All Questions
15 questions
7
votes
1
answer
4k
views
Is it possible to "trace" a hall effect sensor on a PCB?
To my knowledge, a hall effect sensor is just a soft-cored hooped metal (iron?) with some wire wrapped around it a precise number of turns. This surrounds another wire that you wish to measure the ...
6
votes
3
answers
2k
views
Recommended Layout for Parallel Current Sensing Resistors
I'm working with 12V DC systems and high currents (up to ~40A). In order to meet the wattage and price requirements for my design, I'm using two parallel sense resistors. The IC I'm using for sensing ...
- 61
4
votes
2
answers
5k
views
Choosing a Shunt Resistor for Low Current Applications
Is it possible to use a shunt monitor to measure current for low values(10 mA-100mA) and if is it possible, should I use low resistive values like in most of the power circuit applications? I know ...
user86045
2
votes
1
answer
2k
views
Current, Voltage, and Power Sensing for 115 V AC Circuits
I am trying to sense voltage, current, and power with an Arduino (Due) for monitoring and diagnostic applications. To get reasonably good input (better than Kill-A-Watt), I have designed an AC sensing ...
- 173
1
vote
1
answer
186
views
Are 4N35 optocouplers clamped at 22V?
I am trying to detect mains with an ESP32, for that I started testing this circuit:
I bought a 4N35 optocoupler and 110kΩ resistors.
My first test was using 2 resistors in series, so R1 = 220kΩ.
The ...
- 1,256
1
vote
2
answers
852
views
Current sensing with AD623
I want to measure current that flows from a several kΩ load with source voltage sweeps from 0-200V. I want to measure possible energy losses, so I need both low and high side sensing. Setup is ...
user86045
1
vote
1
answer
518
views
how to design a differential op-amp for sensing a ac current?
I tried to design a simple electronic load, but I would like to amplify the the voltage across the sensing resistor with gain of 20. Then I can apply a sine wave reference to have a current between 0-...
- 33
1
vote
1
answer
951
views
Detecting motor stall with lm311
I have 9v DC motor that I want to use to lock a door. Control is achieved using an esp8266 board. The esp8266 also switches the direction of rotation via an H bridge. So far, so good..
Now I want to ...
- 13
1
vote
1
answer
570
views
Can I Use Current Sensing Transformer Instead of Power Transformer
This is a follow-up on this question:
How to Design Arduino Voltage and Current Sensing Shield
Thanks to user bigjosh, I read the article:
http://openenergymonitor.org/emon/buildingblocks/measuring-...
- 173
1
vote
1
answer
1k
views
How does this current monitor circuit works?
Can you please explain how can I analyze and equate its feedback?
I have simulated it in LTspice as follows:
I have tried for 0.5A and Vout is precisely 2, half of above, so it is working, despite ...
- 439
1
vote
1
answer
74
views
Harmonic compensation due to a non-linear load
I am doing a project on harmonic compensation due to non linear loads. My current at the source is non-sinusoidal due to non linear load. The current contains harmonics and i am using ACS712 current ...
0
votes
1
answer
64
views
Verifying electric brake current with opto-isolated feedback
I would like to find a way to sense (or detect) current through an opto-coupler.
This opto is used to power an electromagnetic brake, but depending on the type of brake the current through it can ...
- 111
0
votes
1
answer
686
views
Relay that detects 240VAC and switches 12V DC
I'm wishing to detect the loss of AC power (in this case 240V) and when this event occurs have a 12V DC circuit go to earth. This will trigger an alarm for users to react to situation.
Can anyone ...
0
votes
1
answer
145
views
TA12L-100 current sensor max current
I want to buy this current sensor from eBay. I couldn't find how it works, but I presume it works like the other ones through induction. On many sites it says it has a maximum current of 5 amps, but I'...
- 193
-1
votes
3
answers
254
views
current sensing board/adapter (low current)
I'm trying to find a well designed current sensing board which is intended to be used with an oscilloscope.
The closest thing i found is the ucurrent which is meant for multimeters, low cost ...
- 109