Capacitor Values Explained: pF, nF, µF, Series, Parallel and Voltage Ratings
A practical guide to capacitor values, pF/nF/µF conversion, series and parallel combinations, polarity and voltage ratings.
Resistor Colour Codes Explained: 4-Band Values, Tolerance and Power
Learn how to read 4-band resistor colour codes, multipliers and tolerances, plus practical repair tips and a free calculator.
Ohm’s Law for Electronics Repair: Voltage, Current, Resistance and Power
A practical electronics repair guide to Ohm's law, power calculations and worked examples for bench diagnosis.
Output Transformer Impedance Explained for Valve and Tube Amplifiers
Learn how valve amp output transformer turns ratio, impedance ratio and reflected speaker load relate, with a worked example and free calculator.
Speaker Impedance Explained: 4Ω, 8Ω, 16Ω, Series and Parallel
A practical guide to guitar and PA speaker impedance, including 4, 8 and 16 ohm loads, series and parallel wiring and amplifier matching.
Valve / Tube Bias Explained: Plate Voltage, Current and Dissipation
A practical guide to valve and tube amp bias, plate voltage, plate current and plate dissipation, with examples and a free bias calculator.