Microcontroller based curve tracer

Electronic Curve tracer for measure and compare components on circuit boards

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This project was based on the Huntron Trackers. I could not afford to buy one, so I developed my own ones and built them.

What is it good for?

It is good for compare a working and a not working circuit board, without you have to apply any power to it. A curve tracer show Voltage - Current characteristic of any electric component, like diodes, capacitors, CMOS ICs and many more, which you want to look.

This equipment mostly used in repair purposes

I created three version of the tracker, called Version 1 , Version 2 and te most recent one is Version 3. SUF joined the development, and he is currently designing and testing a new version which will be the Version 4. Below this lets see how each version works.

Version 1

I started develop this version around 2017, when I saw a Huntron tracker at my work and I thought it is not too difficult electronic, but so overprice at the same time.

The Version 1 has just one voltage and one frequency range, so it is a very basic model. The basic idea behind a curve tracer a simple circuit, which input is a sine wave and has some resistor in it. We need a current limit resistor and a current sense resistor.

The other big part is a dual channel oscilloscope with X-Y mode, or like my version I used a cheap arduino pro mini and a display, it is more then enough for a basic operation. I added a function, with the tracker can save a curve on the display and can measure an other component at the same time, so with that you can compare a good component with a bad component.

Tracker Version 1

The schematic is a updated version, with some compensation, and modification on it, I could reduce the short circuit difference, so the line is almost vertical on the screen, when the two probe is shorted.

The upper op-amp is the voltage sense (X axis on the screen), the lower op-amp is sensing the current, which is flowing through the measured component (Y axis on the screen).

Some picture about the Version 1

Tracker Version 1

Tracker Version 1

It is not too pretty, but it works well, for a beginner I recommend to start with this, because it is cheap, and after easier to improve. 

Version 2

The second version is basically a much closer producte what I really wanted to create, it is based on the Version 1, but I learned a lot from my mistakes. I wanted a multi range and pc compatible version with the stand alone usability without pc, so most of the time I can use it like a independent device, but if I have to I can save the curves to the pc as well. The development was long, it took me more than half a year, and a lot of money as well. I think it is worth all the time I puted in it.

Lets start show what I am talking about.

Tracker Version 2It has 25 voltage range, 5 resistance and 6 frequancy range. The screen is a 4" mcufriends tft touch screen, but in this operation I did not put any function on the touch screen. The Version 2 has two channel, it is more easier to compare curves at the same time.

The buttons light up when the actual function selected.

This device is much more complicated then the first version was, so I do not recommand a beginner to try to build this.

More info about this version you can find below at the log section.

Version 3

I started developing a new version after a couple months the Version 2 was finnished. This will be similar to the Tektronix TR210. It is basically the Version 2 without the screen and any pc connection option. For this version you need a dual channel oscilloscope, but I think it is not a problem for that who is looking these types of instruments. This version also open source, so everyone can modifie and develop it.

Version 3  have 6 voltage ranges, 6 resistance and 3 frequancy ranges, it also capable to measure two channel alternatly.

You can find the documentation at the download section.

A bit of explanation what the circuit will do. The arduino pro mini at the left acting as a Digital - Analog converter, so it is generating sine wave at variable frequency ranges. Next the signal is going to a digital potentiometer,...

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  • Current state in pictures

    SUF10/02/2018 at 06:38 0 comments

    There are many things happened since my last real project log.

    In the V4 almost all of the controls are working with PC control: -frequency, amplitude, current control resistance, DUT switching and alternating.

    The only thing left until the equipment start to work as expected is the measure amplifier control. On the other side I've long road ahead.

    The planed roadmap (without dates):

    - Measure Amp (milesetone, the equipment works with external XY oscilloscope)

    - ADC control software

    - Measurement display on PC

    - Add SS1963 based 5" display

    - LAN board

    - USB Flash

    - SD card

    - Finalized MCU board

    - Front panel control test

    - Front panel board design

    Until those, here are few pics made during the development:

    Arrived boards:

    Finished PSU:

    The PSU measured output voltages:

    Power Amplifier built:

    Almost all of the analog electronics + the MCU dev board:

    Mesaure the phase shifting of a 22uF bipolar electrolytic capacitor:

  • Repository

    SUF09/26/2018 at 07:46 0 comments

    It is just a quick note. I made the source control repository publicly available. You can find it here:

    Please be aware. The hardware designs, firmware source, PC software source is under heavy development. Every commit goes to the master branch. No reason to switch to any kind of branching model (gitflow for example) yet.

