Semiconductor Curve Tracing Using Function Generator/AWG

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Күн бұрын

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@KerryWongBlog 4 ай бұрын

Please turn off "Stable Volume" in the video playback setting (the first menu item after clicking the gear icon) as for some reason, this new KZbin playback feature made the video much noisier than usual.

@MsFireboy2 Ай бұрын

Question? This is reference to your Not another Curve Tracer. I found that you can use a cd4060be ic chip and a CD4024be and the R2R resistor ladder to build a Stair Step Generator circuit. Thanks for your input.

@WiktorOstrowicz 6 ай бұрын

Simple formwork but works great, great explanation. Greetings from Poland.

@adrian.parano 3 жыл бұрын

Very good video!! thanks for sharing!!! Regards from Buenos Aires, Argentina

@robbieaussievic 3 жыл бұрын

...... Informative, articulate, clear, concise, and above all, 'Cool for Cats'. Well done Mate.

@HitAndMissLab 3 жыл бұрын

I was looking for video like this for ages. Thanks!

@KerryWongBlog 3 жыл бұрын

Glad you liked it!

@uni-byte 5 ай бұрын

With the "flipped" configuration, could you not use a reverse saw-tooth wave form to flip the image back?

@trollobite1629 3 жыл бұрын

*"...in the good old days..."* You borrowed the local college's copy of _Towers Transistor Selector_

@keithking1985 9 ай бұрын

IV just started learning electronics. And I often wonder what "old-timers" (I'd be an old-timer myself, but you know what I mean) must think about how good (and cheap plus easy excess able) that goods has become these days. And speaking from experience now is a great time to get into electronics because of the amount of videos to learn from.. been absolutely terrible at math held me back from even trying as a kid, but once I started 5/6 years back maths started making perfect sense to me.. so I feel I missed out and am making up for it now.. I bet you have seen some changes over the years 👍😊🇮🇪

@MsFireboy2 Ай бұрын

Kerry quick question? With the Curve Tracer you built. What was the total output of the Triangle Generator circuit? And how much current could the circuit deliver?

@MsFireboy2 26 күн бұрын

Good afternoon. Question? When you designed and built the circuit. In the yet another curve tracer. Why did you input only 2 volts?

@artrock8175 3 жыл бұрын

Great video! Thankyou for sharing! 🙏

@RicardoPenders 3 жыл бұрын

Man, I've made myself a simple curve tracer circuit using a 555 timer, a dual op amp LM358, a single op amp UA741 and a couple PNP and NPN transistors, I have a current mirror using two PNP transistors so I can use the mirrored signal to connect the second scope probe to for measuring the current through the DUT. So, I have a fast square wave coming out the 555 timer and a slower square wave that I get from one side of the dual op amp which I'm using to reset the 555 timer via a NPN transistor and at the same time I have another NPN transistor that I use together with a capacitor and the second op amp to create a stairstep wave that I use to drive the base of the DUT, the collector from the DUT goes to probe one of the scope [Y] and through the current mirror to scope probe two [X]. The circuit works and I see the scope doing its best to show me something that looks a bit like a curve tracer, but something is off and I don't know what exactly and now that I watched this video hearing you talk about the problem we can have that we can't flip the wave or something like that, I'll have to watch it again because I don't understand that particular part, I can't visualize it in my brain before me as I have to be able to do for me to understand what's happening. It's the way I learn and remember it for the rest of my life. I'm making a video about it and I'll upload it here to KZbin as soon as I can, maybe when you see the curve tracer signal on my scope you can tell me what's going wrong, at least that's what I hope.

@KerryWongBlog 3 жыл бұрын

I built a V/I curve tracer a while back (www.kerrywong.com/2013/09/02/yet-another-semiconductor-vi-curve-tracer/) and the results were pretty decent (www.kerrywong.com/2013/09/09/yet-another-semiconductor-vi-curve-tracer-ii/).

@RicardoPenders 3 жыл бұрын

@@KerryWongBlog I watched the video about it which is this video here. The thing is that I'm learning to do it all analog and I have it working, kind of working I think. It's just that I never made anything like this and I don't have a lot of experience with my oscilloscope that's also new for me so I'm not sure that the curve tracer is showing what it supposed to show or not. And I have a digital scope which makes the X/Y trace behave different when compared to an analog scope, especially with this particular mode. All that is complicating things for me figuring this out but I have to work with what I got and I believe when I have it working great and made it completely analog that I have a better understanding how it all works. Which makes it easier for me in the future when I start another project.

@MsFireboy2 3 ай бұрын

Kerry Question are there a few Curve Tracer circuits out there that used a Ramp signal across the Collector Emitter Junctions?

@KerryWongBlog 3 ай бұрын

Not sure if I understood the question. But I had built a curve tracer long time ago: www.kerrywong.com/2013/09/02/yet-another-semiconductor-vi-curve-tracer/ www.kerrywong.com/2013/09/09/yet-another-semiconductor-vi-curve-tracer-ii/ you can hook it up to an oscilloscope.

