REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday 27 February 2019

DIFFERENCE BETWEEN LED AND LASER DIODES

Difference between LED and Laser Diodes

LED and Laser Diodes are key components in many application such as optical wireless communication. The key difference between LED and Laser Diodes are:

1. LED produces Incoherent light via spontaneous emission, whereas Laser Diodes can produce coherent light via stimulated emission. (coherent means that the energy, frequency and phase are same for all photons that are emitted)

2. The output power from a LED is linear with the drive current, whereas for Laser Diodes the output power becomes linear with drive current only after some some threshold is surpassed.

3. Both can be made by same compounds but the difference is the structure of the device. Laser Diodes are produced with special structure that permits it to produce coherent light with small spectral optical bandwidth.

4. The optical spectral width of Laser Diodes(0.1nm to 5nm) are smaller than the LED(25nm to 100nm).

5. Laser Diodes operates faster than the LED. Laser Diodes can operate in the GHz range whereas LED operates in the MHz range.

6. Laser Diodes are more vulnerable and sensitive to temperature than LED

7. Laser Diodes are more expensive than LED

8. Laser Diodes requires external additional threshold and temperature compensation circuitry.

9. LED are more reliable than Laser Diodes

10. LED is eye safe whereas Laser Diodes can affect eye depending upon the frequency of operation