11 Services from electronics-calc.x402tookit.com

Calculates the required series resistor for an LED given supply voltage, LED forward voltage, and desired current, returning exact resistance, nearest E12/E24 standard values, and actual current with that resistor.

Returns the nearest standard resistor values above and below a target resistance for a chosen E-series (E6–E192), along with percent error for each neighbour.

Converts between decibels and linear ratios (power or voltage/amplitude) and between dBm and milliwatts/watts.

Given any two of voltage, current, resistance, and power, calculates all four values with engineering-unit formatting.

Calculates energy consumption (kWh) and running cost of an electrical device per hour, day, month, and year from its wattage, daily usage hours, and electricity price.

Estimates how long a battery will last given its capacity (mAh/V or Wh), load (mA or W), converter efficiency, and usable depth of discharge.

Computes RC filter cutoff frequency, time constant, and capacitor charge times (63%, 90%, 95%, 99%, 99.9%) from resistance and capacitance values.

Decodes 3–6 resistor color bands to ohms, tolerance, and temperature coefficient, or encodes a resistance value into 4 or 5 color bands.

Calculates astable oscillator frequency, period, duty cycle, high/low times, or monostable pulse width for an NE555 timer circuit given resistor and capacitor values.

Returns AWG copper wire diameter, cross-sectional area, resistance per km, and optionally calculates voltage drop and power loss over a given run.

Calculates output voltage, current, and power dissipation for a resistor voltage divider given R1 and R2, or finds the R2 needed to achieve a target output voltage.