Electronics Repair and Power Planning

Translate one explicitly ordered four-band resistor marking, preserve its source and orientation, and optionally compare a complete measured resistance interval without identifying or approving the component.

Calculate equivalent resistance for two resistors in series or parallel. Free series and parallel resistance calculator for circuit design, hobby electronics.

Calculate output voltage from a two-resistor voltage divider. Free voltage divider calculator for circuit design, hobby electronics, and prototyping.

Size the series resistor for safe LED operation. Free led current limiting resistor calculator for circuit design, hobby electronics, and prototyping.

Check DC rail currents, combined continuous and pulse watts, and event duration against the selected supply’s documented operating-condition ratings.

Estimate runtime from battery-side current or usable watt-hours with per-state losses, including sleep time, reserve and discharge conditions.

Compare actual regulator operating envelopes and check LDO dropout, current and board thermal estimates; retain unresolved compatibility conditions.

Compare documented AWG current allowances, connector limits and actual loop resistance; identify wire candidates that meet the entered voltage-drop limit.

Calculate actual resistor heating and compare derated continuous power and working-voltage limits; keep waveform and temperature conditions explicit.

Calculate capacitor voltage after a step or time to a threshold using actual initial and final voltages; distinguish unreachable and asymptotic targets.

Estimate required trace width for a given current (1 oz copper, external layer). Free pcb trace width calculator for digital electronics, PCB design.

Size bulk and ceramic decoupling caps for IC power transients. Free decoupling capacitor calculator for digital electronics, PCB design.

Resolve force and lever angle into output torque, then calculate geared motor torque and mechanical power without inventing electrical current.

Check actual motor winding-current requirements, event duration and supply range against a documented driver; keep application compatibility explicit.

Sum actual subsystem rail voltages, currents and conversion losses, then compare continuous and simultaneous peak battery power at the minimum voltage.

Budget complete robot missions from battery-side state power and usable pack energy, apply reserve once and compare the number of whole missions.

Simple in-browser notepad with auto-save. Write quick notes that persist in your browser. Download as text file. No signup needed.

Calculate DC path drop or approximate single-phase and balanced three-phase AC drop using actual conductor data, circuit current and a chosen limit.

Calculate charge used between states of charge and record equivalent full discharges from measured throughput; keep capacity basis and limits explicit.

Solve an ideal resistor from six explicit pairs of voltage, current, resistance or power; handle zero-load and indeterminate inputs accurately.

Calculate UART character timing and throughput at a given baud rate. Free uart baud rate timing calculator for digital electronics, PCB design.