DE9, and RJ45 connectors.

**1st Order Filter Calculators**

1st Order Filter Design for low-pass and high-pass filters. The calculators create analog component values, analog and digital filter coefficients.

**2nd Order Filter Calculators**

2nd Order Filter Design for low-pass, high-pass, band-pass and band-stop filters. The analog and digital filters are biquad filters. The calculators create analog component values, analog and digital filter coefficients.

**Analog Circuit Analysis with Excel**

Microsoft Excel ® has features that make it handy for analog circuit analysis. These include complex mathematics, cell labeling and the ability to overlay plots. An example of analysis of a 6th order LC bandpass filter using Excel is available here.