Author Topic: $20 LCR ESR Transistor checker project (Read 3439714 times)

ko4nrbs · « **Reply #6925 on:** May 28, 2021, 01:50:57 pm »

The back light does not come on. Thanks for the schematic!!
Bill

madires · « **Reply #6926 on:** May 28, 2021, 02:03:25 pm »

And the LED (right of the battery connector)?

ko4nrbs · « **Reply #6927 on:** May 28, 2021, 02:08:38 pm »

Is Transistor T1 a 2SA673? I can't see the text on the schematic very well. Couldn't find it's pin out. It has 9vdc on the two contacts that are on the same side to the single contact on the other side.
Bill

ko4nrbs · « **Reply #6928 on:** May 28, 2021, 02:10:23 pm »

The LED does not light up either.
Bill

madires · « **Reply #6929 on:** May 28, 2021, 02:15:37 pm »

Yep, T1 can by any jelly bean PNP with an hFE of around 250 or higher. Do you get 5V at the output of the voltage regulator IC1 when pressing the test button?

ko4nrbs · « **Reply #6930 on:** May 28, 2021, 02:26:17 pm »

Checked all three contacts on IC1 to the GND contact on the other side and to each other. No output voltage when pressing the test button. Also checked both sides of C4 with no voltage see while pushing button.

Bad IC1??

Bill

madires · « **Reply #6931 on:** May 28, 2021, 02:31:33 pm »

And also no input voltage (battery)? Then it could be a bad T1.

ko4nrbs · « **Reply #6932 on:** May 28, 2021, 02:35:57 pm »

Both the contacts on T1 that are on the same side read 9vdc to GND.
Bill

Yuriy_K · « **Reply #6933 on:** May 28, 2021, 02:38:02 pm »

Change T1, I changed mine twice, until I replaced it with a larger body ...

ko4nrbs · « **Reply #6934 on:** May 28, 2021, 02:42:14 pm »

No voltage on either side of C10 or R20. Must be T1. What transistor did you use?
Bill

Yuriy_K · « **Reply #6935 on:** May 28, 2021, 03:34:25 pm »

Quote from: ko4nrbs on May 28, 2021, 02:42:14 pm

Must be T1. What transistor did you use?

PNP S9012 hFE=227.

ko4nrbs · « **Reply #6936 on:** May 28, 2021, 03:49:58 pm »

Can I use a TO92 pin type instead of a SMD 2T1 type?
Bill

Yuriy_K · « **Reply #6937 on:** May 28, 2021, 04:00:17 pm »

yes, Ic (mA) = 500, OK!

ko4nrbs · « **Reply #6938 on:** May 28, 2021, 04:03:01 pm »

I ordered 50 SMD type. If I screw up I have plenty of extras!!

Thank you for the assistance!!
Bill

Yuriy_K · « **Reply #6939 on:** May 28, 2021, 04:11:55 pm »

Quote from: ko4nrbs on May 28, 2021, 03:49:58 pm

Can I use a TO92 pin type instead of a SMD 2T1 type?

Of course, the location allows

madires · « **Reply #6940 on:** May 28, 2021, 05:35:34 pm »

In case of through-hole the BC328-40 (I_C -800 mA) is a good choice.

Yuriy_K · « **Reply #6941 on:** May 28, 2021, 05:44:36 pm »

No, there is a two-sided mounting without pass-through holes.

madires · « **Reply #6942 on:** May 28, 2021, 06:51:29 pm »

The SMD equivalent (SOT-23) would be a BC808-40.

Yuriy_K · « **Reply #6943 on:** May 29, 2021, 10:26:57 am »

Ttesters with installed software Karl-Heinz Kübbeler 1.13k, after minor alterations, can test IGBT transistors. Everything in the picture ...

Checked out similar add-ons for ComponentTester-1.43m. With insufficient gate voltage, an additional battery allows you to get readings ...

ko4nrbs · « **Reply #6944 on:** June 01, 2021, 10:33:24 pm »

Quote from: ko4nrbs on May 28, 2021, 04:03:01 pm

I ordered 50 SMD type. If I screw up I have plenty of extras!!

Thank you for the assistance!!
Bill

New transistor fixed it!!

Thank you.

Bill

Andbro · « **Reply #6945 on:** June 03, 2021, 11:03:18 pm »

Hi Yuriy_K,

With the new GM328A model with a MCU for the display, i load by USBASP your firmware and it's over ?

Thank

Yuriy_K · « **Reply #6946 on:** June 04, 2021, 03:19:40 am »

Quote from: Andbro on June 03, 2021, 11:03:18 pm

With the new GM328A model with a MCU for the display, i load by USBASP your firmware and it's over ?

Your model differs from those Ttesters, which were used for debugging and adjusting the color gamma. Without seeing the back side of your display, i cannot determine the RGB or BGR gamma ...

Andbro · « **Reply #6947 on:** June 04, 2021, 08:52:19 am »

Hello Yuriy_K ,

Probably my display is BGR. After changed the frequency for 8Mhz, it's impossible to WINAVR MAKE ALL".
I have always 2 errrors.
One warning for CPU unsigned long wish_freq; // frequency (Hz), which you want to create
../Obj/ST7735_BGR/PinLayout.o: In function `ldata_ipp':
(.text+0x94): relocation truncated to fit: R_AVR_13_PCREL against symbol `lcd_data' defined in .text.lcd_data section in ../Obj/ST7735_BGR/lcd-routines.o
make.exe: *** [../Obj/ST7735_BGR/ST7735_BGR.elf] Error 1

thank

Yuriy_K · « **Reply #6948 on:** June 04, 2021, 10:36:35 am »

Quote from: Andbro on June 04, 2021, 08:52:19 am

After changed the frequency for 8Mhz, it's impossible to WINAVR MAKE ALL".

Why are you trying to create your own firmware? You won't succeed !!! My sources are very different from the Author's.
You can only install my finished firmware using AVRDUDE ...
Added to the message on the previous page ST7735_RGB_en_8MHz.zip, sorry did not notice ...

Andbro · « **Reply #6949 on:** June 04, 2021, 12:20:03 pm »

Hi Yuriy_K,

I have questions:

- What is the difference between the firmware ST7735_BGR_en and ST7735_BGR_en1?
- The Vext is not available ?
- How work the f-Generator ?
- How can i modified battery voltage display (Display 8.15V, Real 8.9V)
- How change the rotation menu ?

Thank


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Author Topic: $20 LCR ESR Transistor checker project (Read 3439714 times)

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