You have made a great video... Instructional, good production and good/entertaining commentary! Thank you for your efforts to share and teach us. The comments you put on the schematic are wonderful! You have inspired me to build it! I am off to check my component supplies!
wonderful video. Do you have any suggestions on where to buy or making a clamp on non-contact 3-phase [A-B-C] 2,300 volts AC motor rotation indicator? 😎 Thank you.
Its forming a low pass filter together with the resistor with which it is in parallel. This is used to limit the bandwidth and the noise of the circuit.
Well the most expensive part is the current sensor its self, at arround 5-6 USD, other than that you have the connectors 2-3 USD together (depending on where you get them form), and all other parts another 1-2 USD. If you wish to buy all the parts (in case you can't recycle them from other equipment) I guess you can pull this off below 10 USD.
I may have expressed myself poorly, what I was trying to say is that I use the ACS714 IC which is a Hall effect based sensor, which has part of the circuitry inside the IC giving an output that is a voltage proportional to the current passing trough it, and I use some external amplifier also to condition the voltage to my needs. The datasheet might also help: www.pololu.com/file/0J196/ACS714.pdf
More questions... - During the selection of the Sensor at the vendor, it appeared that the highest bandwidth was desirable. Please explain why. - There are a lot of Hall Effect Sensor characteristics... Operating Point mT, Polarity, etc. Please tell us what characteristics we need, for this particular application, and why they are important. I'm already digging through my component stocks! :-) More questions are highly likely...
Hello t1d100! In this case (the one in the video) the hall sensor measures the magnetic field arround a wire inside the IC, its not a regular sensor that senses an external field. Therefore most characteristics asociated with hall sensors are not relevant. You need a specific type of sensor not very comonly found in practice - most hall sensors you can find are in stepper motors (like in old floppy drives) where the sensor is used to determine the position of the motor. For this application you need a sensor with a current range suited to your needs, and as you said - bandwidth is one of the most important parameters and more is better. BW relates to the highest frequency you can measure - a sensor with 100KHz BW will measure a 100KHz sine wave with typically 3dB attenuation (you will measure half of the signal amplitude). Higher frequencies will be more distorted. What I am trying to say is that signals of frequencies lower than the rated BW will be ok to measure, but not higher. The problem is the Hall sensor its-self, its not capable of working at high frequencies. When I get a chance I will try to make a video to explain how high BW (~10MHz) current probes are built.
@@FesZElectronics Thank you for your reply and the great information. I have found this make/model of HES sensor on ready-made Break-Out-Boards at Adafruit and Sparkfun. At the Chinese markets, too, Ebay and Banggood, but their sensors are likely to be inferior counterfeits. They are inexpensive. But, where is the fun in ready-made? I am glad you explained about the hertz. 20MHz is typical for the MCU crystals that I use, so I look forward to your wide BW design. I have subscribed, so I'll be sure to catch it. Even faster and more amps would be better for me. People should be careful about "Current Sensor" ICs and Break-Out-Boards; many use shunt technology, not HESs, and they will put a burden on the circuit.
@t1d100 Out of curiosity, why do you want to measure the current going to the crystal? usually oscillator circuits have very low current consumption, so the only meaningful measurement would be using a voltage probe to see the signal. In my experience, at least, high bandwidth is most useful in a current probe when analyzing switching supplies - the switching frequency of such supplies can commonly get up to 2MHz nowadays but you can get unwanted harmonics much higher than this. For anything else usually low frequency is enough - measuring the dynamic current consumption of a circuit or load variations. Regarding shunt technology - if the shunt is small enough it will not really influence the circuit (in most cases at least) the main problem is regarding isolation, usually you will need an instrumentation amplifier to not have the shunt referenced to ground, the amplifier may have some input voltage limitations, and then most probably the measurement probe and the circuit will have a common ground; shunt technology is not bad as long as all limitations are known and taken into account
@@FesZElectronics I did not mean to say that I want to measure the current draw of the crystal, but to give you an idea of the BW I generally work in... Mostly PIC18F4550 MCUs and analog circuits... I only have a Texas Instruments PDRV5053PAQLPG HES on-hand. I am not sure it will be appropriate for DC measurements. DS =www.ti.com/lit/ds/symlink/drv5053.pdf. It has less BW, but it might be a good learning tool, if it reads DC. Would you please take a look?
