Can my $15 DIY AC/DC Current Clamp keep up with a commercial one? || DIY or Buy

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You can get the commercial AC/DC current clamp here (affiliate links):
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DIY solution parts list (affiliate links):
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Capacitors: s.click.aliexpress.com/e/_d7d... s.click.aliexpress.com/e/_dU4...
S49E Hall Effect Sensor: s.click.aliexpress.com/e/_98ld1L
200k Trimmers: s.click.aliexpress.com/e/_AVTh3R
TL082 OpAmp: s.click.aliexpress.com/e/_9iaLp7
BNC connector: s.click.aliexpress.com/e/_AYumOt
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Perfboard: s.click.aliexpress.com/e/_dXx...
In this episode of DIY or Buy we will be having a closer look at my broken AC/DC current clamp which can be also called a current probe. The job of such a current clamp is simple, visualizing the current waveform on an oscilloscope. So in this video I will explain how such a current clamp functions and how we can make a DIY alternative in order to find out whether it makes sense to DIY such a tool or whether we should stick to the commercial solution instead. Let's get started!
Thanks to Brilliant.org for sponsoring this video.
Music:
2011 Lookalike by Bartlebeats
0:00 Why current clamps are awesome
2:04 Intro
3:00 Why not use a current shunt?
3:55 How does an AC current clamp work?
5:17 Measuring a DC current with a current clamp
6:41 Building a DIY AC/DC current clamp
7:26 Building a circuit for the current clamp
9:07 Testing my DIY solution
10:30 Verdict

КОМЕНТАРІ: 396

@adityashukla7849 2 роки тому

I was just trying to understand how can I make a current clamp. And there my German friend just dropped a video! 🤩

@greatscottlab 2 роки тому

Hope you enjoyed it!

@Purple431 2 роки тому

7 likes

@SuperSerNiko97 2 роки тому

Me to! I recently bought an oscilloscope and realized accessories are crazy expansive. DIY is basically the only way

@MsUnderattack 2 роки тому

Same

@rizwanhameed5791 2 роки тому

@@greatscottlab Can we use a commercial AC DC clamp meter as Current probe ? Any Hack

@fdumi93 2 роки тому

You could add a 100nF from pin 3 of the opamp to ground to decouple the offset adjustment voltage, this may take out some of the noise. Also the 1Meg on the output of the opamp will make a low-pass filter together with the capacitance of the coax cable and the oscilloscope input, which could be limiting the bandwidth.

@bashaaksema94 2 роки тому

Agreed

@piotrliszka8481 2 роки тому

I would add a buffer at the output before the coax and in my opinion that would solve the problem with bandwidth.

@pserra2 2 роки тому

You need to be mindful of your amplifier's bandwidth. Depending on your opamp IC, there is a limit on the maximum frequency it can operate at. And also, for such small internal voltages, some EMI shielding and signal traces isolation might be desirable. Furthermore, as @MikrySoft has already said, there is another current clamp design, which uses an active secondary coil. The purpose of this coil is to induce an oposing flux such that the total magnetic flux being measured by the Hall-effect sensor is 0.

@MuhammadHanif-bx4pb 2 роки тому

I agree with closed loop current clamp design, it can provide range beyond hall sensor can handle (since it measure 0 magnetic field). for the frequency respond I think he use cheap Chinese opamp clone which can't handle that amount of frequency. I think improving the design by using class A amp instead since it need precision and not efficiency.

@kelvin1316 2 роки тому

The "buy" clamp had what seemed to be two hall effect sensors as well, does that help with accuracy?

@pioneer1943 2 роки тому

Also, the maximum frequency of an op-amp is often stated at unity gain, or at gain of 1, so the thing you should look out for is the maximum gain-bandwidth product. edit: using a 2 stage opamp amplifier isn't a bad idea. The max frequency should increase by about 60-70%

@Qugfvraceysgvigaivys 2 роки тому

This is exactly right. A gain of 200 with a square-ish wave frequency of ~5kHz is pretty rough for a cheap-o op-amp

@MikrySoft 2 роки тому

There is a second way such current clamp can work, utilizing both the Hall effect sensor and a secondary coil. Circuit drives the secondary coil to cancel out the magnetic flux in the core (as measured by the Hall effect sensors). That way you can get bigger dynamic range, but you need a more sensitive sensor that's linear around zero.

