Author Topic: $20 LCR ESR Transistor checker project  (Read 1918686 times)

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Offline Willem52

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Re: $20 LCR ESR Transistor checker project
« Reply #4300 on: December 24, 2017, 08:23:42 am »
Please see message reply #4242

https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg1365473/#msg1365473
« Last Edit: December 24, 2017, 08:29:22 am by Willem52 »
 
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Offline dazz

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Re: $20 LCR ESR Transistor checker project
« Reply #4301 on: December 24, 2017, 09:33:15 am »
So according to the manual, inductance measurement runs for resistance values under 2K1R if I got that right.
Guitar pickups are typically above 5KR and inductance of several H's (2H, 4H etc..)

Does that mean that this device will not be capable of reading pickup inductance? Here's the one I ordered https://www.ebay.es/itm/112527481729
« Last Edit: December 24, 2017, 09:47:39 am by dazz »
 

Offline stj

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Re: $20 LCR ESR Transistor checker project
« Reply #4302 on: December 24, 2017, 10:46:04 am »
why not just play some chords on it and capture it on a pc.
then you can see the frequencys  in some audio editing software
 

Offline dazz

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Re: $20 LCR ESR Transistor checker project
« Reply #4303 on: December 24, 2017, 10:53:36 am »
why not just play some chords on it and capture it on a pc.
then you can see the frequencys  in some audio editing software

My uneducated guess is that would introduce too many factors to make the test meaningful: pickup position, string type and wear, picking technique, saddle material, tonewood... 
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4304 on: December 24, 2017, 12:42:02 pm »
So according to the manual, inductance measurement runs for resistance values under 2K1R if I got that right.
Guitar pickups are typically above 5KR and inductance of several H's (2H, 4H etc..)

Does that mean that this device will not be capable of reading pickup inductance? Here's the one I ordered https://www.ebay.es/itm/112527481729

Yep, it won't try to measure the inductance when the resistance is larger then 2k. For those kind of measurements I'd suggest to get a proper LCR meter.
 
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Offline dazz

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Re: $20 LCR ESR Transistor checker project
« Reply #4305 on: December 24, 2017, 01:09:07 pm »
So according to the manual, inductance measurement runs for resistance values under 2K1R if I got that right.
Guitar pickups are typically above 5KR and inductance of several H's (2H, 4H etc..)

Does that mean that this device will not be capable of reading pickup inductance? Here's the one I ordered https://www.ebay.es/itm/112527481729

Yep, it won't try to measure the inductance when the resistance is larger then 2k. For those kind of measurements I'd suggest to get a proper LCR meter.

Thank you madires.

How about this "sampling ADC" method described in section 3.10 of the manual?

With the samplingADC method a resonant frequency
of coils can be detected with greater inductance values. If this effect is noticeable, the frequency and
the quality factor Q of the coil is shown additionally in line 3.
The method of resonant frequency measurement can also be used for the determination of the
inductance value, if a sufficient big capacitor mith know capacity value is connected parallel to a little
inductance (<2mH). With a parallel connected capacitor the normal measurement of inductance
can no more operate well. If the resonant frequency let assume a parallel connected capacitor, the
inductance of the normal measurement is not shown and the resistance value is shown in line 1. For
this resonant circuit the quality factor Q is also computed and shown behind the frequency value in
line 3. You can identify this type of measurement with the inductance value at the first position of
line 2, followed by the text ” if ” and the value of the assumed parallel capacity. The value of this
3 10 ? 30nF (L)).
parallel capacitor can currently only be set with the calibration function (1
For displays with only two lines, the content for the third line is shown time-delayed in line 2.
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4306 on: December 25, 2017, 01:26:03 pm »
The k-firmware's sampling ADC might work. I haven't tried it with large inductance values yet.
 
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Offline dazz

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Re: $20 LCR ESR Transistor checker project
« Reply #4307 on: December 25, 2017, 02:10:28 pm »
The k-firmware's sampling ADC might work. I haven't tried it with large inductance values yet.

Great! I'll need to flash this .eep & .hex files, right?

ETA: this programmer would work? https://www.ebay.es/itm/LC-01-51-AVR-Programmer-ISP-USBASP-Downloader-USBISP-Download-Line/152706097159?hash=item238dfe2007:g:W7MAAOSwVfxZvWuz
« Last Edit: December 25, 2017, 02:32:44 pm by dazz »
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4308 on: December 25, 2017, 04:34:48 pm »
Yes & yes.
 
