ElectronicsNotes by Ian Poole
@ElecNotes
Clear summaries, information & videos about electronics, radio & connectivity by Ian Poole . . . tech influencer
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Understanding Transistor Constant Current Sources Constant current sources are used in many circuits where, as the name says, a constant current level is needed. For less demanding circuits a single transistor circuit can be ideal. What is a Constant Current Source? A constant…
2 Metre Ham Band Cubical Quad Antenna This details a 2 metre cubical quad antenna I made many years ago. Although intended for internal use, it gave good results over a number of years. This quad antenna can be made quite simply by constructing a simple wooden frame. Each…
A Guide to Superhet Radio Technology - ebook This book covers all the basic aspects of the superhet radio. The aim was to provide all the essential elements of the superheterodyne radio in one volume, explaining the background, the basic concepts and the function and operation…
What is Electrostatic Discharge, ESD: the basics Electrostatic Discharge or ESD is a fact of everyday life and it is of particular importance in the electronics industry these days. Years ago when thermionic valves / vacuum tubes were used it was not a problem, and even with…
Phototransistors vs Photodiodes: Choosing the Right Sensor for Your Light-Detection Application This comprehensive guide details the technological differences between photodiodes and phototransistors, looking at their relative advantages and disadvantages, and the different…
Understanding Transistor Gain: hFE, hfe & Beta, β - what’s the difference between them? Current gain is one of the important electronic circuit design specifications for a bipolar transistor – three figures are often seen: Beta β, hFE & hfe, each of which is slightly different.…
What is QAM: quadrature amplitude modulation QAM: Quadrature Amplitude Modulation combines amplitude & phase changes to give additional capacity & is widely used for data communications. Quadrature Amplitude Modulation, QAM utilises both amplitude and phase components to…
MELF Resistors: have your realised their advantages & used them? MELF (Metal Electrode Leadless Face) resistors stand out for their unique design and performance. They certainly seem unusual, but this hides the advantages they can bring. 🔹 What Are MELF Resistors? MELF…
Schmitt Trigger Circuit Explained The Schmitt trigger is important because this type of electronic circuit design changes its output value at a certain value, but retains this until there is a sufficient reversal of the change to return the output to its original value. The…
Show your interest in technology with this vintage vacuum tube / valve coffee mug. This stylish coffee mug features three vintage vacuum tubes or valves including an R-Type valve which was first introduced in 1916. The coffee mug is a great way of showing your intersts, or just…
CSD01060E SiC Schottky Diode The CSD01060E is a 600V 1A silicon carbide Schottky diode in a TO252 package. The diode is a surface mount device and this makes it ideal for incorporation into many small high voltage circuit designs. With all the advantages of silicon carbide…
Foldback Current LImiter Circuits Although constant current limiting circuits are very useful, they may not be adequate for all situations. When a fault occurs and drives the power supply into a condition where the maximum current is still delivered, it is likely that more…
The physicist′s greatest tool is his wastebasket. - Albert Einstein
1N5822 Schottky Diode The 1N5822 is the highest voltage rating diode in the series 1N5820 - 1N5822 series. These diodes boast a current capability of 3A which is ideal for many applications, and a maximum reverse voltage of 40V. The diode also has a guard ring incorporated into…
What is Avalanche Noise - understand the basics Avalanche noise is a form of noise that is created when avalanche breakdown occurs. It can be used for noise generators. Avalanche noise is a form of noise that does not occur in most circuit, but can be experienced with PN…
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