@uwezimmermann5427 2 роки тому

there is even a third way, only using coils: you use one coil as the compensation coil and another one as the probing coil, measuring its inductance and thus the magnetization of the core. But these are not really suitable for AC measurements, unless you make a switch for two different modes of operation.

@VladoT 2 роки тому

There is the reason why the comercial current clamp uses two hall sensors.

@jameswebster8284 Рік тому

@@VladoT

@crimsonhalo13 2 роки тому

I never knew the symbol for magnetic flux was a TIE Fighter. :)

@greatscottlab 2 роки тому

The more you know ;-)

@yeet1337 2 роки тому

More like PHI Fighter ._.

@diegonieto1854 2 роки тому

More like the Green Lantern Symbol lol

@snakezdewiggle6084 2 роки тому

|-0-|

@yamablue1510 2 роки тому

6:43 Best part! 😂

@AshutoshSingh-to9vx 2 роки тому

It's a great video. I'm starting to make my own measurement tools as the college lab is inaccessible due to covid. Thank you greatscott

@greatscottlab 2 роки тому

Glad it was helpful!

@jeffryblackmon4846 2 роки тому

You, Sir, are a very good teacher. Your diagrams are terrific, and with your dialogue, you easily get your lesson across. As a retired electronics tech, I find you are doing a great service. Thanks. I have subscribed.

@juniorjunior7179 2 роки тому

I have to say; I always learn a lot from the videos on your channel, but the most impressive thing is this dedication to making so many drawings and explanations with the pen. Congratulations and thanks for sharing so much information and knowledge. I'm a fan. 🇧🇷

@daveb7999 2 роки тому

Thanks Scott! Now I understand a bit more about how my Hantek CC-65 works. Your videos always help clear things up, it's a nice service that you do by sharing this information ... Thank You!

@gf2e 2 роки тому

This is great. I want to measure the current of 4 or 6 circuits in my RV, and this looks much easier than redoing the wiring to add Inline current sensors.

@jackwilliams2010 2 роки тому

I always wondered why my opamp circuits seemed like garbage. Never made the realization that my breadboard was the cause. Thanks for calling that out!

@-never-gonna-give-you-up- 2 роки тому

The music of ac/dc plays faintly in the distance... Sound of the drums Beating in my heart The thunder of guns Tore me apart You've been Thunderstruck! 🎶 🎵

@kenjihirai5141 2 роки тому

You are really great Scott! I was also thinking about this yesterday and you just made it, awesome!

@greatscottlab 2 роки тому

Glad you liked it!

@artursmihelsons415 2 роки тому

Great video! I created, back in day's, AC current clamp by myself and didn't purchase factory one.. I just take old ferrite core and wind up my own windings and connect across secondary output, one resistor.. Worked as a charm, only problem was, that I didn't cut in half ferrite ring and connection was problematic because that.. 😂 But that DIY was quick and didn't cost anything and was made just for one job..

@christossymA3A2 2 роки тому

@GreatScott! I saw from the datasheet of the opamp you used in the DIY version that it has an f unity of 4 MHz . An op amp with a bigger funity (ad8001 perhaps) would make the diy clamp able to function at higher frequencies ?

@lenslens7379 Рік тому

The frequency is also limited by max frequency of hall sensor

@pacomg_2553 2 роки тому

The AC/DC current clamp you made Rocks XD

@dineshth6711 2 роки тому

Hi Mr.Scott, I am a subcriber of your channel from India. Your UKposts videos are very inspiring and knowledge enhancing. Keeping rocking bro!!!

