The Edsion Filament lamp may be less popular, but it is the most cost-effective light even today. It is very affordable, The light is soothing to the eyes and best of all gives a warm feeling.
Sometimes due to the mains being restored when bulb is on, or a rapid flick of switch, blows it. This may be due to the cold filament resistance which is low, allowing a huge inrush current.
The problem can be solved with a soft start based on thyristor or mosfet using PWM etc. The circuit here is a low cost solution which may help a bit in reducing the inrush cold current Protection from long duration high voltages is also required but will make circuit more complex.
Now why would anyone spend for a R-C network for a bulb, you could as well buy a new bulb. But I once got a back sprain while replacing a bulb in a hurry, So the price of the bulb alone is not the issue.
The two diodes 1A form a AC path with a switching delay of diodes, The R-C network is for soft start. The Varistor-Thermistor has a cold resistance 4.7E which reduces as it warms up. If switch is flicked rapidly or power fluctuates, then varistor cannot help as its response is slow. The 10E resistor ceramic fusible wirewound resistor and C1 does the job of absorbing .
This circuit has not been tested for long times at multiple places, so i am not sure of its performance.
Many pages, illustrations and Interactive demonstrations in Electronics. A new section on AC electronics, designed to teach the basics of AC Theory in 10 easy to learn modules. Individual topics too like capacitors, inductors, reactance, impedance, etc.
Learn About Electronics – Eric Coates
The Step-by-Step Lessons in Electricity and Magnetism is very simple and full of nice Explaining Pictures. This will work up your appetite to learn more about the Physics and Chemistry in Electronics.
- Section 3.1 Electromagnetic Induction.
- In section 2.1 Capacitors.
Eric Coates has 26 year practical career in electronics, and 17 years as a lecturer in vocational colleges in the UK.
Simulation and modelling software, designed specifically for students to learn the basics of Electricity and Science.
Yenka Interactive Software for Learning
For maths they have a software for 3D mathematical models. Colorful virtual labs help in studying Science lessons.
In Electronics you can test out your electronic projects, even PIC or PICAXE programs, 3D PCB layouts too.
Yenka Technology is a complete simulator for design and technology.
Design and test analogue and digital electronic circuits, convert them to PCB layouts, and program PIC or PICAXE microcontrollers.
Here are some Training Boards with Teaching Software for electrical engineering and electronics. They also cover Mechatronic systems, Automation and Embedded Electronics.
hps SystemTechnik – didactic concepts
These are useful for vocational training, academic education and Introduction for Beginners. The PC is required for this Training Material and Boards.
Typ 3851 PIC Controller Board
Universal training system for microcontroller technology, Usually with varying PIC Controllers (16F84A, 16F876A,…), Programming in Assembler, only 35 commands necessaryCommunication with an PC over RS 232 interface, optional over USB interface
These are based on Practical Learning or “Didactic concepts” which means – Experiential learning, that expands to things like Factory or Field Visits, Build with Kits and Boards, Hands on Workshop sessions, Environment of the Science or Technology recreated or simulated in Interactive 3D. Objects, samples and Material that the learner can apply his senses on and perceive. Real Life Project or Problem he can tackle by applying his skills.
The best is of course, Apprentice Learning which has been there for centuries. In the ancient days if the father was a Blacksmith, the son would inherit his skills and job. This was because of unconscious Didactic Training the father gave to the son.