Diagnose faults, replace components, use multimeters, and safely repair common consumer electronics.
Fixers learning to repair gadgets instead of replacing them
Learn multimeter basics
Identify common failed parts
Practice desoldering
Repair one simple device
Start with the closest real-world task, then use the mapped tools inside each guide.
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Filter and categorize specialized tools in this niche field by functionality and complexity.
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.
Compare documented annual electricity use for two appliances using one local rate, entered upgrade cost, and explicit planning horizon.
Reproduce one source-labelled electrical load schedule from connected volt-amperes and explicitly copied line multipliers—without choosing code factors or sizing a service, feeder, conductor or breaker.
Estimate appliance kWh and cost by day, week, average month, current calendar month, and year, with an optional regional CO₂ factor.
Measure rectangular, circular and annular concrete groups with depth ranges, counts and voids. Reconcile exact bag yields or ready-mix terms and save source-owned planning records.
Size a DC power supply for total load current with safety margin. Free power supply sizing calculator for power supply design, embedded systems, and wiring.
Estimate battery run time from capacity and load current. Free battery runtime calculator for power supply design, embedded systems, and wiring.
Estimate copper wire ampacity and diameter from AWG gauge. Free awg wire current capacity calculator for power supply design, embedded systems, and wiring.
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.
Calculate power dissipated in a resistor and check wattage rating. Free resistor power dissipation calculator for circuit design, hobby electronics.
Solve for voltage, current, resistance, and power from any two known values. Free ohm's law calculator for circuit design, hobby electronics, and prototyping.
Calculate RC charge and discharge time constants from resistance and capacitance. Free rc time constant calculator for circuit design, hobby electronics.
Calculate UART character timing and throughput at a given baud rate. Free uart baud rate timing calculator for digital electronics, PCB design.
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