Author Topic: $20 LCR ESR Transistor checker project  (Read 3373433 times)

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Offline Argiros

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Re: $20 LCR ESR Transistor checker project
« Reply #4375 on: January 18, 2018, 03:10:31 pm »
Thank you madires !  Yes thats an ST7735. Sorry mate but I dont understand "So you would have to reverse engineer the pinout and configure the firmware accordingly"
If you can explain it a bit more...

I can restore it to "factory" settings because I saved: 1 the original flash , 2 the eeprom and 3 the fuse settings , IF I can delete it or "put" the chip in programming mode.

BUT HOW ?
 

Offline perieanuo

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Re: $20 LCR ESR Transistor checker project
« Reply #4376 on: January 18, 2018, 04:48:26 pm »
Thank you madires !  Yes thats an ST7735. Sorry mate but I dont understand "So you would have to reverse engineer the pinout and configure the firmware accordingly"
If you can explain it a bit more...

I can restore it to "factory" settings because I saved: 1 the original flash , 2 the eeprom and 3 the fuse settings , IF I can delete it or "put" the chip in programming mode.

BUT HOW ?
If you put wrong fuses maybe you need to rewrite chip with parallel programmer.

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Offline Technobabble_

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Re: $20 LCR ESR Transistor checker project
« Reply #4377 on: January 18, 2018, 08:47:08 pm »
Hey all. Did anybody ever compile a list comparing the different versions of kits (barebones vs completed, smd vs through-hole models, etc.)? I understand each vendor may have its own part-of-the-week in theirs.

Thanks.
 
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Offline Argiros

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Re: $20 LCR ESR Transistor checker project
« Reply #4378 on: January 19, 2018, 12:51:27 am »
Thanx perieanuo !
I can hook up directly to ATMEGA 328 OR to the board ISP interface from an LPT port ? And I can use the avrdude or avrdudes then  ? Or I can use the USBASP USBISP AVR Programmer better ?

« Last Edit: January 19, 2018, 01:10:26 am by Argiros »
 

Offline texaspyro

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Re: $20 LCR ESR Transistor checker project
« Reply #4379 on: January 19, 2018, 12:53:36 am »
Or just spend a couple of bucks for a new AVR chip...
 

Offline Argiros

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Re: $20 LCR ESR Transistor checker project
« Reply #4380 on: January 19, 2018, 01:08:32 am »
I will make it work even if I desolder the smd ATMEGA 328 with my hot air gun, put it on a breadboard and reprogram it with arduino or whatever. I want this sh.t to work although I ordered a new rotary one 328A.
But I dont know how to make his flash and eeprom and what fuses I must use for the 328b. I dont know what constants I must change before compiling the source. Maybe someone make a precompile hex for the 328b models. (-;
 

Offline Fumio

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Re: $20 LCR ESR Transistor checker project
« Reply #4381 on: January 19, 2018, 04:18:48 am »
T3 s9014 is likely bad. Mine was bad and gave same symptom as you state. To check: before you start to unsolder the existing transistor run a ground from negative side of RED LED to ground. Doing this will create the ground that T3 should provide
Hope this is helpful
Fumio
 

Offline perieanuo

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Re: $20 LCR ESR Transistor checker project
« Reply #4382 on: January 19, 2018, 07:18:19 am »
I will make it work even if I desolder the smd ATMEGA 328 with my hot air gun, put it on a breadboard and reprogram it with arduino or whatever. I want this sh.t to work although I ordered a new rotary one 328A.
But I dont know how to make his flash and eeprom and what fuses I must use for the 328b. I dont know what constants I must change before compiling the source. Maybe someone make a precompile hex for the 328b models. (-;
Search I posted myself compiled 1.28 hex/eep for ay-at longtime ago.

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Offline Gregi

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Re: $20 LCR ESR Transistor checker project
« Reply #4383 on: January 19, 2018, 10:42:04 am »
Hi guys, this is my first post here. Maybe a dumb question and maybe not. I want to buy one of those testers. Can you please give me some advice of which one is the best you can get today. What I mean is which one can be modded upgraded or whatever. I am kinda lost in these 170+ pages. I have seen that some of you ppl already made some modifications but I am lost anyway  :wtf:

So which one is the newest and what to look out for?
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4384 on: January 19, 2018, 11:26:39 am »
The AY-AT is the most interesting clone at the moment. If you want a tester with all hardware options you would have to build one yourself based on the ATmega644/1284 circuit.
 

Offline Gregi

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Re: $20 LCR ESR Transistor checker project
« Reply #4385 on: January 19, 2018, 01:41:49 pm »
Great... Ty for quick answer. Btw anyone made atmega644/1284 based tester and if so does the firmware exist or I should start from scratch?
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4386 on: January 19, 2018, 03:10:35 pm »
Karl-Heinz's excellent documentation includes a circuit for the ATmega644/1284 and I've posted a PDF of my 644/1284 dev kit a while ago. Both firmwares (k & m) support the ATmega644/1284.
 

Offline texaspyro

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Re: $20 LCR ESR Transistor checker project
« Reply #4387 on: January 19, 2018, 06:07:20 pm »
Karl-Heinz's excellent documentation includes a circuit for the ATmega644/1284 and I've posted a PDF of my 644/1284 dev kit a while ago. Both firmwares (k & m) support the ATmega644/1284.

