Light Dependent Resistor LDR or Photoresistor
Light dependent resistors, LDRs or photoresists are used to detect light. Their resistance changes significantly when they are exposed to light enabling them to be used in a variety of circuits.
Clear summaries & information about electronics, radio and connectivity
from electronics engineer, Ian Poole.
from electronics engineer, Ian Poole.
Thank you for visiting Electronics Notes. On the site I aim to provide accessible summaries, and information with a minimum of jargon covering many electronics engineering topics. All the topics are manually written by myself and the aim is to provide useful information that is easy to understand and to include many hints, tips & practical guidance notes using my experience from my many years as an electronics engineer.
Electronics Notes is written and run by Ian Poole
Active Transistor Constant Current Source
Understand the basics of what constant current sources are, the circuits used, where they are used and how to design them.
Understanding Oscilloscopes
Find out all the key points about the oscilloscope: what they are; oscilloscope types; operation; key controls . . .
Today's Selected Videos
Latest Videos
Video: Radio Antenna Theory 101
Video: Television Antennas Vintage and Modern: the future of TV antennas
I am developing a growing series of electronics infographics to explain and summaries topics on a single sheet. See more . . .
Latest Content
Programmable Logic Devices, PLDs: types and technologies:
Programmable logic devices inluding SPLDs, CPLDs and FPGAs have become a widely used part of the electronic circuit designers toolkit - find out about them.
Read more . . . . .
USB vs Bench-Top Scope:
There are some compelling arguments for using both USB oscillsocopes and bench top ones: find out which is actually the best for your situation.
Read more . . . . .
Rhombic Antenna:
Terminating the remote end of a wire antenna will result on the major lobes of radiation being directed towards the termination and those facing away are reduced.
Read more . . . . .
Cost Effective Online Training
We have partnered with some of the leading online training brands to provide some very effective online training that will keep you up to date. See more . . .
What's on ElectronicsNotes:
There is a huge variety of information on ElectronicsNotes ranging from the basic concepts through to 5G and more. Everything from electronic components, circuit designs, connectivity with everything from wired technologies like Ethernet, RS2432 and more to wireless technologies including mobile communications, Wi-Fi, IoT communications as well as radio and RF design antennas, and a host of other topics.
Find out all the information you need to know using our easily understood explanations.
Antennas & propagation
Antenna types, feeders & radio propagation
Audio-visual
Loudspeakers, microphones, HDMI, SCART, & much more
Basic concepts
Resistance, Ohm's law, capacitance to more advanced topics
Careers
Career advice, interviews, & becoming an engineer
Circuit Design
Circuits and their circuit design methodologies & details
Components
Electronic components including passive, active & ICs, etc
Connectivity
All forms of wired & wireless communications
Construction & manufacturing
Soldering (manual & automated) assembly,ESD precautions, etc
Eco / Green Engineering
Energy saving, green energy, green electronics
Radio & RF
Modulation, RF building blocks mixing, hybrids & more
Satellites
Satellites & satellite technology
Test Methods
Test equipment, technologies & test methods
Electronic engineering can make a great career providing interest, challenges and good prospects
Read more . . .
Technology history
Discover some of the stories that detail how the foundations were set in place for today's technology.
We have a large number of pages devoted to pioneers, how technology was invented and developed as well as descriptions of many types of radio receiver, etc, etc.
Racal RA17 Communications Receiver
The Racal RA17 was a high performance communications receiver introduced in 1955 and it boasted unparalleled frequency stability as a result of the use of the famous Wadley Loop.
Electronics Notes aims to provide accessible summaries about a host of electronics, radio and connectivity technologies in a practical and useful way.
Our aim is to support those who want to learn about the technology: those who are established engineers as well as students and hobbyists.
The topics included in the site range from the basic electronics concepts (useful for established engineers as well looking for those equations, formulas etc, including topics like basic electronics concepts, component descriptions and explanations, circuit designs and circuit design principals, manufacturing techniques, radio technology & RF design and wired and wireless connectivity and a host of other topics.
To fund the running of the site, we obviously need to carry advertising, but we aim to make this not too intrusive. We hope you understand, but we need to have income to meet the not inconsiderable running costs.
