Questions tagged [interference]
For questions about electromagnetic interference (EMI); see also the [emc] tag.
78
questions with no upvoted or accepted answers
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When are 1:1 baluns worth it?
I am trying to build an antenna to connect to the GOES-16 satellite (downlink at 1690,1MHz, linear polarization) with my SDR. My plans are using a 1m offset parabolic dish with a biquad feed connected ...
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3
votes
1
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93
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Stepper Motor Interference from Metal on Frame or Shaft
I'm working on a project with a stepper motor and am running into an odd interference issue related to metal contact with the motor.
I'm using a StepperOnline Nema23 2.8A (23HS22-2804S) motor with a ...
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2
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0
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450
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HF RFID 13.56MHz Interference from WiFi/BLE 2.45GHz?
If a Wifi/BLE antenna were placed within a multicoil loop antenna for 13.56MHz HF RFID, would there be significant crosstalk/interference?
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Conducted Emissions from a PoE powered equipment according to En55032/CISPR32
I'm seeking clarification on Conducted Emissions measurements for a PoE powered device. I've reviewed both the CISPR32 and CISPR 16-2-3 standards, yet I couldn't find specific guidance on the setup ...
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1
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0
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46
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Mitigating 2.4GHz interference from 0-5V analog signaling line
I am chasing my tail on a project and cannot seem to find a way out of the hole.
I have a small 18mm 40kHz piezo transducer running through a powered precision rectifier+preamp circuit. This tiny ...
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1
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0
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88
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Second shift register 74HC595 with wrong outputs
I have a controlling panel at my wall to control which electrical device is active (because I have only a single 10 A phase and running way to often to the breaker).
The principle is easy: read Input ...
1
vote
0
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147
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IR receiver somewhow being triggered by cell phone screen?
First time asking a question here.
I am curious why the TSOP4838 ir sensor is acting erratically when my Google Pixel 2's screen is facing it.
As you can see from the schematic, I have a 555 arranged ...
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1
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0
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199
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PH 4502 electrical interference EMI when in aquarium
I'm trying to get a regular ph reading in an aquarium.
The sensor works well when the probe is in a small quantity of water(i.e. a glass) but has large variations in larger water quantities (i.e. ...
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1
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0
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274
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Forward and Backward Crosstalk
I have some basic questions about crosstalk. My reference for this question is this website.
This website introduces crosstalk in this way:
Crosstalk is the unwanted coupling of energy between two or ...
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1
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0
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122
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Separating mains power from data lines
I'm an electronics hobbyist who's learning from wiring stuff together and searching the internet if something doesn't work. Hence my electronics knowledge is very patchy.
I recently found out that ...
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1
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1
answer
104
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Bluetooth and Wifi range onboard a boat
On my sailboat the range of wifi and Bluetooth appears to be very much shorter than in my home - I can't figure out why.
ex1:
At home I can stream video with Miracast from my basement to a room ...
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0
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49
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Prevent Reception from an Extended Distance (Beyond Design)
I have a magnetic field that is being induced onto a power line by a transmitter, which is following the length of the power line to the receiver. The receiver communicates via a loosely coupled coil ...
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1
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1
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130
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Where to place RF shield
I'd like to put a pump drive circuit similar to the one shown below on the same PCB that has two I2C devices, a GPS module, seven analog signals, an ESP32 MCU transmitting WiFi via a trace antenna, ...
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0
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74
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Using a switching DC-DC converter in high dynamic range current/voltage sensing
I'm thinking of making a power meter circuit which will have a high-side current-sensing amp (LTC6102), a resistive voltage divider for sensing the voltage, a dual op-amp (OPA2365) as a buffer for the ...
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193
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Electro magnetic interference with Arduino Uno and a portable radio
I'm surprised when I'm working with Arduino Uno, by just sitting beside a portable radio, like when I was powered on both Arduino & Radio and when they are close to each other I got some noise ...
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1
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0
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95
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Trying to find the signal in an AC line
I have a medical office call box/light system that is older probably 20 year old and they moved the main panel that the Drs see to know when there are patients waiting and since they moved it, it is ...