Has anybody made any PCBs or a layout for a 644/1284 version available ?  I have a bunch of 1284 chips.
 

Offline madires

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Offline texaspyro

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Re: $20 LCR ESR Transistor checker project
« Reply #4389 on: January 19, 2018, 06:31:44 pm »
Please see https://drive.google.com/drive/folders/0B4yqyYy2DaakZzBVU3JDSXB6S1E ;)

I did a little poking around there and did not see any layouts for a '1284 based board.  What I'd like to find is a PCB for the '1284 chip in a DIP package.
 

Offline Gregi

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Re: $20 LCR ESR Transistor checker project
« Reply #4390 on: January 19, 2018, 09:55:41 pm »
What else you want to see on the DIP board? Lets call it like that. I have some experience with pcb making so i will look into it.

Edit: but hell its a nice looking board full SMD. Maybe it would be a blasphemy to modify it lol ;)
« Last Edit: January 19, 2018, 10:02:47 pm by Gregi »
 

Offline texaspyro

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Re: $20 LCR ESR Transistor checker project
« Reply #4391 on: January 19, 2018, 10:47:47 pm »
What else you want to see on the DIP board?

Support for all the new fangled features would be nice.  Needs a nice color LCD.   I prefer the DIP package because it's so easy to fry the processor with a wayward charged cap, etc. and changing a socketed DIP is a lot easier than SMD reworking a SMD package.   Plus, I have a pile of Mega128's in the DIP40 package.
 

Offline Gregi

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Re: $20 LCR ESR Transistor checker project
« Reply #4392 on: January 20, 2018, 12:17:19 am »
It's like this... pcb is wide as DIP40, actualy a bit wider. It would look bad :P but it is doable (draw the board from scratch)
 

Offline Argiros

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Re: $20 LCR ESR Transistor checker project
« Reply #4393 on: January 21, 2018, 07:54:54 pm »

Re: $20 LCR ESR Transistor checker project
« Reply #4383 on: January 19, 2018, 03:18:48 PM »
Say ThanksReplyQuote
T3 s9014 is likely bad. Mine was bad and gave same symptom as you state. To check: before you start to unsolder the existing transistor run a ground from negative side of RED LED to ground. Doing this will create the ground that T3 should provide
Hope this is helpful
Fumio


Thanx Fumio,
I see my board GM328B has q1 q2 q3  smd tranzistors Their values are: a19t  , tl431a  , 1am
When I power on the led is lighting..
Maybe the q3 is bad...

For the conversation about the new models and features, I have to say that a bigger screen will be much nicer and also the new features and better accuracy are always welcomed !
« Last Edit: January 21, 2018, 09:22:52 pm by Argiros »
 

Offline kelchm

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Re: $20 LCR ESR Transistor checker project
« Reply #4394 on: January 21, 2018, 09:37:03 pm »
Is there any way to program a raw ATMEGA328P without an USPASP or equivalent programmer? I have several Arduinos available as well as a FTD1232 board.
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #4395 on: January 22, 2018, 11:08:51 am »
No, even a bootloader has to be programmed first. BTW, Karl-Heinz modified Optiboot to program the EEPROM also, in case someone is interested in ATmega bootloaders.
 

Offline perieanuo

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Re: $20 LCR ESR Transistor checker project
« Reply #4396 on: January 22, 2018, 11:55:07 am »
Yes you can use Arduino to write the Arduino bootloader or the ay-at fw on the new chips. Search Arduino as isp

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Offline vinceroger

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Re: $20 LCR ESR Transistor checker project
« Reply #4397 on: January 22, 2018, 07:00:05 pm »
Is there any way to program a raw ATMEGA328P without an USPASP or equivalent programmer? I have several Arduinos available as well as a FTD1232 board.

maybe this way
 

Offline kelchm

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Re: $20 LCR ESR Transistor checker project
« Reply #4398 on: January 25, 2018, 02:24:27 am »
Yes you can use Arduino to write the Arduino bootloader or the ay-at fw on the new chips. Search Arduino as isp
I ended up being lazy and just got a USBasp.  ;D

Has anyone else had issues with running a 20MHz crystal? I experienced really bad display corruption (missing/inforrect characters, random dots) and general flakiness after swapping the crystal and uploading the new firmware. I then swapped in a 16MHz crystal which seems to work fine.

I'm using 1.26M.
 

Offline MDM3D

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Re: $20 LCR ESR Transistor checker project
« Reply #4399 on: January 25, 2018, 02:37:32 am »


Yes you can use Arduino to write the Arduino bootloader or the ay-at fw on the new chips. Search Arduino as isp
I ended up being lazy and just got a USBasp.  ;D

Has anyone else had issues with running a 20MHz crystal? I experienced really bad display corruption (missing/inforrect characters, random dots) and general flakiness after swapping the crystal and uploading the new firmware. I then swapped in a 16MHz crystal which seems to work fine.

I'm using 1.26M.

Yes I thought it might have been from the long leads I soldered on for flashing but haven't had time to downgrade back to 16Mhz.

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