@greatscottlab 2 роки тому

Thanks, will do!

@terrydaniels9573 2 роки тому

Man, I swear you have access to my Google search history. I've been looking for this exact build on and off for a week.

@chigypt 2 роки тому

The best as always, keep the good work @Great Scott

@prathikprashanth2932 2 роки тому

6:09 you soldered an SMD capacitor to a THT component in air. My mind is blown 🤯!! Also, at 8:20, all you had to do to improve the rail splitter was to buffer the 10k-10k voltage divider (without the electrolytic caps) with an op amp in a unity gain configuration.

@greatscottlab 2 роки тому

But I still think the dual voltage rail was not the culprit. So adding a voltage follower would not have improved much. But of course feel free to try it out.

@martinlabuda117 2 роки тому

Awesome video, this topic I did not expect, but it is still surprising how cheap and effective the diy clamp is.

@piotrliszka8481 2 роки тому

Great Scott, that's a decent circuit. To make it work on higher frequences, solder couple wires more to the spare opamp you have already there! Use it as a buffer, because in current setup you might have create some filter between virtual ground and coax. In my opinion, if its working great at low frequencies, this would be the reason. BTW I have looked for a while for nice inexpensive current clamp and for sure going to build that. Another option for even cheaper way of measuring the current would be to use small value resistor (0,1 ohm for example) and amplify the output with opamps to suitable level. Good for electronics and more accurate. Regards.

@MCsCreations 2 роки тому

Pretty impressive work, dude! Fantastic! 😃 Stay safe and creative there! 🖖😊

@greatscottlab 2 роки тому

Thanks, you too!

@FixTronics 2 роки тому

Great content as always

@greatscottlab 2 роки тому

Glad you enjoyed it

@markclark787 2 роки тому

I always wondered how they worked, thanks

@kikihobbyrepair 2 роки тому

Cool little project. Thanks for sharing with us.

@greatscottlab 2 роки тому

Thanks for watching!

@rayquaza396 2 роки тому

Honestly. Both you and Electroboom are the reason why I got passing grades in my electronics major. Thank you so much! P.S. I'm also german and it's weird talking english to a fellow German guy 😂

@abbyck 2 роки тому

Underrated comment!

@greatscottlab 2 роки тому

Happy to help!

@pedro240380 2 роки тому

Looking at a datasheet of Honeywell SS49E, there's a graph suggesting that this kind of Hall sensor is suitable up to 30 - 40 kHz 😉

@MuhammadHanif-bx4pb 2 роки тому

the bottle neck definitely on the op amp, it just a slow op amp.

@Bhavesh_g20 2 роки тому

Finally you uploaded I have to write 30 pages of electronics assignment till tomorrow I am running low on time But I got time to watch it This 😅

@Bhavesh_g20 2 роки тому

Hope you give me your blessing to do the assignment in little time

@volvo09 2 роки тому

Hahaha, just like me... "Ah, i'll start this the night before".

@greatscottlab 2 роки тому

Good luck to you :-)

@Bhavesh_g20 2 роки тому

Aha I am done thanks :)

@hateeternalmaver 2 роки тому

Loved the "desoldering" job... ;D

@avinashranjan9197 2 роки тому

Hey buddy I just enjoy watching ur videos as i love electronics

@therandomguy7738 2 роки тому

Let's get started can never get old

@miguelrod_qui 2 роки тому

Yours will allways be the best!!!

@greatscottlab 2 роки тому

Thanks mate :-)

@jafinch78 2 роки тому

Thanks for sharing! Literally just commented regarding a few days back on Kerry Wong's latest video where I'll be needing for the hybrid CVT MG's design inspection and performance characterization. Now am even more-so planning to make and appreciate the insight. Wondering if those plates are Metglas, Permalloy, MuMetal or what? Was thinking about just using a cheapo current clamp meter hacked out and I think you went even more cost effectively. Really awesome to watch as always!