    Please do not use the repo for building the instrument. It WILL NOT WORK!!!

    The repository is there for two purposes:

    1. Support our development effort.

    2. Give some outlook about what we want to achieve.

  • Fake in China

    SUF09/13/2018 at 20:23 0 comments

    I'm continuously working on this Curve Tracer in my spare time. I designed a Vishay VO14642 photovoltaic SSR into the circuit. It is quite a nice, but pricey device.

    I thought why not try to order it from Aliexpress. For control I also ordered a few from Mouser.

    Both devices on the same board:

    The original on the left

    The fake measured

    The original measured

    This device should have 0,25 Ohm maximum on resistance. 

  • Boards, MCU change

    SUF08/21/2018 at 21:25 0 comments

    This log is intend to be a small status update without deep explanation of circuit or software description.

    1. I've finished the PCB design all of the three analog boards together with the PSU. Here are the pictures of the board designs:

     2. The schematics are changed a bit according to the board routing and some component availability. I uploaded the updated schematics to the files section (not too much changed)

    3. All of the boards ordered from JLCPCB. I'm expecting to get them until end of tomorrow.

    4. All of the components ordered from various sources: Lomex (local), HQElectronics (local), Mouser. Unfortunately I had some misunderstanding with Mouser about my companies status, therefore they canceled the order of the TI opamps. So I finally ordered the opamps directly from TI. Hopefully I'll get everything by beginning of the next week

    5. I had not too much lack with the selected MCU.

    First I tried to use Arduino for the programming. The STM32DUINO is almost unusable when you want to do something deeper hardware related. Running the Timer-DMA-DAC as a sine wave generator was unsuccessful. After a few days struggling, switched to CubeMX + Atollic TrueStudio. With this environment, it started to work almost instantly. After this I tried to put together the USB-CDC communication unsuccessfully. After many tries, also involving other development boards, it become clear, that the USB code generation of the CubeMX for F3 simply doesn't work (we will see if any suggestions come:

    So I switched the project to F4, to be precise to STM32F407VG. Actually I'm using the STM32F4-Discovery board for the development, what I already have for years.

    The sine wave generator works, I've some USB communication, I've the command interface for the components (the commands still not work via USB, but it is on the way).

    The plan actually, to build the first iteration of the V4 device, completely controllable through the USB port and using a PC software for all of the functions and display. The integrated LCD and controls will come in the second iteration.

  • Analog circuits

    SUF08/10/2018 at 13:25 0 comments

    I'm heavily working on the next version of the curve tracer. Today I almost finished the schematics of analog modules of the device. All of drawings are uploaded into the files section. Actually everything reside in a private repo on the GitLab. This will be publicly opened when I order the first revision PCBs. Until this time the whole circuit is so shaky that I don't want anyone to build it, because the design will probably heavily changed and there are incompatibilities exists between the schematic an PCB designs.

    About the circuitts

    Power supply module:

    The power supply use a enclosure mounted toroid transformer with two 14V secondary windings (probably a 100VA model). The circuit itself provide +-15V from linear regulators mainly for the analog circuits and the power amplifier, a +5V and +3.3V from buck converters for the logic circuits (plus MCU, Display, etc.). And a four channel buffered rail splitter (virtual ground) used for the level conversion of the ADC and DAC (probably two will be used, but it is easy to build four from a 4 channel opamp)

    Power Amplifier module:

    It converts the 0.65V-2.65V swing sine wave from the MCUs DAC module to +-10V (20Vpp) gound referenced load capable signal.

    In the input I put a unity gain differential amplifier. This will convert the input to -+1V by substracting the 1.65V reference DC from the power supply.

