I hope that you'll enjoy this video. If you have any question or maybe a improvement just live it in the comment section here. Visit my webpage for more. Also, visit my Pateron site if you would like to help me. Thank you.
I would suggest that anyone who builds this makes sure that get a LINEAR OUTPUT Hall Effect Sensor. Something like the A3114 Hall Effect is a fast-switch and only goes high or low, so it wouldn’t work for measuring linear increases. I tired it and failed. No worries, I’ll get some SS49E or similar Linear Output Sensors. Great job and thanks brotha!
I was looking for a current probe like this not long ago but gave up due to the high prices. This one is quite possibly the ugliest looking probe I've ever seen, but that's OK because it obviously works! Why should I buy a probe costing hundreds of dollars when I can now easily build my own for dirt cheap? I learned something today. Great job, and I look forward to seeing more from you!
Nice video brother! You should regulate the supply voltage because the output of the sensor depends on the supply. And also you have to use two potentiometers, one for zero adjust, another for calibration. Zero adjust is needed because the sensor outputs half of the supply voltage at zero field. We have to get rid of that first
What a wonderful, creative, low cost hack! This is exactly the basis I needed for a non-invasive high current monitor for a battery back up sump pump. Thanks so much for sharing!
Wow, one of the best technical videos I've seen on RU-vid. You clearly have a solid understanding of physics and electronics, cover content at the right pace, include the right video shots and animations. I liked the B-field overlay on the magnetic core, with the X showing current flowing down and the arrows spinning clockwise. I'd love a follow-up video with details on the Hall effect, and a demonstration of what happens if you move the wire around within the ring. I suspect something like Gauss's law says it doesn't matter where the current is inside the ring, but clarification would be great. I'm about to go look it up for myself.
Found it. It's called Ampere's Circuital Law. The line integral of B-field along a loop is proportional to the current it encloses. I had pictured an entire array of Hall-effect sensors inside one of those current clamps, but using a ferrite core to capture the field and force it through a single Hall-effect sensor makes sense. en.wikipedia.org/wiki/Amp%C3%A8re%27s_circuital_law#Explanation
Excellent video! Love the project idea - some AC scope clamps can cost as much as a budget DSO! Great explanation and implementation of cheap, easy to source parts.
"You know nothing John Snow". (thats how i feel when watching some of these aspects in this video.. yeah my mindset is pretty limied when it comes to electronics but I do like my current AC&DC clamp meter 210E. Im such a noob I actually thought these big clamp meters was for batteries and often was puzzled why they didn't open up wider and was supprised when i finally realized you could measure current without toggling physically onto the circuit..) thx for the vid.
Very nice video, but there is still one Question: You said that the LM324 is a bad operational amplifier, why dou you think like that and which one would you recommend ??
LM324 is basically four LM741. and we all know the 741 is an old thing. amazing at the time but way passed and very very slow. a better "general purpose" opamp nowadays would be the TL071 from texas :) very cheap :)
When measuring DC, could it be possible to design a circuit and not use a hall sensor? Maybe something that pulses AC (low voltage of course!) Then design a small circuit that can calculate the difference in current/ resistance in dc? I'm really new to electronics I'm trying to learn schematics, chips & components Etc. I realize the hall sensor is pretty simple. I just want to know if it's possible?
Really great video. Thanks for taking the time to create the project and explain it so thoroughly. By way of improvement, the letter 'u' in the word 'circuit' is not pronounced. Your English is great!
4:53 ...is not a transformer in the classical sense. It's a choke used to reduce/filter back emf noise from the device and prevent it from returning to the mains line ;)
This project is really awesome and yes, I've found out what to do with a bunch of half ferrite cores I got :) . I think that the improvements can be made with the amplifier circuit and the calibration...but you speak of the AD623 in your video on current sensors....can I use the AD623 for all these type of projects related to probes or instrumentation circuits? I'm not that familiar with OPamps.
Hi there. Can't remember for sure. The max freq is given by the max freq of the OPAMP and the Hall sensor. Just check those datasheets. Sorry. Keep up!
