Products > Test Equipment

TC1 lcr-meter transistor-tester fix

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bob91343:
My unit works okay but the display is bad.  It displays data as expected but the screen has become hard to read.  I can change viewing angle for some improvement but still it's bad.  It's an early monochrome.

I bought another but want to fix this one, as it seems more accurate.

shved:
If you have a mono lcd panel - that's a different model.
Most designs using those kind of displays have a contrast POT or a set of resistors witch are responsible for contrast. Check for all of those, + check for panel damage + check for corrosive flux damage.
If you indeed have a different model - give this thread a quick read and try to find threads and schematics for your specific or a similar unit.

vk3ohm:
Does anybody have a document that explains the principle of operation of these, or similar, devices? I would love to give a presentation to my radio club about how they work, but I've been unable to find any information anywhere.

ledtester:

--- Quote from: vk3ohm on December 23, 2020, 03:40:34 am ---Does anybody have a document that explains the principle of operation of these, or similar, devices? I would love to give a presentation to my radio club about how they work, but I've been unable to find any information anywhere.

--- End quote ---

The site for the project:

https://www.mikrocontroller.net/articles/AVR_Transistortester

Go to the Downloads section and get the manual in the language of your choice, e.g.:

https://github.com/svn2github/transistortester/tree/master/Doku/tags/english/ttester_eng112k.pdf

ledtester:
Should add that this is the main eevblog forum thread for these devices:

https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/

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