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1
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1
answer
147
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Simulate power of intermodulation products
I would like to predict if in- and out-of-band interference will hurt my ability to read signals in the 902-928MHz spectrum.
I recorded the maximum received interference power from 10MHz to 3GHz ...
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1
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1
answer
107
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Digital signal interfering with analog signal and creating false triggers
I am in need of some help/advice.
To start the problem.
I am trying to install a sound player on a model train table. I currently have 8 sound triggers, the switches on four are within 12 inches ...
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1
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0
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301
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Do I need anything between a microcontroller and a basic FM transmitter to cut out EMI?
Below is my circuit of a basic FM transmitter attached to an output pin of the AT89C2051 micro controller. I haven't tested it and I might decide to connect R1 to the NPN collector instead of to VCC. ...
user116345
1
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0
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159
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Will the following circuit cause EMI-problems?
I'm trying to get a feel for which circuits will have EMI-problems and which won't. To make things a bit more concrete, I've designed a super-simple LED-blinking circuit using the PIC16F1788 micro-...
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606
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Isolation between GSM and GPS antenna
We are doing a prototype for a gps based tracker. We got a problem in placing the GSM and GPS antenna. Both the GSM and GPS antenna are omni-directional antennas. In forums and application notes, the ...
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0
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81
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Common Mode choke for radio interference
Wondering if anyone could guide me in a good direction.
This schematic go top redesigned for better protection, so top half become whats shown.
After that we started to notice that when XL4005 outputs ...
0
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0
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59
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ESP-8266 doesn't boot on particular power supply
I have an ESP-01 board (small board with ESP-8266) that usually works fine, but with one particular power supply, the LED just flashes rapidly and the module doesn't start. I know that these modules ...
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42
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Are small analog signals more or less susceptible to interference with a DC offset applied?
Per the title--when looking at analog instrumentation signals ("AC" for this purpose) traveling over a cable (in the realm of say 1-2Vpp) are those signals more or less likely to be impacted ...
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0
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45
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PIR Sensor Interference When RF Transmitting
I have created a small DIY circuit which sends a signal over 433.92Mhz when a PIR sensor is triggered.
The circuit consists of 4 modules soldered onto stripboard.
Schematic:
Components are:
0.71mm ...
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0
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0
answers
61
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ESP32 shielding inside an inverter
I am thinking about using an ESP32 as a secondary controller for a 12 V DC to 220 V AC inverter to monitor and control overload, low battery, using relays to switch AC output, etc. The inverter will ...
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0
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53
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Pump motor interference with PIC microcontroller
I am building a fermentation chamber for sourdough which has a heating element and a 5v mini-pump for humidity. Both are controller by a PIC16 microcontroller. Without the pump all is well, but as ...
0
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1
answer
122
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Multiple DC/DC or single DC/DC + LDO
My FSAE team and I are developing the electronic boards for the car, like BSPD, TSAL, etc.
So far, we use a 24V battery for low voltage system with a single DC/DC 24V to 5V converter for each board, ...
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0
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0
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71
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How to shield a wireless microphone receiver from hdmi cables running under it?
We have some wireless microphones set up with the receivers in a confined space. After adding some HDMI cables (for streaming purposes) we now have an interference problem.
While the transmitter is ...
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71
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How to eliminate the VFD noise affecting digital sensor reading?
I have a problem getting correct readings from a 5v digital sensor connected to an Arduino Uno board. I get correct reading until I start the VFD that drives a 3-phase motor.
The sensor reading then ...
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0
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1
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277
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Relay Switching Causing Arduino to Crash when Load Attached to Relay
The title pretty much says it all
When we don't have devices attached to the relay (standard 4 relay module board) this doesn't happen. But when there are devices attached this does cause the problem ...
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0
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1
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40
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Interference of RF currents with a combiner
I am trying to understand what happens to 2 RF currents flowing in separate planar waveguides (such as microstrip lines), when combined with a power combiner.
More specifically, will they interfere, ...
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0
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0
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130
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How does an integrating receiver work?
I am reading some papers and in one paper, the working of an integrating receiver is mentioned to remove (periodic) interference from the received signal. The paper explains the working as such:
The ...
