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Author Topic: $20 LCR ESR Transistor checker project  (Read 4046393 times)

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Offline indman

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Re: $20 LCR ESR Transistor checker project
« Reply #9525 on: July 05, 2024, 08:26:41 am »
Quote from: Phil1977 on July 05, 2024, 08:13:23 am
On the contrary, it´s good to see that the results -at least for inductivity- are not so different at all.
And if you look carefully at the photo below again, is a difference in inductance of 5-6 times normal? ;)
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Offline Phil1977

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Re: $20 LCR ESR Transistor checker project
« Reply #9526 on: July 05, 2024, 08:41:41 am »
Quote from: indman on July 05, 2024, 08:26:41 am
Quote from: Phil1977 on July 05, 2024, 08:13:23 am
On the contrary, it´s good to see that the results -at least for inductivity- are not so different at all.
And if you look carefully at the photo below again, is a difference in inductance of 5-6 times normal? ;)
Thanks, I didn't see the middle value at all.

No, a difference of 5-6 of course is noteworthy.

Just to get it right: Is this a combination of an inductor with an additional series resistor? It´s strange to have that low inductance with that high series resistance in one part.
« Last Edit: July 05, 2024, 08:49:16 am by Phil1977 »
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Offline indman

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Re: $20 LCR ESR Transistor checker project
« Reply #9527 on: July 05, 2024, 09:00:14 am »
Quote from: Phil1977 on July 05, 2024, 08:41:41 am
Just to get it right: Is this a combination of an inductor with an additional series resistor? It´s strange to have that low inductance with that high series resistance in one part.
No, the photo shows the resonant method of measuring inductance on k-firmware using a calibration capacitance connected in parallel to the coil.
On m-firmware, inductance is measured in a standard way through current pulses.
« Last Edit: July 05, 2024, 09:01:58 am by indman »
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #9528 on: July 05, 2024, 09:58:10 am »
As already mentioned multiple times, the Transistortester isn't an LCR meter. It can measure capacitance and inductance within some limits. I'll add a note to the m-firmware's documentation.
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Offline Feliciano

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Re: $20 LCR ESR Transistor checker project
« Reply #9529 on: July 10, 2024, 06:30:42 pm »
Just for fun, I threw a bilateral switch (2N4992) to my ctesters, and like the SUS I reported while back, this SBS is identified as BJT-PNP with high hFE by 1.13k, and as PUT by 1.52m.
« Last Edit: July 10, 2024, 06:34:01 pm by Feliciano »
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Offline Sardarshams

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Re: $20 LCR ESR Transistor checker project
« Reply #9530 on: July 18, 2024, 08:50:16 pm »
Hello, I need the hex file and eeprom  of this tester for version 1.52m
With 16 MHz crystal
Tester specifications
GM328A
Atmeg328p
Display
LCD TFT display XY18CG958-18B, 128 x 160 dots, ST7735S, SPI, 18 PIN, 1.8 inches for GM-328
Thank you

https://www.amazon.com/Transistor-Capacitor-Resistor-Capacitance-Automatic/dp/B09J48VN4V
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9531 on: July 21, 2024, 08:02:19 pm »
Hi!
i've been busy for day's trying to reanimate my BSide ESRPro02
It died a while ago when i accidentally zapped it with a capacitor hahaha
I've replaced the atmega328p
i'm not a programmer, so compiling etc. is a real headache for me...
After long searching & trying I managed it.
Luckily i found a compiled firmware and burned it with a usbasp cable with avrdudess
This was the only decent working firmware... At least i thought it was.
The are some issues, i shall add the pictures..
I compared the measurements with other tools and i got some weirds results

A cap from 2000uF 0.0 esr measures as 5967uF 0.0 esr
A cap from 4484uF 0.01 esr measures as 13.52mF 0.0 esr
Somehow the capacity triples at higher values
A cap from 35uF 1.48 esr measures as 36.98uF 0.0 esr
So that's kinda odd because it's not linear, and the esr isn't working also...
An resistor from 993r measures as 992.1r
An resistor from 10.01k measures as 12.2k
An resistor from 990k measures as 993.7k
Kinda weird though that 10k resistor is way off, while an 1k & 1m resistor are quite spot on
and sometimes the measurement switches between resistor & Coil?

Maybe i did something wrong? i really have no clue... hopefully someone can help me out
« Last Edit: July 21, 2024, 08:10:29 pm by Davo013 »
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #9532 on: July 21, 2024, 08:14:03 pm »
Have you set the fuse bits (low: 0xf7, high 0xd9, ext: 0xfc)?
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9533 on: July 21, 2024, 08:19:03 pm »
See attachement

but i had them like this2318255-0
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9534 on: July 21, 2024, 08:21:10 pm »
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #9535 on: July 21, 2024, 08:41:26 pm »
Please change the fuse bits to:
- low: 0xf7
- high: 0xd9
- ext: 0xfc
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9536 on: July 21, 2024, 08:46:45 pm »
I just did, but somehow no difference, i try to do some more tests
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9537 on: July 21, 2024, 08:48:34 pm »
sorry wrong one
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #9538 on: July 21, 2024, 08:52:09 pm »
Go to the window area 'Fuses & lock bits', change the values in the text boxes and click 'Write'. BTW, the main problem is that the ATmega runs with the wrong clock settings.
« Last Edit: July 21, 2024, 08:55:25 pm by madires »
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9539 on: July 21, 2024, 08:58:16 pm »
Ahhh okay....
I have written the fuses, must i burn the firmware again now?
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9540 on: July 21, 2024, 09:00:37 pm »
I'm a real noob with this stuff... lol
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #9541 on: July 21, 2024, 09:05:32 pm »
No, the firmware is already programmed.
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9542 on: July 21, 2024, 09:14:43 pm »
Still the same problems sigh...
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9543 on: July 21, 2024, 09:16:45 pm »
with large capacitors it triples the value and the esr ain't working also
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #9544 on: July 21, 2024, 09:22:39 pm »
Please read the fuse bits to verify that they are really changed.
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9545 on: July 21, 2024, 09:34:15 pm »
Weird, when i click on read, the old fuses are coming back?
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9546 on: July 21, 2024, 09:39:35 pm »
Those fuses are good, i was confused because of de capitals haha
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #9547 on: July 21, 2024, 09:41:29 pm »
Then remove the programming cable and power cycle the tester.
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Offline Davo013

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Re: $20 LCR ESR Transistor checker project
« Reply #9548 on: July 21, 2024, 09:57:38 pm »
Still the same problems sigh...
really weird,...

47uF cap no problem, 100uf stay's okay  but with 1000uF or higher the cap triples in value and no esr
with the calibration at the end you have to insert a +100nF cap as with the old firmware 1.11 but with this firmware i get this screen, i can't remember if it was like that before
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #9549 on: July 21, 2024, 10:22:00 pm »
Yep, there's another issue to solve.
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