@MsFireboy2 8 ай бұрын

Question was was the amplitude did you set the stair step into the Base of the transistor under test?

@MsFireboy2 Ай бұрын

Kerry could you or would you demonstrate in a video the Curve Tracer you built titled Yet another curve tracer? Thank you.

@KerryWongBlog Ай бұрын

Well, after the prototyping, I was planning to make the PCB and rebuild it properly, but I never got around to it...

@MsFireboy2 Ай бұрын

@ Ok are you planning on rebuilding it?

@MsFireboy2 2 ай бұрын

On your article Yet Another Curve Tracer article. What frequency did you run the Triangle Generator Circuit at? I calculated it out to be about 288 hertz. One over time.

@KerryWongBlog 2 ай бұрын

Yeah, it's about a couple hundred Hertz. The actual frequency doesn't matter that much. Because the triangular waveform and the staircase signal are essentially free running and not synchronized, I chose a frequency so that the traced curve can be refreshed at a reasonable rate on the scope.

@MsFireboy2 2 ай бұрын

@@KerryWongBlog Thank you. I bread boarded the stair step generator looks fantastic stable which I always try to achieve. Took your advice on the output transistors very nice results. Thanks again.

@IonEnergyElectricalsElectronic 3 ай бұрын

can we test ic, igbt, triac and power electronics components using this?

@MsFireboy2 2 ай бұрын

Kerry built the Triangle wave generator circuit. Of the Schematic Yet Another Curve Tracer I’m getting 1.09 volts output no load. Does this sound about right?

@KerryWongBlog 2 ай бұрын

It's 2V peak-to-peak and it's bi-polar. so if you are measuring against ground then yes 1V is what you should be expecting.

@MsFireboy2 2 ай бұрын

@@KerryWongBlog Thank you.

@nityanandadas5575 Жыл бұрын

Nice video. Whether The Staircase wave form for base current and SAWTOOTH wave should be independent or synchronized? Another point is whether I can use Digital Storage Oscilloscope for this experiment to get the curves? Please. Thanks and Regards

@KerryWongBlog Жыл бұрын

These are two independent signal sources so they are not synchronized. In theory DSOs can plot in XY mode as well but a lot of the cheap ones have very limited refresh rates in XY mode so it may not work well. You will have to try it with your scope.

@nityanandadas5575 Жыл бұрын

@@KerryWongBlog Thanks for your reply. Helpful.

@nityanandadas5575 Жыл бұрын

@@KerryWongBlog Will you please explain why isolated grounds are needed? Thanks N Das from INDIA

@aerofart 3 жыл бұрын

Hi Kerry, new subscriber here. I very much enjoyed this video and look forward to watching more. I’ve been very interested in semiconductor characteristic curves for as long as I can remember. I find transistors (and other amplification mechanisms) fascinating. With all this talk about the characteristic curves of BJT however, the one important question that i haven’t seen addressed is: now that you have your curves, HOW DO YOU USE THEM? Would it be possible for you to do a follow-up video where you set up various scenarios (problems) and a box of different transistors and explain how the IV (and other) curves can be used in a real-world scenario?

@KerryWongBlog 3 жыл бұрын

Much appreciated! Curve tracing is mainly used for analog transistor circuit designs (e.g. for setting the biasing point or Q point, figuring out the dynamic ranges etc). If there is enough interests in this topic I will do a video on it.

@aerofart 3 жыл бұрын

@@KerryWongBlog sounds good. I’m just trying to find an easy(ier) way to get a transistor to do what I want without having to do all the tedious calculations. And also trying to understand when exactly transistors with differing characteristics are used and for what applications. I can think of three (switching, audio, and RF) specialization, but even within those specializations there seem to be many transistors to choose from.

@aerofart 2 жыл бұрын

@Ralph Reilly not trolling, just very eccentric. I have always marveled at electronics, not simply for what they do, but for the underlying science behind it all - it's fascinating to know how things of this world behave, even moreso knowing why!

@gerryjamesedwards1227 Жыл бұрын

@@aerofart You can also use the curves to find closely matched transistors, for building discrete differential amps, for instance.

@MsFireboy2 3 ай бұрын

Kerry thanks for the Curve Tracer Video link. Could you send me a clear Schematic Diagram for your Yet Another Semiconductor V/I Curve Tracer? Thank you.

@KerryWongBlog 3 ай бұрын

If you click on the schematic you should get the full sized schematics.

@MsFireboy2 3 ай бұрын

@@KerryWongBlog Thanks.

@MsFireboy2 3 ай бұрын

@@KerryWongBlog Question are you running the same frequencies on the X And Y parts of the Curve Tracer you built?

@KerryWongBlog 3 ай бұрын

@@MsFireboy2 No, the X and Y clocks are independent and free running.

@MsFireboy2 3 ай бұрын

@@KerryWongBlog Thanks. Quick question where did you purchase the final Transistors?