@BillySugger1965 2 роки тому

Hmm, okay, 5kHz is no way good enough for investigating switch mode power supply operation. The other problem with current sense resistors is that they have inductance. A more accurate equation for voltage across a sense resistor is V = iR + Ldi/dt, and if the current is changing fast, the voltage signal is useless for observing the current waveform. The hardest part of measuring current accurately is accounting for the change in core characteristics with a gapped core. Rather than break the flux path, it is better to break the current path. Less convenient to be sure, but far more accurate and cheaper than a high quality high bandwidth current probe. The solution I use is an LEM current transducer, with a split supply from a dc-dc converter, all powered from a 12V plug top adapter. I mounted this all in a box with a 2.1mm dc power connector and a BNC for the signal output. Yes I have to break the current path, pass the wire through the sensor and reconnect it, but I get a superb signal with a bandwidth of up to 200kHz with the LA 55-P transducer, with an output resistance calibrated for 10mV per amp. It works REALLY well!

@wernerpeter9706 2 роки тому

I also tried the DIY version a few months ago. My problem was already visible with pure DC. At some point the core became magnetized so that no sensible measurement was possible any more. Either demagnetize or wait a day. I tested various core materials and hall sensors. With some combination the effect was earlier, with others later, but always the same problem with the residual magnetism. I then bought this cheap current clamp. It works perfectly, although it wasn't that cheap anymore ;-)

@russellstephan6844 2 роки тому

I just recently made a signal booster coil for an automotive DC clamp meter. The problem was trying to chase down a parasitic draw. The inexpensive DC clamp meter just didn't have the necessary granularity for mA currents in the 1's an 10's range. For a quickie solution, I created a 10 loop (10x) coil of wire which was placed in-line with the circuit to be measured. The amp clamp was then applied to the 10x coil. The hack allowed me to locate the majority of the parasitic draw. In the back of my mind, though, I was thinking a 100 loop (100x) coil would be nice. Just this week I ordered a spool of 20 gauge magnet wire and wound the 100x version. Works like a charm! Granted, if one has access to electronic bench style tools and equipment, such an effort is a waste of time. But, if one is just limited to a generic amp clamp and multimeter, well, the ability to extend those tools has a pay-off.

@sonyajones 2 роки тому

Great video, sir. Thank you.

@pouncingfoxes 2 роки тому

Great project!

@electronic7979 2 роки тому

Helpful information

@power-max 2 роки тому

I just bought this thing yesterday!

@hismastersvoice2729 2 роки тому

finaly. i was wating alot of time for that video

@greatscottlab 2 роки тому

There you go :-)

@muppetpaster 2 роки тому

Got the same Hantek clamp....It is really really good for its price! Bought mine for 35$

@FantaBH 2 роки тому

quite nice and useful. Thank you.

@casperlegendary9380 2 роки тому

Great Job! Scott

@greatscottlab 2 роки тому

Thanks!

@sams5803 2 роки тому

I love this so much. Do you think you could do a video using parts from an apc ups to make a sine wave inverter?

@bernym4047 Рік тому

An interesting article. Thanks.

@rienkthegamer5422 2 роки тому

Thank you for listening!

@nauhhv5385 2 роки тому

Thanks you for the information

@ScienceLab760 2 роки тому

Great video, maybe the material of core contributed to limit the bandwidth for high frequency, many iron core only works in specific ranges and attenuate in others. Thanks for share

@kenwallace6493 2 роки тому

Wideband AC/DC current probes are hard to do. I bought the ICP5150 from AliExpress and am quite pleased. Not cheap but better than the thousands of $ wanted by Tek, HP, etc.

@danielmurimi9870 2 роки тому

I always like your videos, you are great

@KannadaRhymes1 2 роки тому

Great!! Great Scott 😉

@santarpanhatua9201 2 роки тому

I have learned a lot from this video

@carstenk2552 2 роки тому

Consider buying other solder tips if it takes you one hour for such a small circuit. A small conical tip has a low mass and their for heat capacity and a bad geometry for transfer of heat to the board. I use almost only wedge shaped ones. To reduce thermal stress, I use bigger ones. The higher mass means the solder don't get solid as easy, and I don't have to stay on the point as long or even increase the temperature. The current clamp is a nice idea. I rarely use one at home so I am used to borrow the one from work when I need it.