Great explanation, however I think schematic is wrong. You show a 9M/10pF in series with scope connector. As scopes have a 1M input impedance this filter has a 10:1 attenuation so maximum voltage at scope is 0.9V not 9V. I would like to see frequency response: You measure rise time of clamp by generating a 100mA current pulse at 1kHz. Easy to do using a 100 ohm resistor in emitter of transistor and drive base with 0 to 1.5V square wave. Collector current should be about 0 to 100mA square wave. (The 1.5V drive is to overcome 0.5V base emitter voltage.)
Hi nice video, what current clamp can you recommend for Fluke unit. Their clamp are expensive and have for 1mV DC = 1Amp DC and 1mV AC = 1Amp AC. I would like to find affordable clamps for Fluke 124. Thank you
Hi. Great explanation of the amp clamp. Can you point to any off-the-shelf component to integrate into the circuit that can measure 10A to 150A linearly and give millivolts as output to be read through an Arduino or any other microcontroller?
i enjoyed the video. the frequency response is very low. did you try to speed it up in any way? perhaps by adding a small cap... maye 100 pF across the input 1K resistor. it may help
In case if we don't want to use BNC connector and want the reading on the LCD _ then if we directly connect the output of the OPAMP to the LCD, will we able to get the display of current ratings on LCD?
Is there a way to make it usable to measure currents up to 70-80 amps or more? Maybe with a switch for high/low amp range? I'm really interested in making one, but i would like to measure more than 9amps! It's an relative easy to understand schematic, really love it!
He's using an amplifier to bump the sensitivity up to 1V/A. You need yours to be less sensitive. You could scale the gain down to ten (he used a gain of 100). Or, you could leave out the amp and see where that gets you. Experiment measuring a known current and see what your sensitivity is.
To improve the amplified signal you could use the same OPAM but in a chain connection, the output from the first OPAM to the input of the second but with smaller scales.
Hi LM324 is currently not available in our area so we used LM358 but the result is kinda sketchy. Can you recommend to us other IC to ampli the result? Thank you.
and also when we try it we got a result of 0.025-0.033 V (without conductor on the magnet) and 0.099-0.106 Voltage (with conductor). Then on our second test we got different result, does the circuit really had approximately 0.025V ? Thank ypi for answering it will be a great help in our project.
Hello I'm student from University Putra Malaysia from Malaysia. May I ask, for DC Current Clamp Meter, is it just hall effect ic and ferrite core only or u need copper coil around the ferrite core?
I am in the middle of building something similar but it is exclusively for measuring AC currents, I am using a self made current transformer with two pair of windings, after building the amplifier circuit and extracting the RMS value in a manner similar to what a non true RMS DMM does I have realized that the self made transformer with toroid core from atx power supply is very non linear and i am still struggling to find a method to resolve this problem.
the 49e hall sensor has a bias voltage of half the power vcc ... means that the hall sensor would output a 2.5 v for a vcc= 5v with NO magnetic field sensed by the sensor ... the potentiometre help to offset that bias voltage ...the inverted configuration help for the gain. in this case 100. witch is too big in my opinion .. a gain of 10 will be more than enough.. another strange thing is the 9v battery that is too big for the sensor. in the end the filter is wrong and not suitable for this ...good work
the 49e hall sensor has a bias voltage of half the power vcc ... means that the hall sensor would output a 2.5 v for a vcc= 5v with NO magnetic field sensed by the sensor ... the potentiometre help to offset that bias voltage ...the inverted configuration help for the gain. in this case 100. witch is too big in my opinion .. a gain of 10 will be more than enough.. another strange thing is the 9v battery that is too big for the sensor. in the end the filter is wrong and not suitable for this ...good work
Waaait. LM358 and LM324 are the same thing! Different packaging, different number of units per package, but same units inside. You can even use the extra units of LM324 to increase either noise and distortion suppression or current handling capability.
Be very careful when using current transformers if you leave the secondary open circuit you can generate very high voltages when there is a current pulse or surge always terminate the secondary with a load resistor or are use back to back senders ect
if your device is working on very low frequency you will get nothing in the output with the ferrite core. so what yr saying is not true ...it depends for what you are using it for ...
@@MunnaKumar-sc7qo and in case if we don't want to use BNC connector and want the reading on the LCD _ then if we directly connect the output of the OPAMP to the LCD, will we able to get the display of current ratings on LCD?
@@apurvakalvade2301 yes, but you must change the gain of op-amp as per you lcd working. If you control by any microcontroller then you must use ADC value range.
