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Author Topic: $20 LCR ESR Transistor checker project  (Read 3438867 times)

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Offline Hydrawerk

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Re: $20 LCR ESR Transistor checker project
« Reply #450 on: June 03, 2014, 05:02:46 pm »
Yes, the latest firmware brings a special function in menu.
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Offline intrax

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Re: $20 LCR ESR Transistor checker project
« Reply #451 on: June 03, 2014, 06:10:04 pm »
Quote from: Hydrawerk on June 03, 2014, 05:02:46 pm
Yes, the latest firmware brings a special function in menu.
Probably only working on atmega328… any link to a suitable model on ebay?  Thanks.
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #452 on: June 03, 2014, 06:14:59 pm »
Quote from: intrax on June 03, 2014, 06:10:04 pm
Quote from: Hydrawerk on June 03, 2014, 05:02:46 pm
Yes, the latest firmware brings a special function in menu.
Probably only working on atmega328… any link to a suitable model on ebay?  Thanks.

Yep! Take any clone with an ATmega328 and flash the latest firmware. Both firmware branches (k and m) support in circuit capacitance and ESR checks.
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Offline intrax

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Re: $20 LCR ESR Transistor checker project
« Reply #453 on: June 03, 2014, 06:19:48 pm »
Quote from: madires on June 03, 2014, 06:14:59 pm
Quote from: intrax on June 03, 2014, 06:10:04 pm
Quote from: Hydrawerk on June 03, 2014, 05:02:46 pm
Yes, the latest firmware brings a special function in menu.
Probably only working on atmega328… any link to a suitable model on ebay?  Thanks.

Yep! Take any clone with an ATmega328 and flash the latest firmware. Both firmware branches (k and m) support in circuit capacitance and ESR checks.
Any ? I do like the graphics display's… ;D
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Offline robimarko

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Re: $20 LCR ESR Transistor checker project
« Reply #454 on: June 03, 2014, 08:27:50 pm »
I am looking to buy this one:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=281314227233&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

I need esr and capacitance measurment really often and i dont have money for a standard meter.

Can that version be updated with latest firmware?
And can you link some versions of firmware?
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #455 on: June 03, 2014, 08:31:11 pm »
Quote from: intrax on June 03, 2014, 06:19:48 pm
Any ? I do like the graphics display's… ;D

The Wumpus will get you  ;)
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Offline neslekkim

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Re: $20 LCR ESR Transistor checker project
« Reply #456 on: June 03, 2014, 08:34:09 pm »
Quote from: robimarko on June 03, 2014, 08:27:50 pm
I am looking to buy this one:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=281314227233&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

I need esr and capacitance measurment really often and i dont have money for a standard meter.

Can that version be updated with latest firmware?
And can you link some versions of firmware?

I guess you should ask the seller for the firmware source before buying those versions.. and find out if the icsp port is available for firmware uploads. ( I have newer found better pictures of these, showing the backside etc)
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Offline eevbstedt

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Re: $20 LCR ESR Transistor checker project
« Reply #457 on: June 03, 2014, 08:50:33 pm »
Quote from: robimarko on June 03, 2014, 08:27:50 pm
I am looking to buy this one:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=281314227233
The description reminds me of the last one I bought. 

'Latest Firmware' they said.
'What version is that?', I asked.
'The latest!', they said.

Turns out their definition of latest is 1.07k.  =/
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Offline robimarko

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Re: $20 LCR ESR Transistor checker project
« Reply #458 on: June 03, 2014, 08:59:28 pm »
That version is just an example,i sent a message to seller.
But most likely i will have to buy standard socketed 328 version with 16x02 lcd

Somebody got a recommendation?
« Last Edit: June 03, 2014, 09:03:38 pm by robimarko »
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #459 on: June 03, 2014, 09:36:37 pm »
Quote from: robimarko on June 03, 2014, 08:27:50 pm
I am looking to buy this one:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=281314227233&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

I need esr and capacitance measurment really often and i dont have money for a standard meter.

Can that version be updated with latest firmware?

That clone uses a graphics LCD which requires some custom firmware modifications.

Quote
And can you link some versions of firmware?

The latest and greatest is available at http://www.mikrocontroller.net/svnbrowser/transistortester/Software/ ('trunk' for the k-firmware and 'Markus' for the m-firmware).
« Last Edit: June 03, 2014, 09:38:30 pm by madires »
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Offline AintBigAintClever

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Re: $20 LCR ESR Transistor checker project
« Reply #460 on: June 03, 2014, 10:15:23 pm »
I bought http://www.ebay.com/itm/190949271460 which came with 1.10k firmware and the extra menus.