I have discovered that the PDRV5053PAQLPG is a proximity type HES and is not appropriate for your method. However, I can play with it and make a DIY split toroid clamping current probe, while I am waiting to order parts.
These hall effect current sensors are great, but they do have a lot of hysteresis, so not useful for really precise DC measurements, as the zero value will change depending on the last current measured.
The ACS724 does have better specs than the 714 and 723. Breakout boards are on sale at Pololu for $5.55/ea/with coupon/limited quantities. Coupon: www.pololu.com/category/43/specials Second coupon down. Boards: www.pololu.com/category/265/acs724-current-sensor-carriers Read each model's specs; more amps = less sensitivity.
Sure, send me an email at feszelectronics@gmail.com and I will reply with the eagle project. I will give you the updated layout with the correction applied for the OpAmp supply.
@@shahzaibshamim6524 Hello Shamim; in the mean time I added a link in the video description - you can find all files there. If there are any problems, let me know
Honestly this was my first video,I am aware it's far from perfect and I tried improving things since. I made a better sound recording system, I improved the lighting a little, and about talking, I'm not sure... but I will try to work on that also. Thanks for the feedback!
@@FesZElectronics You've come a long way, your mic sounds so much better now! I like your videos, they're honest, unique and within reach. I've learned something from all your videos and t's nice to see you constantly improving. I like the pcb making videos. Every time I see one I catch something new that helps. Well, I like your sim videos too....... Thanks FesZ.
My following videos will include simulations and tube tear-downs, but is there any kind of circuit or device in which you would be especially interested in?
You have made a great video... Instructional, good production and good/entertaining commentary! Thank you for your efforts to share and teach us. The comments you put on the schematic are wonderful! You have inspired me to build it! I am off to check my component supplies!
wonderful video. Do you have any suggestions on where to buy or making a clamp on non-contact 3-phase [A-B-C] 2,300 volts AC motor rotation indicator? 😎 Thank you.
Perfect video!
Thanks.
Why does it have so much noise?
What is the purpose of C4, the 470pF cap in the feedback path of the inverting amplifier? Great video!
Its forming a low pass filter together with the resistor with which it is in parallel. This is used to limit the bandwidth and the noise of the circuit.
@@FesZElectronics thanks!
May have missed it, but how much did this cost in the end?
Well the most expensive part is the current sensor its self, at arround 5-6 USD, other than that you have the connectors 2-3 USD together (depending on where you get them form), and all other parts another 1-2 USD. If you wish to buy all the parts (in case you can't recycle them from other equipment) I guess you can pull this off below 10 USD.
So, a hall effect circuit needs a sensor -- where is it? Or: how do you use the device?
I may have expressed myself poorly, what I was trying to say is that I use the ACS714 IC which is a Hall effect based sensor, which has part of the circuitry inside the IC giving an output that is a voltage proportional to the current passing trough it, and I use some external amplifier also to condition the voltage to my needs. The datasheet might also help: www.pololu.com/file/0J196/ACS714.pdf
More questions...
- During the selection of the Sensor at the vendor, it appeared that the highest bandwidth was desirable. Please explain why.
- There are a lot of Hall Effect Sensor characteristics... Operating Point mT, Polarity, etc. Please tell us what characteristics we need, for this particular application, and why they are important.
I'm already digging through my component stocks! :-) More questions are highly likely...
Hello t1d100!
In this case (the one in the video) the hall sensor measures the magnetic field arround a wire inside the IC, its not a regular sensor that senses an external field. Therefore most characteristics asociated with hall sensors are not relevant. You need a specific type of sensor not very comonly found in practice - most hall sensors you can find are in stepper motors (like in old floppy drives) where the sensor is used to determine the position of the motor.
For this application you need a sensor with a current range suited to your needs, and as you said - bandwidth is one of the most important parameters and more is better. BW relates to the highest frequency you can measure - a sensor with 100KHz BW will measure a 100KHz sine wave with typically 3dB attenuation (you will measure half of the signal amplitude). Higher frequencies will be more distorted. What I am trying to say is that signals of frequencies lower than the rated BW will be ok to measure, but not higher. The problem is the Hall sensor its-self, its not capable of working at high frequencies. When I get a chance I will try to make a video to explain how high BW (~10MHz) current probes are built.