@MrArpSolina 2 роки тому

I love AC/DC

@andreiciora2765 2 роки тому

The king is back

@greatscottlab 2 роки тому

Oh stop it😊

@andreiciora2765 2 роки тому

@@greatscottlab You deserve it

@Elektronikchannel 2 роки тому

Very good... Thank you guys🙏🙏🙏

@gordonlawrence1448 2 роки тому

I'm pretty sure your issue is caused by four factors. 1 You are using a dual op-amp. The TL082 ideally needs unused inputs tied to ground via a 10k resistor. 2 the GBW for a TL082 is 4MHz which sounds like it should be enough but really is not for anything that has a square wave (a square wave can be thought of as a collection of sine waves all constructively and destructively interfering and some are at radically high frequencies). 3 it's a FET input op-amp. Bipolar would be a better idea due to FET's having a gate charge (I thought you might need reminding of this) which really does make a difference in situations like this. 4 It's a TL082. They are an old design and renowned for distortion in audio circuits. In fact in audio circuits you can be better off using something like a 741 in these cases. Ad that to everything else and you did well to get it up to 5KHz. An OPA228 should boost performance significantly.

@josefonseca9178 2 роки тому

I think it's the hall sensor that is giving you trouble. The one you picked is not recommended for high frequency applications if i am not mistaken. Amazing video anyways! Tho i suspect that, if have money for an oscilloscope, buying a current clamp is not that expansive XD.

@greatscottlab 2 роки тому

The datasheet says 3us respond time which means above 100kHz should be possible. But that was not the case. Not sure if the sensor was the problem.

@stevebabiak6997 2 роки тому

@@greatscottlab 3 microseconds gives us ~ 333KHz. For something like a square wave signal to be reproduced with a reasonable approximation, we would need at least five harmonics IMO, so this device could perform at best to 60KHz. With PWM circuits, the waveform will not be 50/50, and that implies an even lower maximum frequency of operation. Just my $0.02 worth.

@prasannapaithankar7051 2 роки тому

Superb video . Can u make a video upon good books related to electronics

@catchmypoint6756 2 роки тому

I think we have to use a special ferrite core for that Because at higher frequency some cores doesn't demagnetize properly

@viocaia Рік тому

Nice channel, I watch this regulary! Need your expertise with a strange situation.I have a DC clampmeter, Halls sensor type, when I measure a DC current shows me different numbers when I change the clamp orientation..let's say I read +10Amps, if I rotate 180degress shows -12|Amps..shouldn't be the same? like an ampmeter ..really doens't care polarity, it's same result..no?..TY !

@ranaharsh365 2 роки тому

Do frequency response of DIY clamp. From that you can exactly find What's the problem with higher frequencies. It might be wrong chosen IC for Opamp or any other. Replace it & do frequency response again.....Your Keysight oscilloscope must have this feature. Don't forget me when oscilloscope giveaway starts because I also need it😌😁

@severinstahl1938 2 роки тому

Great Video thanks! One comment to the bad AC performance. If I saw it correctly you almost had a Gain of 200 if the 1A current ceated as shown a voltage of 500uV this would decrease your Opamp Bandwith from 4Mhz to 20kHz. (GBP 4MHz Typical) which would decrease the Amplitude of the Harmoics incredible creating potential the bad shapes. Possible solution at least to try it different Opamp with higher bandwidth. May take a look at the one used in the commercial clamp. What do you think?

@Krmpfpks 2 роки тому

I already bought one and payed through my teeth for it, but for my application (mostly audio) I would definitively have used your DIY version.

@vinitsingh8962 2 роки тому

Great video man.

