Author Topic: $20 LCR ESR Transistor checker project  (Read 3396731 times)

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Offline Feliciano

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Re: $20 LCR ESR Transistor checker project
« Reply #7650 on: May 23, 2022, 07:27:01 pm »
GGMM:

The 6V8 inputs protection shouldn't be hot under normal conditions because the Vcc should be 5.0V after the voltage regulator, hence Vcc shouldn't be close to 0V unless something is in short-cirtuit (maybe the TVS and/or other protection) and/or the regulator is damaged.

As I'm not sure which specific kit you assembled, we can only guess.

BTW: on the k-firmware and indman folders there is a table of clones, so you can name yours.
« Last Edit: May 24, 2022, 12:08:06 pm by Feliciano »
 

Offline Danyit

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Re: $20 LCR ESR Transistor checker project
« Reply #7651 on: May 24, 2022, 04:54:24 pm »
Hello, please can someone help me? I am in total confusion.
I have the M328Kit+TFT, bought here with 1.13K firmware https://it.aliexpress.com/item/32675418755.html?spm=a2g0o.order_list.0.0.21ef3696r4KtrG&gatewayAdapt=glo2ita

1) I read that this kind of tester must be improved for proper working, here a link https://github.com/blurpy/transistor-tester/blob/master/resources/AY-AT-J1.3.png is it true?
I will upgrade original firmware with the 1.46m version, and here I am really confused.
2) For the reprogram, Is the arduino nano a good choose, following this guide https://www.eevblog.com/forum/testgear/lcr-t4-mtester-v2-07-lcr-meter-black-block-issue/?
3) For this firmware I have to build the firmware, or is there something ready for my hardware, where I can only change the firmware feature?
For now that's all  ;D
Please help me... Thank you...
 

Offline GGMM

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Re: $20 LCR ESR Transistor checker project
« Reply #7652 on: May 24, 2022, 04:58:30 pm »
Hello,

The regulator looks HS. I have 9v input and 6.8v output, not 5v. (Protective voltage will be active in continus , so warm), which is not normal.
 I’ve checked the entire circuit board, nothing abnormal.  No short circuit or other
I don’t have any small in stock. Only big
Well, I could do the test with a bigger one with a test connection.
To be see

cdt

 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7653 on: May 24, 2022, 05:54:39 pm »
1) I read that this kind of tester must be improved for proper working, here a link https://github.com/blurpy/transistor-tester/blob/master/resources/AY-AT-J1.3.png is it true?

It can be improved, but you don't have to if you're happy with your clone as it is.

2) For the reprogram, Is the arduino nano a good choose, following this guide https://www.eevblog.com/forum/testgear/lcr-t4-mtester-v2-07-lcr-meter-black-block-issue/?

Any AVR ISP programmer is fine, e.g. an Arduino with the ISP scetch or an inexpensive USBASP clone.

3) For this firmware I have to build the firmware, or is there something ready for my hardware, where I can only change the firmware feature?

Use the settings listed in the Clones file as starting point.
 
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7654 on: May 24, 2022, 05:56:08 pm »
The regulator looks HS. I have 9v input and 6.8v output, not 5v. (Protective voltage will be active in continus , so warm), which is not normal.

Is the 5V regulator shot?
 
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Offline Danyit

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Re: $20 LCR ESR Transistor checker project
« Reply #7655 on: May 25, 2022, 07:57:58 am »
@madires Thank you...
2) Ok so I can follow the linked guide, paying attention to the arduino nano pinout. In the section # avrdude: ISP programmer, port and options in Makefile, I have to choose # Arduino as ISP, is it true?
3) Where is Clone file? Do you mean page 67 of the user manual?
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7656 on: May 25, 2022, 09:20:40 am »
2) Ok so I can follow the linked guide, paying attention to the arduino nano pinout. In the section # avrdude: ISP programmer, port and options in Makefile, I have to choose # Arduino as ISP, is it true?

Yep!

3) Where is Clone file? Do you mean page 67 of the user manual?

The Clones file is in the m-firmware's source archive (ComponentTester-1.46m.tgz). The manual you've mentioned includes a copy of the Clones file.
 
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Offline mclute0

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Re: $20 LCR ESR Transistor checker project
« Reply #7657 on: May 26, 2022, 09:44:52 pm »
Has anyone tried one of these round testers with the two USB ports?

https://www.aliexpress.com/item/3256803630829124.html

I think a USB power supply might be better than some of the regulators in the Chinese versions. I blew up my first one using a 12v wall wart.
 
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Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7658 on: May 27, 2022, 11:46:40 am »
IIRC, we need to add support for the 74HC164 serial shift register to the semi-ST7735 driver for that new GM328A variant. It comes with an MCU emulating an ST7735 with reversed color order (BGR instead of RGB). Any circuit diagram already available?
 

Offline lhlad

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Re: $20 LCR ESR Transistor checker project
« Reply #7659 on: May 28, 2022, 01:02:19 pm »
Some more background info on the symbol sizes in the m-firmware ;) At the moment there are two bitmap sets, 24x24 (horizontal & vertical bit orders) and 32x32 (horizontal only). As larger the symbols as larger the firmware. Based on the display controller you have to select a bitmap with a specific bit order. ILI9341 and ST7735 need horizontal order, and ST7565 is page-wise vertical. For ILI9341 and ST7735 you can change SYMBOL_RESIZE in the driver source file to resize the symbols by that factor. I've choosen the defaults to match the display size. For the ST7735 you can choose between SYMBOLS_24X24_H (default) and SYMBOLS_32X32_H in the config_328.h and change the sizing factor (default: 2) via SYMBOL_RESIZE in ST7735.c.