@@FesZElectronics Thank you for your reply and the great information. I have found this make/model of HES sensor on ready-made Break-Out-Boards at Adafruit and Sparkfun. At the Chinese markets, too, Ebay and Banggood, but their sensors are likely to be inferior counterfeits. They are inexpensive. But, where is the fun in ready-made?
I am glad you explained about the hertz. 20MHz is typical for the MCU crystals that I use, so I look forward to your wide BW design. I have subscribed, so I'll be sure to catch it. Even faster and more amps would be better for me.
People should be careful about "Current Sensor" ICs and Break-Out-Boards; many use shunt technology, not HESs, and they will put a burden on the circuit.
@t1d100 Out of curiosity, why do you want to measure the current going to the crystal? usually oscillator circuits have very low current consumption, so the only meaningful measurement would be using a voltage probe to see the signal. In my experience, at least, high bandwidth is most useful in a current probe when analyzing switching supplies - the switching frequency of such supplies can commonly get up to 2MHz nowadays but you can get unwanted harmonics much higher than this. For anything else usually low frequency is enough - measuring the dynamic current consumption of a circuit or load variations.
Regarding shunt technology - if the shunt is small enough it will not really influence the circuit (in most cases at least) the main problem is regarding isolation, usually you will need an instrumentation amplifier to not have the shunt referenced to ground, the amplifier may have some input voltage limitations, and then most probably the measurement probe and the circuit will have a common ground; shunt technology is not bad as long as all limitations are known and taken into account
@@FesZElectronics I did not mean to say that I want to measure the current draw of the crystal, but to give you an idea of the BW I generally work in... Mostly PIC18F4550 MCUs and analog circuits...
I only have a Texas Instruments PDRV5053PAQLPG HES on-hand. I am not sure it will be appropriate for DC measurements. DS =www.ti.com/lit/ds/symlink/drv5053.pdf. It has less BW, but it might be a good learning tool, if it reads DC. Would you please take a look?
I have discovered that the PDRV5053PAQLPG is a proximity type HES and is not appropriate for your method. However, I can play with it and make a DIY split toroid clamping current probe, while I am waiting to order parts.
These hall effect current sensors are great, but they do have a lot of hysteresis, so not useful for really precise DC measurements, as the zero value will change depending on the last current measured.
The ACS724 does have better specs than the 714 and 723. Breakout boards are on sale at Pololu for $5.55/ea/with coupon/limited quantities.
Coupon: www.pololu.com/category/43/specials Second coupon down.
Boards: www.pololu.com/category/265/acs724-current-sensor-carriers Read each model's specs; more amps = less sensitivity.
Sweet.
I have a suggestion for a new video.
Build a clone or equivalent of the HP 547a current tracer or some type of micro current tracing device.
Interesting device! If I understood this correctly, the HP547 is a magnetic field probe. Did you ever work with this device?
@@FesZElectronics no, I never used one but I want to.
How do you make vias?
I add a small wire, usually old THT pins, and solder on both sides. Its quite time consuming, but it works.
@@FesZElectronics I'm using 0.6mm rivets. It's tedious as well...
I think your method is faster since you don't have to cut off any excess afterwards - the wire that I use is always longer than needed
The real question is, what is the bandwidth? DC - ? Hz.
The IC I used - the ACS714 has a bandwidth of 80KHz; but there are other similar IC's that have up to 1MHz (like ACS733)
Gerber files for PCB available ?
Sure, send me an email at feszelectronics@gmail.com and I will reply with the eagle project. I will give you the updated layout with the correction applied for the OpAmp supply.
@@FesZElectronics shahzaibs088@gmail.com
@@shahzaibshamim6524 Hello Shamim; in the mean time I added a link in the video description - you can find all files there. If there are any problems, let me know
Please, talk slower, to be more understandable.
Honestly this was my first video,I am aware it's far from perfect and I tried improving things since. I made a better sound recording system, I improved the lighting a little, and about talking, I'm not sure... but I will try to work on that also. Thanks for the feedback!
@@FesZElectronics You've come a long way, your mic sounds so much better now! I like your videos, they're honest, unique and within reach. I've learned something from all your videos and t's nice to see you constantly improving. I like the pcb making videos. Every time I see one I catch something new that helps. Well, I like your sim videos too....... Thanks FesZ.
My following videos will include simulations and tube tear-downs, but is there any kind of circuit or device in which you would be especially interested in?