    The next stage is a 1.28x gain non-inverting amplifier creating 2.56Vpp signal. This signal attenuated by a 256 step digipot. This give us 10mV step control of the power amplifier. The power amp has a 10x gain. So the result: we can control the output voltage of the amp 0-20V in 100mV steps.

    Attenuator module:

    This module control the current limiting resistors on the output of the Power Amplifier. As requirement we can't use conventional mechanical relays mostly because of the noise it makes. Therefore I choose three different kind of solutions to set the current limiting resistor value (we need AC capable devices):

    1. Low current version: ADG451 (or ADG441) and ADG1411 analog switches (capable around 100mA)

    2. Medium current version: Vishay VO14642 photovoltaic AC MOSFET SSR (capable 1A AC)

    3. Load switching: Si8751 isolated MOSFET drivers + dual MOSFETs (capable 4.5A AC)

    Also this circuit provide the TVS protected output for the DUT and the measurement point for the output current and voltage. The output current measured across the whole resistor network and not on an additional current sense resistor. This solution probably generate less noise, but on the other side more sensitive to the temperature drift of the resistor (we will see, how this works in practice)

    Measurement Amplifier:

    This is a two channel amplifier one for the current, and one for the voltage. The input signals are buffered with two unity gain amplifiers. The voltage signal is coming from the voltage across the DUT and amplified by a "PGA" capable of creating x0.1, x1, x10, x100 and x1000 gain respectively. The current signal is comming from the voltage across the current limiting resistor. As this is not ground referenced I used a differential amplifier configuration with x0.1, x1 and x10 gain.

    The outputs of this circuit can be directly connected to the oscilloscope X and Y inputs and will be also connected to the MCUs 12bit ADC through a level shifter (not implemented on this board) 

    This is all for now. More to come.

    If you have any question, suggestion on this design, please let me know in the comments

  • MCU Selection

    SUF07/31/2018 at 19:03 0 comments

    As I mentioned earlier I wanted to change the two AVR MCUs from the original design to a single 32bit one.

    Here are my selection criteria:

    • Two at least 12bit DAC channel - One channel is used for the sine wave generation, the second maybe used for the pulse generation (not designed, decided yet, but better if it is available)
    • Two at least 12bit ADC channel - For measuring current and voltage on the DUT. If parallel sampling and/or differential input available is good but not requirement
    • DMA for DAC operation
    • 32 bit core - ARM Cortex-Mx prefered
    • Arduino framework support, free, native C/C++ IDE support (I haven't decided between the two, so the support is necessary)
    • Low cost development board
    • Easily solderable (for me. Means: TQFP accepted, QFN, BGA not - I know this is my personal limitation, but I don't want to learn it right now)

    Based on the specs above my choice is an STM32F303RET6:

    And the development board for it:

    I ordered the board from Farnell yesterday. Today arrived:

    Next: seting up the development environment

  • V4 Anouncement, new member

    SUF07/29/2018 at 15:34 0 comments

    Hi Everyone,

    My name is Zoltan Gomori (SUF). I recently joined the project to speed up the development.

    I started to develop the new V4 version of our curve tracer. Here is what you can expect:

    Now, I'd like to summarize a few design concept for the project.

    I started to work from the 3rd version. As I see now, It can be called as the 4th version because it will have so much differences.

    1. Modular design. I want to be able to use the design either with internal display or with an oscilloscope
    2. Use one 32 bit MCU instead of the current two 8 bit AVR (most probably an STM32)
    3. Internal power supply
    4. Based on the Huntron Tracker 3200S specification - except the 128bit scanning interface
    5. Complettely elliminate mechanical relays (even the reed ones)
    6. Get rid of the most of the digital potentiometers - not really fits for the needs, using resistors and analog MOSFET switches instead
    7. Get rid of the discrete R-2R DAC using an MCU integrated instead
    8. Utilize MCU integrated ADC/DAC/DMA as much as I can
    9. Get rid of the trimpots as I can (probably need to keep it for some offset setting functions)
    10. Keeping the error of the equipment around 1% every place (it is not a high precision equipment. If we want to decrease the error significantly, it cause significant rise in the costs)
    11. Adding the pulse generator as an optional module. It was missing from the 3rd version
    12. Adding the lower current limiting resistor ranges (down to 10 ohms)

    First of all, I made a block diagram of the equipment:

  • Files for Trackers

    Máté Tóth04/08/2018 at 19:08 0 comments

    Dear all,

    I uploaded all of the latest drawings and ino (arduino) files for all 3 version.