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Offline dazz

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Re: $20 LCR ESR Transistor checker project
« Reply #4309 on: December 25, 2017, 05:56:35 pm »
Does anybody know what firmware these T4's come with?
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4310 on: December 26, 2017, 11:50:11 am »
AFAIK, they run a modified k-firmware.
 
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Offline all_repair

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Re: $20 LCR ESR Transistor checker project
« Reply #4311 on: December 26, 2017, 12:20:55 pm »
It's really a quite beautiful case and PCB!
It's currently running firmware 1.11k and it was not locked so was possible to save it unlike most others I've seen.

I had an idea to also fit a ATtiny44 SMD PCB inside for easy programming.
It fits great but I realize a problem: it interferes with the sense resistors and thus can't be in circuit while measuring.
So now I'm thinking to find a 5v relay to drive via the USB port too, so it switches the 4 signal wires over. (MOSI, MISO, SCK & Reset)
Currently considering Panasonic S4-5V. Will see how that goes, or anyone have some better solution?

By any chance you have captured the firmware?  First time I blew one of these.  The socket clips make capacitor testing so easy.  I picked up a big capacitor from my storage to try to confirm something, and blew my set after I had it for a few days.   Too easy to use, a bit too easy to blow 😉
 

Offline Per Hansson

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Re: $20 LCR ESR Transistor checker project
« Reply #4312 on: December 28, 2017, 12:32:20 pm »
Yes of course, here you go.
Just one caveat to be aware of: it contains the calibration data from my meter.
So you should make a new calibration even though you will have no message telling you it's not calibrated....
And the fuses where set according to the picture included.
 
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Offline cvanc

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Re: $20 LCR ESR Transistor checker project
« Reply #4313 on: December 28, 2017, 04:22:56 pm »
Hi all-

I want to buy an assembled, ready to use tester, hopefully with a color screen.  Ideally I could find a source here in the U.S.  Is there a model or models that are currently considered "the good ones"?

Also, can anyone explain the difference between this 'B1' and 'B2' version?  (and... is this a decent meter in either version?)

https://www.ebay.com/itm/B1-Color-1-8-TFT-ESR-Meter-Transistor-Resistor-Diode-Triode-Capacitor-Tester/322869859401?hash=item4b2c8b1449:g:jkEAAOSwU1FaAlx0

https://www.ebay.com/itm/B2-Color-1-8-TFT-ESR-Transistor-Resistor-Diode-Capacitor-Mosfet-Tester/232448188853?hash=item361efde1b5:g:~RIAAOSweNxZkd8h

Thank you.
 

Offline rhb

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Re: $20 LCR ESR Transistor checker project
« Reply #4314 on: December 28, 2017, 04:37:50 pm »
I've not read this thread much.  As Dave noted, tl;dr.  I *am* quite interested though.

I just sent an email proposing to EEVblog that a wiki be set up where the generally useful content of threads like this can be more easily accessed.  If you think this would be a good idea, please comment here:

https://www.eevblog.com/forum/suggestions/equipment-wikis/
 

Offline mebel

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Re: $20 LCR ESR Transistor checker project
« Reply #4315 on: December 28, 2017, 07:13:31 pm »
Hello everyone

I would like to replace TL431A to TL431B to get better accuracy measurement in  "AY-AT" but I can not find TL431B. I found TL431ZCLS IK-SEMICON. Will it be good? Do I have to also  replace something else to get it worked?
Here is the reference.

https://www.maritex.com.pl/product/attachment/35707/TL431Z_03.pdf
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4316 on: December 28, 2017, 08:15:39 pm »
I want to buy an assembled, ready to use tester, hopefully with a color screen.  Ideally I could find a source here in the U.S.  Is there a model or models that are currently considered "the good ones"?

Also, can anyone explain the difference between this 'B1' and 'B2' version?  (and... is this a decent meter in either version?)

I'd go for an assembled AY-AT. The tester you've mentioned is a simple one running a modified firmware. The only difference between the the two models seems to be the color of the case.
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4317 on: December 28, 2017, 08:19:01 pm »
I would like to replace TL431A to TL431B to get better accuracy measurement in  "AY-AT" but I can not find TL431B. I found TL431ZCLS IK-SEMICON. Will it be good? Do I have to also  replace something else to get it worked?

It's a 0.5% type. You just need to replace the TL431. That's all to be done.
 
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4318 on: December 28, 2017, 08:21:50 pm »
I've not read this thread much.  As Dave noted, tl;dr.  I *am* quite interested though.

