吃瓜tv / capacitor polarity吃瓜tv / Component-to-board engineeringCapacitor polarity: identify the terminal, then verify the padA stripe is a clue. An exact part number, terminal definition and matching assembly drawing are the evidence. Use this guide to resolve polarity before an assembled board is powered.Photographic examples…
Read articleCapacitor for Arduino guide: decoupling values, crystal loading caps, reset circuits, motor noise filtering, and PCB layout rules every maker should know. If you’ve ever had an Arduino randomly reset when you turned on a motor, seen an ADC reading jump all over the place for no obvious reason, or watched a sketch upload fail […]
Read articleCapacitor failure can appear as capacitance loss, excess impedance, leakage, an open connection or a short. Use the capacitor technology, circuit conditions and physical evidence together to decide what to test next. A noisy rail or intermittent startup does not identify a failed capacitor by itself. Start with the exact part number and its function […]
Read articleCapacitor ESR explained: what causes it, why it matters for SMPS ripple and stability, typical ESR values by capacitor type, how to measure it accurately, and a full reference chart and FAQ for PCB engineers. Walk into any electronics repair shop and ask why a switching power supply failed. More often than not, the answer […]
Read articleLearn how to design a capacitor bank correctly 鈥� covering parallel and series configurations, DC link sizing, PFC resonance risks, current sharing, anti-resonance, inrush protection, and PCB layout rules. With formulas, tables, and a full FAQ. Every experienced PCB engineer has made this mistake at least once: you need more bulk capacitance on a DC […]
Read articleCapacitor aging is a change in electrical performance with time and exposure. For liquid-electrolyte aluminum capacitors, electrolyte loss and temperature-dependent processes can reduce capacitance and increase losses. The practical engineering question is whether the selected part still meets the circuit requirement under its actual electrical, thermal and storage conditions. A calendar age or a single […]
Read articleBypass capacitor guide for PCB engineers: covers SRF, value selection tables, placement rules, common mistakes, and IC-specific strategies for clean power rails. Every experienced PCB engineer has been there. The board passes simulation, the schematic looks correct, and then on the bench the microcontroller locks up randomly, the ADC readings are noisier than expected, or […]
Read articleAn audio capacitor should be selected for its circuit function, operating stress and measured effect, not an assumed sound signature. Coupling, supply bypass and loudspeaker crossovers impose different requirements. A good part in one position can be impractical in another. This guide explains the calculations, dielectric choices and prototype checks needed before releasing an audio […]
Read articleLearn when and why to use a 10000uF capacitor 鈥� covers high-power audio amplifier supplies, motor drives, inrush current protection, ESR selection, voltage derating, and PCB layout tips. Practical guide written from a PCB engineer’s perspective. Most power supply designs never need more than a few hundred microfarads. Then you hit a class A amplifier, […]
Read articleThe 4700uF capacitor is the backbone of high-current PSU filtering. Learn ripple calculations, ESR specs, voltage derating, layout tips, and top manufacturer comparisons. When a power supply needs to deliver serious current 鈥� think 5A, 10A, 20A and beyond 鈥� the filter capacitor can no longer be an afterthought. At that scale, a 4700uF capacitor becomes […]
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