    You can find in the "File" section, and you can download those.

  • Version 3 is done!

    Máté Tóth03/18/2018 at 17:07 1 comment

    I finnished the Version 3 prototype, every function is working now. I found tested some future development on it, and I managed to connect it to the PC, so will be also capable of saving curves onto an excel sheat. I need some time and I will finnish the configuration on this also.

    Here is a video about every function:

    Some picture:

    Curve Tracer Version 3
    Curve Tracer Version 3
    Curve Tracer Version 3
    Curve Tracer Version 3
    Curve Tracer Version 3
    Curve Tracer Version 3
    Curve Tracer Version 3
    Curve Tarcer Version 3
    Curve Tracer Version 3

    I am quite happy about the prototype, I think it is better then what I expected when I started. Now I have the final circuit so I am looking forfard to designing my own pcb for it. 

    It still missing the power plug at the end, but I will place it.

  • Version 3 #2

    Máté Tóth03/15/2018 at 17:39 0 comments

    Hi everyone,

    I did some progress on the Version 3 prototype, it has more working function then before. I am still facing with some hardware butg, what I inherit from the Version 2. I found out the original circuit has big issues, because I did not had Oscilloscope when I developed the Vesion 2 I could not see these issues before. The Voltage ranges was messed up. Most of the issues I could fix, but it has still some.

    A little bit about the spec:

    • 6 Voltage range (6 Current range)
    • 6 Frequency range

    And the video:

View all 23 project logs

Enjoy this project?



eduardo ruiz wrote 06/23/2019 at 16:47 point

Al aire libre

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eduardo ruiz wrote 06/23/2019 at 16:47 point

Al aire libre

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vagner_xu wrote 03/23/2019 at 19:32 point

gostaria de montar a verção v1 vc poderia me mandar o que eu preciso só para v1 

funcionar no pc via usb ? por favor

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vagner_xu wrote 03/23/2019 at 19:26 point

Detalhes gostaria de montar v1

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feridunbilgin1993 wrote 02/05/2019 at 00:02 point

Hi, how many ampere transformers need to use for version 3, how many watts of energy is needed, thank you

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feridunbilgin1993 wrote 12/06/2018 at 18:00 point

My Name is Feridun. I like to follow your projects, if you ask v3'in share detail with me,

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SUF wrote 01/07/2019 at 18:33 point

all of the project files can be find in the gitlab repository

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grantfullen wrote 09/24/2018 at 03:17 point

I am intrested in building the v4 as a kit. Let me know if you going to offer as a kit , or I can source all the components myself once you post the final files. Great Job............

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SUF wrote 09/26/2018 at 07:07 point


The v4 is in the lab today. We are although it is OpenSource (I'll post the repo after this  answer), we are plan to sell it when finished. Complete unit for sure, panels, kits are under consideration. Please don't expect it shortly as still a long road ahead until the finished equipment. 

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Marek wrote 07/08/2018 at 14:58 point


Could you give me schematic data and a list of components like display type etc Versions 2 ? 

Well thank you.

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worrawit wrote 05/14/2018 at 02:13 point

Hi, Máté

I'm sorry.I'm not good English.

Thank you very much. For the document you uploaded.

What version of the board INO  do you use for the project Tracker_V2?

I use the board Arduino mega 2560.

Do not compile source code. Error  

tracker-V2_2017.04.10:157: error: 'REG_ADC_MR' was not declared in this scope

   REG_ADC_MR = (REG_ADC_MR & 0xFFF0FFFF) | 0x00020000;


tracker-V2_2017.04.10:162: error: 'DAC0' was not declared in this scope

   analogWrite(DAC0, 100 );


tracker-V2_2017.04.10:757: error: 'DAC0' was not declared in this scope

   analogWrite(DAC0, freqvalue );


Thanks! brother

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Máté Tóth wrote 05/14/2018 at 04:08 point

I used Arduino Due, that why you have errors. Due has 16 bit adc an 2 Dac. 

