Recently one of my news letter subscribers wrote me looking for some information on testing BJTs, so I thought this would be a good topic for the Blog. Here are 2 links to some good information on testing a BJT , click here for link 1 and click here for link 2 you can also click on the photo below.
Don't forget to sign up for our FREE monthly electronics news letter, if you have not already signed up do it now by clicking here. Every month Preher TV will send out a news letter packed with electronics information and August's news letter will also be the release of my new book on electronics repair including LCD TV repair. Don't miss out, again if you are not a subscriber start today by clicking here or by clicking the photo below.
The third part on making electrical measurements. Click here to read part 3. These three articles just touch the surface, to learn much more about making measurements and testing electronic components you must read a good book on the subject, like "Testing Electronic Components" or "Electronic And Electrical Servicing", these are great books and by reading them not only will you have gained great amounts of knowledge but you will also have completed the first 2 necessary steps towards getting a CETG apprentice certification.
Second part of Making electrical measurements.Click here to read more.
Here is part one of a good article for taking electrical measurements, this is something you should feel very comfortable doing if you want to be an electronics repair technician, if you want to feel comfortable it is essential you know what you are doing..Click here to read more.
Beware of blue star international components, I have used them in the past with no problems, but I usually don't because they are over priced. This time I made an order because my normal distributor did not have the part I needed in stock and I needed it fast. Well guess what? These guys sent me a used refurbished convergence IC, it looked like it was pulled from a junk pile!!! it had rust on the back even!!! And guess what, it didn't work, I had to order another one from some where else to fix this customers set, and refund the customer the express shipping on that used part.I have emailed blue star international components asking them how they will resolve this and why they would send me this horrible used part when I was purchasing a new one, they have failed to respond and chose to ignore me. Oh well my business will never use this horrible company again, and I urge any of you that use this company to be aware they are using bad and illegal business practices. Be careful of anywhere you buy parts and stick with your trusted distributors.
Don't use these guys they do bad business, BEWARE!!!!
http://www.bluestar-online.com/
(Edit 7/30/09)
Well I have to say that although I have never received a response from Bluestar , I did notice today that they refunded me the money for the IC, when checking my bank account. I'm glad they refunded my money but it really does not excuse selling that "rebuilt" STK393-110.
Here is the Schematic and the parts list for the "Astable DJ" circuit featured on our project page recently.Visit the project page by clicking the photo below.
Here is our latest recycling project, using broken electronic devices from around the shop.This is a simple astable mutivibrator using variable resistors for an adjustable time constant.The parts list and schematic will be available soon on our project page, click here to visit the project page.Enjoy the video clip.
