11/28/2016 at 12:29 •
I am about to start build the updated version of my curve tracer. I was thinking about a lot, what will I need to improve the functions on the tracer. I was looking the Huntron 3200S spec on the internet, when I specified the functions on mine tracer.
I was sure, if i would like to updrade, I will need more space and a bigger screen, because the last one was a bit small (2.3" LCD). I found a 3.95" LCD touch screen with better resolution (480x320).
The new version will have:
- Two channel input with alternating function, and with that I will able to compare two component at the "same" time.
- Multiple frequency, voltage (sine wave) and input resistance ranges.
- Some buttons with inbuilt LED and a touch display for the easier operation.
- End of the project I would like to make a software for PC and with that I will can log characteristics for save that later repairs.
- If I will have enough money, I would like to make a scanner, wich has around 64 input to measure characteristics on IC-s directly with much better speed.
Only one main part missing, which is an Arduino DUE.
Some photos about parts, what I bought:
01/02/2017 at 19:35 •
As I promised, I uploaded the project files for my first version curve tracer. I am finally had some time to clear out the arduino code and make a proper schematic for the curve tracer. Everyone can find and download the files.
Some instruction and explanation:
R1 is a current limit resistor which is setted to 2K ohm.
The R2 resistor is a current sense resistor, I had to put in, because a did not have enough signal to drive the op amp. It is setted to 93.5 ohm.
R3 and R5 are the set resistors to the gains.
I used a TLC2721P precision OP-Amp for create the signals, what did need for the arduino. The R4 and R6 are voltage dividers, in ideally these are set in to the middle, but in my case I had to adjust these to set the line in the middle on the screen.
First have to download the sketch to the arduino and put together the circuit. After have to set R1 and R2 to the correct values.
Then you have to set offset of the Op-Amps (R4 and R6), if you have everything right, you have to see a horizontal line or dot somewhere on the screen. Then you adjust it to the middle with R4 and R6. If you short the probes you shoud see some deflection to vertically.
If the line or dot is in the middle, after you have to adjust the gain with R3 and R5. After all you shoud see a horizontal line when nothing is connected to the probes, when you short the probes you shoud see a vertical line in the middle.
After all these setting you are ready to use the curve tracer.
01/02/2017 at 19:59 •
I mentioned in the last log, I had not too much time build the Curve tracer V2, because of the holidays.
In January I would like to put together the hardware section of the tracker, I did already finish the front of the device, it is looking good I think. After I got the Arduino Due I put ut together with the screen, and started work on the display functions, which is far to be done, but it is something.
The buttons will light up when you selected the mode with them.
I am planning to make a sticker for the front, to hide all mistakes what I made, and also it will looks more professional.
Some picture of the current state:
01/10/2017 at 22:45 •
So I am done with the case, and the front electronics, the screen, buttons and LEDs all works.
A little demo video, how it gonna look like.