Main IC is a socketed 328.
« Last Edit: June 03, 2014, 10:21:38 pm by AintBigAintClever »
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Offline neslekkim

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Re: $20 LCR ESR Transistor checker project
« Reply #461 on: June 03, 2014, 10:27:54 pm »
did you take some pictures of its inside?
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Offline robimarko

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Re: $20 LCR ESR Transistor checker project
« Reply #462 on: June 04, 2014, 07:12:03 am »
Quote from: AintBigAintClever on June 03, 2014, 10:15:23 pm
I bought http://www.ebay.com/itm/190949271460 which came with 1.10k firmware and the extra menus.

Main IC is a socketed 328.

And off course seller does not send it to Croatia
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Offline AintBigAintClever

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Re: $20 LCR ESR Transistor checker project
« Reply #463 on: June 04, 2014, 10:36:30 pm »
Try this one, then. Looks identical, my guess is that the insides will be, too. Croatia not on the postal exclusions this time.
www.ebay.com/itm/181109931348

Pictures of the inside of mine attached.

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Offline neslekkim

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Re: $20 LCR ESR Transistor checker project
« Reply #464 on: June 05, 2014, 07:39:14 am »
looks good.. Strange that nobody adds the programming headers :(
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Offline AintBigAintClever

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Re: $20 LCR ESR Transistor checker project
« Reply #465 on: June 05, 2014, 10:41:45 am »
Keeps the cost down I suppose. Why spend a few pence on a header when you can just NOT do it instead? Besides, if the IC is socketed it can be removed for programming.
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Offline neslekkim

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Re: $20 LCR ESR Transistor checker project
« Reply #466 on: June 05, 2014, 10:44:19 am »
the header I can solder myself, but the pinout.. holes.. are those really expensive ? :)
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #467 on: June 05, 2014, 11:11:09 am »
Quote from: AintBigAintClever on June 04, 2014, 10:36:30 pm
Try this one, then. Looks identical, my guess is that the insides will be, too. Croatia not on the postal exclusions this time.
www.ebay.com/itm/181109931348

Pictures of the inside of mine attached.

The cap for buffering AREF is missing (C1 in your case). By adding a 1nF ceramic cap you could stabilize the reference voltage of the ADC.
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Offline intrax

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Re: $20 LCR ESR Transistor checker project
« Reply #468 on: June 05, 2014, 05:09:55 pm »
Quote from: neslekkim on June 05, 2014, 10:44:19 am
the header I can solder myself, but the pinout.. holes.. are those really expensive ? :)
Any links to a version including header?  O0
I have not seen one,  which one is best for in circuit testing ?
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Offline retrolefty

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Re: $20 LCR ESR Transistor checker project
« Reply #469 on: June 05, 2014, 06:07:49 pm »
Quote from: intrax on June 05, 2014, 05:09:55 pm
Quote from: neslekkim on June 05, 2014, 10:44:19 am
the header I can solder myself, but the pinout.. holes.. are those really expensive ? :)
Any links to a version including header?  O0
I have not seen one,  which one is best for in circuit testing ?

 One problem attempting to use any ICSP is that the chip has external components wired to pins (I don't yet have a schematic so others would have to check for you) so they may very well interfere with the external programmer operation.

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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #470 on: June 05, 2014, 08:45:30 pm »
Quote from: intrax on June 05, 2014, 05:09:55 pm
Quote from: neslekkim on June 05, 2014, 10:44:19 am
the header I can solder myself, but the pinout.. holes.. are those really expensive ? :)
Any links to a version including header?  O0
I have not seen one,  which one is best for in circuit testing ?

Most clones without an enclosure got the pads for the ISP header (hidden below the LCD module).
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #471 on: June 05, 2014, 08:50:11 pm »
Quote from: retrolefty on June 05, 2014, 06:07:49 pm
One problem attempting to use any ICSP is that the chip has external components wired to pins (I don't yet have a schematic so others would have to check for you) so they may very well interfere with the external programmer operation.

No worries, it's designed to work fine.
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Offline Hydrawerk

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Re: $20 LCR ESR Transistor checker project
« Reply #472 on: June 06, 2014, 09:52:26 pm »
My component tester is almost finished so I made a video. The front panel is under construction.

Well, there are many such videos on youtube. Nothing new really.
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Offline robimarko

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Re: $20 LCR ESR Transistor checker project
« Reply #473 on: June 07, 2014, 04:05:30 pm »
At end i bought this one
http://www.ebay.com/itm/281206556098?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

It has socketed DIP Atmega328 so even if it has old firmware revision i can flash it to latest with my arduino
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Offline eevbstedt

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Re: $20 LCR ESR Transistor checker project
« Reply #474 on: June 08, 2014, 01:50:56 pm »
Quote from: robimarko on June 07, 2014, 04:05:30 pm
At end i bought this one
http://www.ebay.com/itm/281206556098?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
That looks the same at the last one I got but is a different seller.  Ask them what version of firmware it comes with.  :)
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