Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Phantom Voltage (V)

Phantom supply voltage; P48 is 48 V.

Feed Resistor (Ω)

Value of each of the two series feed resistors.

Compute P48 phantom current per microphone as currentMa = phantomVolts / (feedResistorEachOhms * 2) * 1000 through the series pair of feed resistors. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Current Per Mic (mA)

Quiescent current drawn by one mic input.

• Microphone sensitivity, SPL limit, directivity, and phantom-power calculations depend on frequency, load, reference pressure, weighting, polar pattern, preamplifier noise, distortion criterion, supply circuit, and acoustic environment.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Mic Sensitivity mV/Pa

  Convert microphone sensitivity from dBV per pascal to millivolts per pascal as mvPerPa = 10^(sensitivityDbV / 20) * 1000, referenced to 1 V/Pa.

• ESR Power Loss

  Compute capacitor ESR power dissipation as RMS ripple current squared times equivalent series resistance.

• Laser Slope Efficiency

  Differential optical power per drive-current change above laser threshold.