good morning I have a problem that more than 6 months ago I can not
fix it hehe I have no experience with programming ... I tell you my little problem ... buy a transistor tester M328KIT
https://www.ebay.com/itm/GM328-Transistor-Tester-Diode-Cap-ESR-Volt-Freq-Meter-PWM-Signal-Generator-DIY/152443029396?epid=577875436&hash=item237e500794:g:l3wAAOSw4A5YqU1i the original firmware version was 1.12K the problem is that I stopped working ... from one day to another did not want turn on only white screen and off ... well here comes my next step .. eh recorded again the firmware that I downloaded from this web and the problem persists on white screen with some firmware and others take to appear something like that is slow. and lately I found a firmware version 1.12k and 1.13k 1.33m turns on as fast as I should and starts asking me to make the short circuit with the 3 points 1 - 2 - 3 I do it ... but it does not do anything ... it keeps showing me the short-circuit message ... after a few minutes (1 to 2 mi nutos) keeps doing a test I guess ... until you get to ask me to put a capacitor of 100NF I guess that ... because it shows that on the screen ... when putting the capacitor ... it stays there branded and there it does not come out ... that same problem happens to me with 3 or 4 firmware that seems to work fine but in the end it remains if the rest of the effect shows white screen or it takes too long to show something on the screen ... can someone help me to put the firmware again to this version (I have not modified anything the device is as I buy it ... I'm only interested in uploading the firmware again and it works as before ..) please .... I need a little help
my English is terrible ... I hope you understand me something
Did you already replace the cpu?
If not, I would replace it for a new one and program it.
Did you already replace the cpu?
If not, I would replace it for a new one and program it.
good morning ... if I actually change it because the original wine when I recorded it so many times I changed the fuse I was blocked ... well now I bought 2 more cpu for tests and the same happens with both .. in the original also the same thing happened to me ... record the cpu with this file
https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/?action=dlattach;attach=445891 1.13 that they simulated the proteus and it starts everything well in its time ... the only thing is that it does not detect anything .. when wanting to program something ... and if I do selft test it does not detect the short circuit ... ... which would have to install and configuration of the fuse ... although I'm already ... tested with this line with all the firmware .. please can someone give me a hand I'm only interested in recovering the tester
avrdude -c usbasp -p m328p -B 0.5 -e -U flash:w:"TransistorTesterhex":a -U eeprom:w:"TransistorTester.eep":a -U lfuse:w:0xF7:m -U hfuse:w:0xD9:m -U efuse:w:0x04:m
nakcho,сan you make small video how the tester works with an firmware 1.13k and how you do calibration? Then it will be simpler to us to solve this problem.
nakcho,сan you make small video how the tester works with an firmware 1.13k and how you do calibration? Then it will be simpler to us to solve this problem.
good indman ... I've made a video from the start of the tester to the 100nf capacitor check. as to start does not detect any component ... then perform the calibration that asks me to make a short circuit ... in the three points 1-2-3 ... since a few minutes goes to the next step that the truth is not what does it do but it throws some data to me ... then it asks me to put a capacitor of 100NF that when putting it the truth that it does not do anything it remains enough time ... and it returns to be restarted but without any successful message ... and we continue without recognizing no data
I tested firmware 1.13 that was simulated in proteus ... is the best start ... if you delay as it did in its previous version 1.12k but with its problems of recognizing the components
here I attach the link from where I pulled version 1.13k that I do not know if it would be ok ... well ... I hope you can give me a little hand ... I thank you
here the link 1.13k
https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/4825/
here a demonstration video
Ok! I have several versions of the solution of this problem:
1. Use the original version of an firmware 1.13k Rev.798 Karl-Heinz which I have attached below.
2. If you have a reliable multimeter(DMM), then define precisely what voltage of Vcc stabilizer 7550 exit? I see on video what on the display is shown 5.13v. If it correctly, it exceeds that level which is necessary for normal work of a tester. It is necessary to achieve that voltage of Vcc was close to value 5.00v. Perhaps, it will be necessary to replace 7550 with other better voltage stabilizer(MCP1702,LP2950)!
3. Accurately remove 2 elements - protective assembly of SRV-05 and a supressor of P6KE(6V8) which I have marked on a photo in the yellow color.
4. Repeat the procedure of calibration after implementation of points 1-3. I remind you that at emergence on the display of the inscription "T4 Isolation probes", it is necessary to remove short circuit of test contacts.
