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ardhuru
- 6th December 2014, 09:02
Here's something I picked off ebay;

This guy can test most 2 / 3 lead components (transistors,triacs,thyristors,diodes, LEDs, resistors, caps...) AND identify their leads as well.

7499

It helped me weed out all the bad mosfets I had in my junkbox, and identify the generic type of devices on which the markings had got erased.

Thought it would be useful to folks on the forum.

Regards,

Anand

Demon
- 6th December 2014, 15:49
Moved to FAQ and stickied cause this is a gem.

Robert

ardhuru
- 6th December 2014, 16:07
Thanks, Robert.

I was so impressed with this gadget I did some research, and found that this is based on an original design out in the public domain. The basic version has *very* simple hardware, Unfortunately, based on the *other* family of micros.

For anybody wanting to roll their own: http://translate.google.com/translate?depth=1&hl=en&prev=/search%3Fq%3Dtransistor%2Btriac%2Btester%2Bmarkus% 26client%3Dfirefox-a%26hs%3D4DK%26rls%3Dorg.mozilla:en-US:official%26channel%3Dsb&rurl=translate.google.co.in&sl=de&u=http://www.keinschnickschnack.de/%3Fpage_id%3D148

Regards,

Anand

Archangel
- 7th December 2014, 07:56
Hi Anand,
Well, you just sold one to me, I also just ordered an ESR tester a couple of days ago, had never really seen one before, seems it is for all practical purposes an A/C ohm meter, as it tests capacitors at 100kc. I will review it when the kit comes.
BTW, this tester you showed us is MUCH cheaper than the esr tester.

EDIT: 12/10/2014
This is the esr meter , I bought the kit:
http://www.mainelectronics.com/esrkit.htm

I assembled it last night . . . Works Great !

ardhuru
- 7th December 2014, 08:55
Glad!

Further probing reveals that the original design was by a guy called Marcus. Later, his design was improved upon by Karl, and he's keeping on adding features to it (including ESR, I think). The Chinese stuff on Ebay is pretty much based on that.

I put together a basic, minimalistic version of the original for a pal (minus the auto-switch off circuitry and the LCD, the data displayed on the LCD is also given out on the UART, can be monitored on the PC).

Acetronics2
- 7th December 2014, 21:44
got it ...

http://www.ebay.ca/itm/Mega328-Transistor-Tester-Diode-Triode-Capacitance-ESR-Meter-MOS-PNP-NPN-L-C-R-/171301738120?pt=LH_DefaultDomain_0&hash=item27e2611688

Alain

Archangel
- 8th December 2014, 06:05
got it ...

http://www.ebay.ca/itm/Mega328-Transistor-Tester-Diode-Triode-Capacitance-ESR-Meter-MOS-PNP-NPN-L-C-R-/171301738120?pt=LH_DefaultDomain_0&hash=item27e2611688

Alain
This seller is cheaper, no bidding: http://www.ebay.com/itm/271611840945?_trksid=p2060778.m2749.l2649

Acetronics2
- 8th December 2014, 09:19
Halas ...


Unfortunately, access to this particular item has been blocked due to legal restrictions in some countries

no joy ...

ardhuru
- 8th December 2014, 14:48
no joy ...

Not to worry. If you'd like to build one (a very basic version with text LCD), I can send you the firmware files. I programmed the ATMEGA8 using just a parallel cable and 4 resistors. In fact, you dont even need the LCD, you can connect it to a PC over a serial port.

Regards,

Anand

Acetronics2
- 8th December 2014, 17:20
Hi, Anand

Mine is on the way home ( from the link I gave ) ... but it ( no joy ) is not available for me from the Ebay page Archangel gave.

Alain

Archangel
- 8th December 2014, 20:11
Hi, Anand

... but it ( no joy ) is not available for me from the Ebay page Archangel gave.

Alain
Those Dogs !

Demon
- 8th December 2014, 22:06
That 2nd listing has contradictory information; main page says Ships USA Only, but description has a few countries listed under Shipping - including France.

Maybe you have to contact seller to get approval.

Robert

Acetronics2
- 9th December 2014, 09:43
Hi, Robert ...

No hope !!! I only get this red screen :
http://www.ebay.com/itm/Error?item=271611840945&errid=17

note it's somewhat "rock'n Roll" : I ordred once a MS 5262A wind meter from china : no Problem to order. Few minutes later I tried to re-open the Ebay page : Red Screen !!!

I received my meter 2 weeks later ...

Alain

pedja089
- 9th December 2014, 11:30
You can use Tor browser (https://www.torproject.org/projects/torbrowser.html.en) to avoid country restriction. I used for youtube. Because lot of videos were restricted to Serbia, few years ago.

peterdeco1
- 9th December 2014, 18:40
Hi Everyone. There are a ton of them here. Search mega328 component tester
http://www.aliexpress.com

Acetronics2
- 9th December 2014, 20:45
alixpress devices are cheap, but .... what about postage ??? :rolleyes:

Alain

peterdeco1
- 10th December 2014, 19:43
Hi Alain. Some offer free shipping by mail (usually takes 3 weeks to get here in the U.S.) some have reasonable shipping charges, and some charge WAY too much. Click on the item for shipping details.

peterdeco1
- 10th December 2014, 20:04
I just found you will get many more matches if you search mega328 tester.