@greatscottlab 2 роки тому

Glad you enjoyed it

@vinitsingh8962 2 роки тому

@@greatscottlab Really, loved your content man. It really inspires young youth like me. Watching you gives me a courage to join this field. That's why right now I am pursuing b.tech in electronics and communication engineering. Great thanks again.👍 You are a hope and inspiration to a lot of people. I want to make myself something great, so that I will be also able to have this glorious mind and instruments like yours. Till now, I am just able to buy mastech mas830l multimeter, that costs around 7us bucks or 500rupees in India and trying very hard to anyhow buy a fluke one with all features. One day I will be able to do that and your videos will keep inspiring us and maybe at that time, we both will become great youtubers.

@peerappel2012 2 роки тому

Apart from choosing a more suitable opamp, the circuit's performance could also easily be increased by using an active railsplitter with an opamp. While the circuit still is very simple and requires minimal components, the output voltage will become more stable. Also adding small decoupling capacitance to the opamp and properly terminating the unused opamp will probably help performance. Anyways interesting topic. It blows my mind how expensive current clamps are while the principle isn't really that complicated... :-)

@kornshadow097 Рік тому

Electronics engineering at its best!

@davidchristianson7493 2 роки тому

Most current probe's I'm familiar with use a 50 ohm output impedance and you have to set the scope to 50 ohms input impedance. You've set yours up for 1 MOHM output impedance. I'm not sure that's the best choice here.

@1kreature 2 роки тому

The SS49E has a frequency response that drops off sharply at 40khz. It probably also uses internal chopper stabilization.

@celsiusswatt6021 3 місяці тому

Few things to check: some of analog sensors have chopper stabilization and thus narrow bandwidth. So make sure that your sensor is not of this type. The SS49E has response time of ~3us, so it should go to 100kHz easily. Your opamp has 4MHz GBW product, so at gain of 200 your corner frequency will be only 20kHz, thus not so good picture. Not sure what was the intent of R4C5? Input voltage divider? I'd rather use 50ohm in series to avoid oscillations to drive a cable, but you will guarantee the frequency linearity. Finally, you have second opamp - why not use it for active virtual ground? The best would drop the gain to ~10 (400kHz BW) and if needed, run wire through the core multiple times to increase conversion gain.

@jameswang9257 2 роки тому

Perhaps next time it's a good idea to make "fork" style DC current clamp ! there're some DC current meters exist came with a "fork" instead of a "clamp" that need to circle around the cable, I'm really curious about how they works! (ex. KEW MATE 2012RA multimeter from Japan company Kyoritsu )

@jacobcleveland1594 2 роки тому

You should do a DIY or Buy of amateur radio! (with the proper disclaimers of course haha)

@ghlscitel6714 2 роки тому

The gain bandwidth product of the op amp is 2~4 MHz. This means that you have a 3dB band worst case 20 kHz. With capacitive cables between sensor and opamp input you even have a lower bandwidth due to the integrating effect. Better check your circuit again. Also, why did you not use your opamp #2 in the IC to perform the virtual ground with it?

@thecatofnineswords 2 роки тому

I'd posit two areas for investigation 1. the voltage rail splitting. As you mentioned, resistor-capacitor network is ugly. I don't know how well it copes with higher frequency demands. I've seen rail splitting ICs for DIY audio devices, which have a couple of op-amps packaged in them. 2. The OpAmp's frequency response curves. The output curves really look like they're being filtered. 2.1 oooooh, the perfboards' traces leading to stray capacitance and other unwanted features. It's highly likely that a designed PCB could bring this excellent proof of concept up to being very functional. Nice work!

@greatscottlab 2 роки тому

Thanks for the feedback :-)

@uwezimmermann5427 2 роки тому

Nice project - but you should have considered using a dual opamp where you feed your voltage-divider into one section which is configured as a voltage follower. Then you can use the output of this opamp as your virtual gnd. Regarding your bandwidth problem: what is the amplification you used for your inverting amplifier section, and have you considered the opamp's gain-bandwidth product? A 1 MHz opamp in a 100x connection can only deliver 10 kHz of bandwidth.