That what the errors say.

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John Rad wrote 04/06/2018 at 15:50 point


Do you have the INO for Version 1?

If you are not sharing that, can I ask if my assumptions are correct;

- X axis is A7 input, Arduino , Voltage

- Y axis is A5 input, Arduino, Current

and I will make up some plotting code that is X vs Y  with 'previous plot' persist feature.

I will port over to Arduino Nano V3 clone which are flooding Canadian market now at $8cdn

I assume Op Amp is dual or quad, rail to rail, single +5V . LM339? Not high frequency.

I assume I could use a 9VAC transformer secondary to run a Regulator 7805 into the Ardy NanoV3 for power and isolate the Laptop USB (+5V) for safety.

What settings for the pots were useful in testing? R3(gain)&R4(offset) adjust Volt X axis ranging, so setting them for a nice amplitude ratio is obvious. R5(gain)&R6(offset?) adjust the current Y axis scaling. 

The tricky settings will be  R1(I-Limit) and R2(?I-shunt?) settings. I have 50Ohm 10turn pots but it may be that a good setting comes from display on Red-Black lead short circuit current, which I think I would like to be 1mA or lower. I have a 1982 DynaTracer

and its highest in-circuit current is 333uA or 1/3rd of my multimeter but with like 16.8VAC on my true-RMS Fluke, so like a bit high. That DT-1 adapter used the famous low profile FlatHead 115 VAC primary - 12.6 VAC dual series secondary and I have had issues with testing delicate 3.3V modern logic.

summed up:

Your V1  is a good front end for an Ardy NanoV3 with cheapo display OLED 0.96 128x64, total $15 here in Canada.

I had a Huntron1000 for 17years and  I am familiar with the characteristic failure mode waveforms on V+/- and I+/- quadrants. (the problem is that Tracer+Oscope+AC+probes is not really 'portable' IMHO).

If any of the other readers have INO to share, post them somewhere and publish that link here in this forum. Please and thanks

Wishing Well:

A 'self contained Pen' (like:logic style) Probe with small 128x64 Oled I2C 

using your V1 front end, 

and psuedo-sinewave transformer oscillator from arduino as source, 

all running from Li-Ion single cell 18650. 

the problem may be that a mini audio TXfmr may not have enough power at output (1000:8ohm oldschool style)  to make a V/I display "work"

A Huntron in a Pen with USB charging, and ground clip, for comparison sniffing.

You V1 thing, cased up V2, and the range chart in V3 (settings 2 and 6)  gave me the idea.


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Máté Tóth wrote 04/08/2018 at 19:06 point


You can find every documents in the download section.

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eyyubkoseoglu wrote 03/20/2018 at 11:57 point

Hi Friend... thanks for information about your Project. it is a nice job. ı like it. I am an electric and electronics teacher in a high school in turkey. I want to make it your Project. Can you share me your Project details.

my email is or

thanks for your interest

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feyyaz kurt wrote 01/27/2018 at 08:42 point

Hi, sorry for my bad english. The progeny are great. please share with me from the developments and documents.

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gomecatronica wrote 10/04/2017 at 02:33 point


The project is very interesting it will be very good to link it with a database in such a way that the curves of the article have been analyzed, I can collaborate on that topic.

My email is



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worrawit wrote 10/02/2017 at 04:05 point

Hi, Máté
I'm sorry.I'm noot good English.
It is a beautiful project.
Could you upload arduino code curve tracer V3 files if thats ok or send to this Thankyou verry much.

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Máté Tóth wrote 10/04/2017 at 20:57 point

Hi, worrawit

I did not write the code yet, i still have to write it, sorry.

Thanks for your interrest.

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worrawit wrote 10/07/2017 at 06:29 point

Hi, Máté Tóth

Thank you for answering my question.

Can you send a source code  version 2 by email?

I have doubts about this. How you wrote source code read analog input 2ch plot to curve trac and show on tft lcd to smooth it..