I just sent an email proposing to EEVblog that a wiki be set up where the generally useful content of threads like this can be more easily accessed.  If you think this would be a good idea, please comment here:

https://www.eevblog.com/forum/suggestions/equipment-wikis/

Jake (jakeisprobably) is working on something similar already, just for the Transistor Tester.
 

Offline stj

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Re: $20 LCR ESR Transistor checker project
« Reply #4319 on: December 28, 2017, 10:56:22 pm »
Hello everyone

I would like to replace TL431A to TL431B to get better accuracy measurement in  "AY-AT" but I can not find TL431B. I found TL431ZCLS IK-SEMICON. Will it be good? Do I have to also  replace something else to get it worked?
Here is the reference.

https://www.maritex.com.pl/product/attachment/35707/TL431Z_03.pdf


forget that, use an LM4040
 
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Offline Seabird

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Re: $20 LCR ESR Transistor checker project
« Reply #4320 on: December 29, 2017, 04:15:04 am »
I hope that I am not hijacking this thread (apologies in advance if I am)!  I have just purchased a LC-T3-H which has a very similar board layout to this schematic published earlier in this thread.  Somehow, I inadvertently got into the contrast setting and stupidly kept pressing the button in the hopes it would roll over and I would regain a readable display - Duh!  With the blank screen I now have no way of knowing what I am doing.  My questions are:  is there a 'factory reset' sequence I could use?  Are there a series of key strokes that somebody could provide to decrease the contrast setting (knowing that I would be doing this blind)?  Another thought I had was to physically wire the contrast pin of the LCD to a potentiometer to manual adjust while I get things back to normal but I am not sure which is the correct pin on the LCD?  Of course, any other suggestions that would help me get out of this dilemma will be appreciated.
 

Online indman

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Re: $20 LCR ESR Transistor checker project
« Reply #4321 on: December 29, 2017, 06:12:09 am »
Seabird
In this firmware the contrast range is regulated programmatically. It is necessary for you it is long to press the Test button, then short clicking to change contrast range. Only 10 options of level of contrast range.
 
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Offline all_repair

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Re: $20 LCR ESR Transistor checker project
« Reply #4322 on: December 29, 2017, 08:56:04 am »
It's really a quite beautiful case and PCB!
It's currently running firmware 1.11k and it was not locked so was possible to save it unlike most others I've seen.

I had an idea to also fit a ATtiny44 SMD PCB inside for easy programming.
It fits great but I realize a problem: it interferes with the sense resistors and thus can't be in circuit while measuring.
So now I'm thinking to find a 5v relay to drive via the USB port too, so it switches the 4 signal wires over. (MOSI, MISO, SCK & Reset)
Currently considering Panasonic S4-5V. Will see how that goes, or anyone have some better solution?

Thank you for your firmware.  I have recovered my set.  I tried to program in-circuit by adding header pins for the MOSI, MISO and SCK signal which sit nicely on the R18, R19 and R20 respectively.  I just tap the Vcc from J6.V, Gnd from J6.G, and reset from J6.R.  But this did not work, with or without R18, R19 and R20 in, and with the LCD ribbon out.  I am not sure what is the problem.
 

 
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Offline Seabird

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Re: $20 LCR ESR Transistor checker project
« Reply #4323 on: December 29, 2017, 10:13:49 am »
Thank you Indman.  That worked a treat.  Much appreciated as I thought I would have to buy another unit (and be more careful)!
 

Offline Per Hansson

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Re: $20 LCR ESR Transistor checker project
« Reply #4324 on: December 30, 2017, 11:43:34 am »
Thank you for your firmware.  I have recovered my set.  I tried to program in-circuit by adding header pins for the MOSI, MISO and SCK signal which sit nicely on the R18, R19 and R20 respectively.  I just tap the Vcc from J6.V, Gnd from J6.G, and reset from J6.R.  But this did not work, with or without R18, R19 and R20 in, and with the LCD ribbon out.  I am not sure what is the problem.
Strange, I did something very similar to read it out in circuit:
Cables tapped into R18, R19 & R20, I took reset at R2 closest to the Atmega, but I see you are correct that it's a direct connection to that J6-R point.
But then I used power on device: so I wired up ground to the battery ground and powered on the meter with it's own test button...

Later I also tried it with the small ATtiny44 PCB, the problem I have is that it can't be in circuit, so need to switch it out with a relay or mechanical switch.
That worked too with the caveat as described...
 


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