@bmelectronic 2 роки тому

Can it be used as clump meter adapter for DC current? Can it be connected to a multimeter and to "measure" amperes in the area of volts?

@sinlip8247 2 роки тому

In the datasheet may appear de response time of the hall sensor IC. Maybe that is what is caussing that distorsion at higher frequencys.

@greatscottlab 2 роки тому

3us response time. Good enough for higher frequencies.

@MuhammadHanif-bx4pb 2 роки тому

since there's a solenoid built in, why not try to design the closed loop current clamp model?

@JjMn1000 2 роки тому

Very cool video

@jagadishk4513 2 роки тому

Can you measure stepper motor phase current using texas instruments driver and show how decay mode settings affect phase current.

@sersheva 5 місяців тому

If I just want to measure dc current it is possible just making a tip with a 49E sensor and placing the sensor face in parallel with the cable and touching it this assures the magnetic flux pass orthogonally to the sensor having a good current reading. (I think this will work just when you have isolated cables from others). I could avoid the ferrite core and just use a pen with the sensor in the tip.

@goomemode3336 2 роки тому

Current clamps are nice

@dewaldesterhuysen712 2 роки тому

The response time of your hall effect sensor is the problem it is probably in the micro seconds thus it is too slow for higher frequencies

@greatscottlab 2 роки тому

3us according to the datasheet. Should be able to perform than what I measured.

@electroumit 2 роки тому

Thank you.

@Samuel-km5yf 2 роки тому

Where did you get the big AC variable transformer that you use in your videos?

@haseeb7027 2 роки тому

I think that the culprit is the lower frequency response or high recovery time of amplifier ic as well as hall effect sensor...but for this price its acceptable..👍👍👍👍👍

@Torabaito 2 роки тому

I would love to see repair added to the list of diy or buy as in your case where you had a commercial unit, is it worth repairing the unit even if you have to replace most of the circuit.

@marcioaugustoberenguel3286 Рік тому

Hi, great circuit! Does it works with low Dc currents like 10mA? xs!

@sri198904 2 роки тому

What is the BW of the opamp ? Secondly why didnt you just pull the reference of the inverting pin to VCC/2 or VCC/4 instead of creating a virtual gnd ? nice video btw thank you so much !

@mr3748 2 роки тому

That's interesting ( and pretty simple) how DC current sensor works with a Hall effect sensor.... I would love to build one myself, but without a ossiloscope it will be challenging 😂😂😂

@YSPACElabs 2 роки тому

Hantek 2d72 is great

@anonanonkiewicz1921 2 роки тому

DSO138 is even better ;)

@necessaryevil8615 2 роки тому

Maybe you should use compensated probes to do some measurements directly at the sensor (or amplifier) output. Also the sensor could be fake. According to the datasheet, frequency roll off shoud start above 30 kHz, so there ís something to gain. Just my 2 cents! Great project!

@loucinci3922 2 роки тому

interesting. Thanks for sharing.

@greatscottlab 2 роки тому

Thanks for watching!

@diyrobotronics 2 роки тому

Hi Scott sir this is awesome,you should make version 2 where measure value shown on Arduino with LCD display 😌😌

@greatscottlab 2 роки тому

So a DIY oscilloscope? ;-)

@diyrobotronics 2 роки тому

@@greatscottlab yaa😍😍

@Drxxx 2 роки тому

Great channel!!

@greatscottlab 2 роки тому

Thank you!

@arv1ndgr 2 роки тому

Based on your Uni-T AC/DC Clampmeter, I bought it then half a decade back and it's still working great. Do you still have/use it?

@user-ii6vb8ho8p 2 роки тому

I have some much fun with this video

@markrichards5630 2 роки тому

I've got one of these, which work well - it's just the calibration button is a bit like voodoo - sometimes it works and sometimes not. You really have to be aware each time that your "zero" may not be zero.