The TC1 story continues. After replacing the MLCC filter caps for the Zener test voltage with a low-ESR electrolytic (higher voltage and no DC bias derating) I had still issues with the power supply. While checking voltages and other components I've noticed that D2 (rectifier diode for the Zener test voltage) gets hot also as the MLCCs did. My guess is that D2 has a too low reverse voltage rating causing current to flow back into the flyback transfomer. So I've replaced the diode with another Schottky with a higher reverse voltage and now everything seems to work fine. Also the battery current draw dropped about 50-70mA. Don't we love cheap dodgy parts?
Madires, at the owner of 2 identical LCR-TC1 one of device strong leakage of the accumulator was observed, charging lasted not for long, the analysis and check have revealed breakdown of one of C2-C4 capacitors - there was resistance on the "ground" slightly more than 1 kOmh! From + 5v the serviceable tester consumes current from 24,6mA to 44mA.
I would like to return to a problem of C11-C12 and to explain what it is desirable to apply high-quality capacitors with penetrative voltage not less than 100v to. Below I will attach the photo of impulses which are developed by a chip of U5 with a frequency about 1 MHz for food of primary winding of the pulse transformer.
Impulses voltage in this chain reach values from -17,6v to 65,6v, and their amplitude depends on accumulator voltage, the charge is higher, the amplitude is higher.
Yep, a filter cap rated for 100V makes sense. After replacing the dodgy parts the Zener test voltage is nearly 50V DC without load (just the the voltage divider for measuring the voltage).
I'm not sure whether I want to use a (AY-AT) tester with an 8 MHz or 16 MHz crystal. Would one of these things form a tight connection while allowing the crystal to be changed? I'm afraid that the crystal would be too loose because it's not sprung like a DIP socket:
Is the only advantage to double the resolution of capacitance measurements? I'm not really interested in using a colour-screen. I was planning on buying a separate ATMEGA328 so I could experiment with the custom firmwares but easily go back to the original configuration when I inevitably fail.
I'd try the non-precision type socket terminal with the fork contact or a non-precision IC socket. The higher MCU clock frequency will improve any time based measurement (not just the capacitance) and also allows higher frequencies for PWM and square wave (and frequency counter).
If I remember correctly, they laughed because in that specific picture that 10 K resistor was loose.
Thanks very much. I already have some of the first kind; I didn't realise it has springy contacts.
Incidentally, I just made a feature request for the custom firmware:
https://github.com/svn2github/transistortester/issues/2 - do you know whether it is a feasible request to have an LED tester function where you can specify the current you want to test at and then the tester tells you the forward voltage needed to pass that current? Normally, it's a bit of a hassle to determine this with two multimeters.
Would one of these things form a tight connection while allowing the crystal to be changed?
I use machined pin headers to socket crystals, and they work fine.
Incidentally, I just made a feature request for the custom firmware: https://github.com/svn2github/transistortester/issues/2 - do you know whether it is a feasible request to have an LED tester function where you can specify the current you want to test at and then the tester tells you the forward voltage needed to pass that current? Normally, it's a bit of a hassle to determine this with two multimeters.
The repo at github is just an automatic clone of the original one at mikrocontroller.net and isn't maintained by anyone. So please post suggestions to one of the forums (mikrocontroller.net or eevblog.com) or send an email.
The tester's circuit doesn't support a variable current adjustment. Therefore it isn't possible to implement the feature you've suggested. BTW, the standard diode check provides a current of about 7mA.
Incidentally, I just made a feature request for the custom firmware: https://github.com/svn2github/transistortester/issues/2 - do you know whether it is a feasible request to have an LED tester function where you can specify the current you want to test at and then the tester tells you the forward voltage needed to pass that current? Normally, it's a bit of a hassle to determine this with two multimeters.
The repo at github is just an automatic clone of the original one at mikrocontroller.net and isn't maintained by anyone. So please post suggestions to one of the forums (mikrocontroller.net or eevblog.com) or send an email.
The tester's circuit doesn't support a variable current adjustment. Therefore it isn't possible to implement the feature you've suggested. BTW, the standard diode check provides a current of about 7mA.
Thanks. What if it just ramped up the voltage until the desired current was reached? Wouldn't that achieve the same thing? Is 7 mA the upper limit?
Hello, can you guys help me out to find wich firmware goes with this device?
Thanks in advance.
I don't know but the PCB looks nice. Programming header too.
It looks like the T3 but this has one extra button, so I'm not sure.
Hello, can you guys help me out to find wich firmware goes with this device?
Thanks in advance.
It is the same the clone under the name Fish8840 only covered with white paint.
Compare to photos which I have attached. The firmware for this clone can be taken from Karl-Heinz's distribution in the "mega328_7565" folder.