Thanks you very much.

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dardo wrote 08/19/2017 at 01:48 point

Hola, gracias por tan gran aporte, espero puedo resolver la versión 3, si puedo ser de ayuda dejo mi mail 

Le hago una consulta, el transformador de características es?

El código en la descarga es de la versión 1 ?

En la versión 3 usaría tres arduinos?

El MICRO, el DUE y el MEGA?

Saludos Dardo

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Davey3D wrote 06/28/2017 at 13:58 point

Do I read correctly that you are not able to add beyond version 1? It would be nice to know so that I can plan to add some features myself or wait for you to release the information or an actual product to buy. I don't have nearly as many features as your V2. 

I think it  would make a nice product but I am guessing that you may have troubles with Huntron or some of the other manufacturers. I hope they have not caused you legal difficulties! :-( Perhaps you can sell it to them lol? Theirs looks primitive compared to this and I'm sure will not cost $2k ~ $4k  to make.

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Máté Tóth wrote 06/28/2017 at 16:20 point


I did not  have any problem with Huntron. I can sell my trackers I guess.

The Version 1 documentation you can find at the download section, but it is not too well made. I am working on a new updated Version 1 with better documentation and a new Version, which is called Version 3. It will be like the Tektronix TR210, but much cheaper. 

The Version 2 is waiting for some finishing, but it is in use at the moment. I am not sure what I wanna do with these, but I am sure I would like to make it open source and both make a kits from them, so I can get some money to develop new features.

If you are interrested, i am locking for people, who wanna help developing these.  (Like Open source project) 

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Davey3D wrote 06/28/2017 at 21:32 point

I think a kit would be very popular. It would be too ambitious for me to tackle without one. I'm a hardware person that knows just enough programming to be dangerous lol. I don't know what I can offer there. Is there specific help that you're looking for? I have been thinking of ways of making something like this for a while. I decided to google before I started serious design and this popped up.

The V1 docs are fine from what I saw.  Perhaps not for an inexperienced person. The big limitation in the V1 design as you know and resolved is that it relies on the fixed 60hz signal. The other you've solved as well- the ability to compare 2 channels "A-B" testing. 

There are a couple of other players in the game that you may
already be aware of. This is probably closest to what you're doing- big
difference is that it's windows based. I think it's around $1K - $1.5K from
memory.  google: FADOS9F1

At the other end is the Saelig ABI System 8. It's an extensive system- starting around $6k. The AMS is the VI module. "Using a novel approach to V/I signature testing, the SYSTEM 8 AMS increases test coverage by varying the frequency of the test signal to observe the DUT's Device Under Test) response over a frequency range. This can lead to finding faults not detectable with other instruments."

It has 64 channels and can do a matrix scan. Rather than comparing the test point against a single ground reference, it can test one test points against multiple other test points. Our company is looking at buying one as the 64 channels and requiring less operator interpretation is better for a production system. 


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Walter wrote 06/19/2017 at 03:12 point

This project is way awesome!

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PROFESOR wrote 03/08/2017 at 21:31 point

Hi, Máté Version 2 is a beautiful project as you can see from the picture. I wish you continued success.

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Máté Tóth wrote 03/08/2017 at 22:06 point

Thank you, I am planing to make a PC software for it, with that I will can save curves, and that is the goal.

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PROFESOR wrote 02/24/2017 at 17:11 point

Hi, Máté wonderful project. You will share files. ??

Best regards

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Máté Tóth wrote 02/24/2017 at 18:20 point

Hi PROFESOR, Thank you. To be honest with you all of who here because of you want to build it. I have to tell, I have many many reasons why I should not to publish everything about my Version 2. It is not fully my decision.  I am sorry, have to tell you now, but I can not publish the version 2 schematic and code.

But I will polish the Version 1 and fix al those bugs That have, and I will give every information about the Version 1 tobyou

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xt1541xt1541xd1541 wrote 02/24/2017 at 16:52 point

cool Mate hope you finished soon !

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Máté Tóth wrote 02/24/2017 at 18:13 point

I hope so

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