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83
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Intersymbol interference on PAM Trasmitter
I would like to simulate on Matlab a PAM signal which, travelling on a time-dispersive communication channel, contains intersymbol interference (ISI).
I have 'built' the transmitter by generating:
8-...
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0
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0
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197
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RF interference on GPIO?
Novice here.
I think I have an RF interference problem with a 3.3v digital device used to control lights via an API over wifi and need some help making sense of it.
I have an esp8266 based device with ...
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RF noob here, help with antenna extension & noise reduction keywords
I have a design restriction. I have 24-bit adcs on the same circuit as a 4g lte module and "i have been told" that the ~250mw (~24db) of the 4g module interferes with adc measurement , i was ...
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36
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What happens when the attenuation between radios in an RF test bed becomes higher than the RF leakage attenuation of the coax cables?
If I have an RF testbed with radios connected to each other via an attenuation matrix, what happens when that attenuation between radios exceeds the rated attenuation of the braided shield coax cable (...
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59
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RF noise filtering chassis or power return?
I need to place some filtering on the IO lines of a DC powered device.
The RF noise is induced or conducted into the chassis of the equipment and also into the interconnecting cables. The frequencies ...
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109
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Help with the design of a RF PCB transmitter
Edited with previous suggestions
I work for a company that builds (redacted for privacy), and a big company lent us a special GPS anti-jamming device, and I am in charge of implementing and testing ...
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45
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Avoid body interference in a parallel plate capacitor
I'm making a parallel plate capacitor. Each plane is 4"x6" and they are separated at about 1cm.
I am using an LC meter to measure the capacitance, and the results agree with the parallel ...
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0
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87
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Can inductors interfere with a BLDC motor?
I'm working on a student project. It involves running a brushless DC motor with 70uH external unshielded inductors on each phase.
Can the inductors, seeing as they generate a magnetic field, somehow ...
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0
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How to stop LED EMI on capacitive touch sensor TTP223
I am trying to make a piece of wood touch sensitive. I have a piece of wood carved with runic letters.
I inserted LED's inside then filled the letters with epoxy resin.
When I touch one I want the ...
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RF line: routing it orthogonal over SPI digital signal lines
SPI will be kept below 1MHz. RF signal is under 434 MHz. Is this crossing fine through the big zero ohm resistor ?
Side question: will the outermost SPI line (it is the chip select one), or any of the ...
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131
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Is it ok to have two stepper motors right next to each other?
Would there be any issues having two nema 23 stepper motors laying right next to each other, facing opposite ways (see image)? 48v, 4amps.
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94
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Basic shielding practice for simple passive audio project in an enclosure?
I'm a tinkerer but not an electrical engineer. I'm constructing a stereo->mono summing box for my stereo (to listen to Beatles LPs properly, natch). I'm using the design & schematic here for ...
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1
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What's the logic inside the formula for the calculation of the maximal envelope modulation amplitude of two temporal interfering electric fields?
Since my question is a bit elaborate, I will first write some details. Thank you all!
I refer to the study conducted by Nir Grossman et al. (2017) about the use of the temporal interfering stimulation ...
user274494
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Do I2C wires and 120W (12V) power wires close together cause trouble?
I'm a beginner with electronics and I'm building my first solar powered robot. I now have a 50cm long (1.6 feet) small pipe through which I want to put four wires; 2 for the power from the solar ...
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1
answer
106
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Weird interference when controlling piezoelectric humidifier
I am trying to build an Arduino controlled piezoelectric humidifier. I am using two humidifier modules which have 5V dc operating voltage(they have usb connectors). When I connect one module to my ...
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0
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Will using a relay for triggering remote send interfering signals?
So I have a remote control with a SMD button I want to trigger. To do so, I need to bridge horizontally a pair of the pins, as shown in blue:
However, when testing this, I connected a long (10cm) ...
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0
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1
answer
282
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Arduino relay module interferece on signal pin (230VAC motor load)
I'm trying to switch a small 230V AC motor using an Arduino Uno, but I'm having same problems due to interference on the relay (so the Arduino itself is not a problem).
Sometimes the module create ...
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