In case someone likes to draw some nicer symbols, I've written a tool to convert the bitmaps from and to different bit orders, including page-wise grouping.

Hi Madires

Is the tool you mention in the above available anywhere?

Cheers
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7660 on: May 28, 2022, 03:42:20 pm »
Not publicly. Please send me an email.
 

Offline GGMM

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Re: $20 LCR ESR Transistor checker project
« Reply #7661 on: May 28, 2022, 03:57:59 pm »
Hello Madires

I have changed the 7550 regulator by a 78L05.
It's work well now

Watch out for connections that are differenst  for these 2 regulators, but it’s functional.
cdt
 

Offline Danyit

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Re: $20 LCR ESR Transistor checker project
« Reply #7662 on: May 30, 2022, 09:19:24 am »
@madires I hope that I only have last request. If I want use pl-2303 usb to serial programmer, what avrdude: ISP programmer I have to choose in the makefile? And please what software did you recommend to put this 2 files into transitor checker?
Thank you very much for you help and time...
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7663 on: May 30, 2022, 10:48:07 am »
Haven't tried programming the ATmega with a PL-2303 yet. Maybe this helps: http://nerdralph.blogspot.com/2014/05/pl-2303hx-bit-bang-avr-programmer.html.
 

Offline Yuriy_K

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Re: $20 LCR ESR Transistor checker project
« Reply #7664 on: June 05, 2022, 01:04:27 pm »
Hello Madires.
How do you feel about this idea. Add a vertical diode symbol to the font and display this symbol as shown in the photo. It would be easier if all component symbols were displayed in a fixed location (no vertical shifts). I've just started to redo it, it takes more time. Do not pay attention to my colors, I did it for myself.
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7665 on: June 05, 2022, 03:48:11 pm »
That's a nice idea! Since indman is working on alternative symbol sets I'd suggest to wait until he has finished the symbol sets (some already include the MOSFET's body diode) before implementing your idea.
 

Offline indman

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Re: $20 LCR ESR Transistor checker project
« Reply #7666 on: June 05, 2022, 06:05:48 pm »
Displaying the parasite diode(body) symbol as an additional diode is already used in k-firmware. But since a MOSFET include has such a diode in its structure, it is reasonable to represent it initially in the symbol. This is what the picture will look like with the alternative symbols set and the location alternative of the numeric contact numbers. This will make it much easier to read the display information. ;)
« Last Edit: June 05, 2022, 07:03:48 pm by indman »
 

Offline Yuriy_K

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Re: $20 LCR ESR Transistor checker project
« Reply #7667 on: June 06, 2022, 02:50:08 am »
That's a nice idea!
This is not an idea, but a variant of incomplete implementation. The photo shows from my display. Only arrows from Photoshop, corrected all the required places. Now everything turned out as planned to the best of my abilities.

With great changes, I managed to get the second option. In my opinion, it is more acceptable.
« Last Edit: June 08, 2022, 02:10:38 pm by Yuriy_K »
 

Offline b0hoon

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Re: $20 LCR ESR Transistor checker project
« Reply #7668 on: June 07, 2022, 10:15:25 pm »
Hi.

I attach corrected fonts from firmware 1.46m:

font_6x8_iso8859-2_hf -> lack of cathode line in the first diode symbol, fixed badly encoded "W" letter (0x44 -> 0x14)
font_8x8_iso8859-2_h -> fixed index of "\" in index table (0x4b -> 0x4c)
font_10x16_hf -> lack of data for ")" symbol (it's 0x19), fonts are useless without it, cause it shifts the data in relation to index table

Additionally i attach fonts converted with my tool from font_8x12t_iso8859-2_vfp and font_8x16_iso8859-2_vfp to hf format, which are for me very usefull for GM328(A) testers.


 
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Offline ifonlyeverything

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Re: $20 LCR ESR Transistor checker project
« Reply #7669 on: June 10, 2022, 02:39:45 am »
Before I potentially waste money, can logic analyzer style probes be used on this meter without messing up accuracy too badly? Something like https://www.ebay.com/itm/374089380526 I want to be able to use test inductors and oddly shaped capacitors without twisting and contorting the leads.

edit: This may be helpful for anyone else in a similar position. https://sigrok.org/wiki/Probe_comparison
« Last Edit: June 10, 2022, 12:26:52 pm by ifonlyeverything »
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7670 on: June 10, 2022, 10:00:48 am »
Yes! But the cheap Chinese ones usually have a poor contact and the wires break off easily.
 
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Offline Per Hansson

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Re: $20 LCR ESR Transistor checker project
« Reply #7671 on: June 11, 2022, 07:32:48 am »
As you are on the topic of graphics here I'll ask:
In the M-firmware the acronym Ube is used for transistors Vbe voltage.
It is a German acronym, anyone knows if it is by design or an oversight?
 

Offline indman

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Re: $20 LCR ESR Transistor checker project
« Reply #7672 on: June 11, 2022, 07:45:15 am »
Your photo shows k-firmware. The m-firmware uses the designation Vbe. There is nothing stopping you from changing the parameter designation in k-firmware to one that suits you best. :)
 

Offline Per Hansson

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Re: $20 LCR ESR Transistor checker project
« Reply #7673 on: June 11, 2022, 07:52:29 am »
Yes sorry that was a typo, I'm aware I'm using the k-firmware, and hence the logic use of the acronym Ube since it is written by Karl-Heinz Kübbeler in Germany :)
I was just curious if others noticed this and thought it was an oversight or not... :)
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #7674 on: June 11, 2022, 09:34:32 am »
Easy to change in Transistortester.h:
Code: [Select]
const unsigned char Ube_str[] MEM_TEXT = "Ube=";
 
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