James 
The answer is one sentence long, and the reasoning behind it is the part worth knowing: two diodes give full-wave rectification but only if the transformer has a centre tap, and four diodes achieve the same result with an ordinary transformer. The fourth pair exists to remove a requirement rather than to add a function. … Read more
The useful way to understand a bridge rectifier is to follow the current through it twice, once for each half of the incoming cycle. When you have done that, the four diodes stop looking arbitrary and start looking inevitable, and the shape of the output makes sense without any theory. Last updated: October 16, 2026 … Read more
For most hobby circuits the choice resolves in about fifteen seconds once you know two numbers: the highest reverse voltage the position will see, and how much forward drop you can afford. The rest of this article explains why those two numbers decide it, and where the answer stops being obvious. The short answer for … Read more
A Schottky diode does the same job as any other diode — it lets current through in one direction and blocks it in the other — and it does that job with less voltage lost and almost no delay when it stops conducting. That combination is why it turns up wherever a small voltage difference … Read more
Sooner or later everybody ends up with a handful of loose diodes and no idea what they are. The codes on the body look like they should be enough, and sometimes they are — but the same short code can mean different parts from different manufacturers, which is the trap worth understanding before you trust … Read more
One multiplication explains most of it: the voltage across the diode multiplied by the current through it gives the power it turns into heat. Everything else — why some diodes run cooler, why a heatsink helps, why the same part survives in one product and fails in another — follows from that number and from … Read more
Everything a diode does comes from one thin boundary inside it. The package, the leads and the markings are just delivery; the behaviour lives in a zone a few micrometres wide where two differently treated regions of silicon meet, and understanding that zone makes the rest of the device class predictable rather than mysterious. Two … Read more
Almost every beginner destroys something by fitting a diode the wrong way round, and the reason is nearly always the same: the band on the package marks the cathode, and most people assume the banded end is the positive one. Getting this single convention straight prevents the majority of early failures in this device class. … Read more
A diode is the simplest interesting component in electronics: it conducts in one direction and blocks in the other. What makes it worth learning first is that almost every power supply, every battery circuit and every electronic device you own depends on that single behaviour, and the rest of the device catalogue is variations on … Read more
Doubling the battery voltage looks like a simple change and behaves like a redesign. It halves the current needed for the same power, which is why it is attractive; it also changes what the semiconductors have to block, which is why silicon carbide ends up in the design rather than silicon. Last updated: October 11, … Read more
Every material used to make a semiconductor device can be described by one number: the energy an electron must gain to break free of the atomic lattice and start conducting. That number, the band gap, predicts how much voltage the material can hold, how much current it leaks when hot, and even what colour light … Read more
An inverter is the only part of a home solar system that works every day the sun rises, and it is usually the first major component to be replaced. Its efficiency is therefore not a laboratory number: every per cent is energy that either reaches your house or becomes heat inside a box mounted on … Read more
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