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Questions tagged [interference]

Normally related to EMI (see [tag:emc])

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Standards for conducted EMI testing

I have some doubts to interpret the CISPR standards, one of them is in relation to the test environment for EMI conducted (150kHz up to 30MHz). The minimum size indicated for the vertical or ...
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56 views

How to reduce spike in Power Supply and GND (SCR + Ignition Coil)

My circuit: Signal coupled in power supply (3.3V) of STM32F103 during spark: Is there any benefit to using this diode (circled in red) or not (without this diode the snubber circuit will start ...
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14 views

Signal to Interference Ratio in OFDM

I have the following two users that are using two subcarriers in an OFDM system. One user (User 2) is received with a frequency offset due to synchronization problems. The figure below shows the ...
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1answer
54 views

How to conclude the necessity for unbalanced to balanced signal conversion for this scenario?

This is a bit specific system related question about simultaneous data-acquisition for several transducers. Therefore hope you don’t mind for the long intro and the question. It would be too implicit ...
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1answer
36 views

Can there be workaround for opto power supply which is not local with the receiver input?

I'm stuck with an issue.. A 0-5V 33Hz pulse train need to be interfaced with an optocoupler 4N46 before it reaches to a DAQ input. This is need to block common mode EMI which introduces noise at this ...
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50 views

Tesla coil interference with electronics!

I have build a tesla coil with primary of 5 turns and secondary of 1200 turns. Im powering it with a simple slayer exciter circuit but with power bjt, and the hole circuit is powered with 45V. Now the ...
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1answer
434 views

What could be causing this interference and how to eliminate it?

(update: Please also see the major edit at the end) A sensitive electronic equipment Device 1 below is basically composed of a power line EMI filter at the mains entry, an SMPS power supply which ...
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1answer
52 views

Question related to the interference seen at the spectrum analyzer's receiver

I am preparing for the RF course exam. I have an old question on hand that I am trying to solve. Please review my attempt. Question: A simple spectrum analyzer with superheterodyne receiver ...
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53 views

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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0answers
39 views

Ferrite bead to remove interference from microwave and television

Not sure if this is the correct area, but thought I'd get more insight than other exchanges. I have on one wall a microwave, and on the back side of it is the television. When the microwave is turned ...
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0answers
17 views

How does one calculate wifi interference per channel?

If you've ever lived in a dense residential neighborhood, I'm sure you've come across the problem of finding the best channel to put your router on. Assuming there is no other non-wifi noise (a ...
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1answer
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How to connect a switch to a microcontroller in an extremly noisy environment

I'm currently working on redesigning the control circuit of a CNC machine (more specific: an Isel milling cutter). Only the digital part will be of interest, I'll keep the old power electronics (motor ...
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36 views

The effects of magnets near a switch circuit?

I'm comparing my options on how to engineer something, and I'm looking for advice on whether to even continue considering this one particular option. Is the use of magnets of any strength in the ...
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1answer
53 views

Why are inductively coupled RFID systems put in certain frequency bands when there are no EM waves used?

LF - 125 kHz HF - 13.56 MHz Those frequencies refer to the magnetic field that is used to induce a voltage in the transponder. Can the magnetic fields actually interfere with EM waves in the ...
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2answers
1k views

Long wires causing Raspberry Pi to die?

I've been working on a simple project involving a Raspberry pi and some switches. I would never thought I would have any problem for something as simple as a switch, but here I am. The 2 wires from ...
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2answers
54 views

Influence of copper thickness on interference between PCB tracks

Explanation : I have designed a PCB for motor control. On this PCB there is a power part and a logic part. The power part is composed of MOSFETs, MOSFET drivers, hall sensor for current feedback and ...
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1answer
57 views

GSM Interference with Meanwell Switch mode PSU

I am having trouble with interference from a GSM modem and my switch mode PSU. I do not know much about interference and how the radiation patterns works for GSM. Below is an image of the circuit ...
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1answer
29 views

Digital Counter signal oscillation

I've a digital counter (Kubler Codix 908) with integrated 30Hz interference input filter integrated, but sometimes (when the contact that will increment the counter is closed) it counts two pieces... ...
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1answer
76 views

GPS L5C Differential? Max Update Rate(bits/s|Hz)?

The differential GPS chips use L1 and L2C to calculate the ionospheric interference. With the new GPS satellites, the new band L5C is being deployed, and I am wondering about the following things: ...
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1answer
66 views

PC monitor flickers/resets when washer motor switches on or off [closed]

My room is next to our laundry and I've recently got a new PC monitor. I've noticed each time the motor in the washing machine is switched on or off, my monitor flickers/resets. The monitor is 32" but ...
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34 views

magnetometer affected by vertical motion?

I have 2 separate tilt-compensated magnetometer setups. One is an Invensense 9250, the other is a simpler LSM303. All I'm trying to do is compute a tilt-compensated compass heading. I've taken both ...
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1answer
308 views

Electrical noise resets & chattering in relay modules using ESP8266

I am trying to build my own SONOFF like device by using a Wemos D1 mini and associated circuitry. I am facing an issue with electrical noise where whenever switching of the relay causes chattering ...
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1answer
56 views

can a PC parallel port produce interference?

Please forgive me for crossing wires on top of IC's but I wanted to get things done, yet still have no luck. Let me explain the circuit. I created a circuit in which three parallel port data lines ...
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1answer
399 views

Help review my first arduino PCB: What did I do wrong? [closed]

EDIT: After taking all what you guys said into account, I edited the pcb into the following. Changed the FTDI while breaking the ground loops and working on the traces a bit, changed the size of the ...
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1answer
166 views

Transformer vs capacitive vs both coupling to speaker

I have seen various configurations in my lifetime on how an 8-ohm output speaker is connected to amplifier circuits. Currently I'm doing a project using an LM386 amplifier and I capacitor coupled ...
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1answer
32 views

Can a bilateral switch block transmitter interference and can my board still produce great audio?

I made a circuit in which an ISD1760 chip outputs music via an LM386 IC and I like the quality and volume of sound, however, when I run an HM-TRP transmitter on the same circuit board and the ...
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2answers
342 views

Metal detector coil SHIELDING?

Many designs of coils, of metal detectors, are shielded (Faraday shield). Should this be used in a gravity-fed detector (like the sketched one)? What's the shield for? NOTE: The coils are arranged ...
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1answer
40 views

Would any voltage be induced in this scario due magnetic coupling?

Imagine a source with a 100 Ohm source impedance is coupled to an amplifier/receiver which has 1Meg input impedance and the transmission is done by using two parallel wires signal and return |XA| and |...
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2answers
344 views

Shielded cable, to ground or not, in amplifier

I have been looking for an answer on the net about this question but not found it fully answered. The topic has been up here a few times (see links below) as well but I find the answers lacking. My ...
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0answers
36 views

Maximum Bluetooth LE devices near each other

I am planning to put 100+ Ruuvitag beacons(Bluetooth LE tranmistters) in a ~120m2 area. There will be approximately 1 meter distance between devices. I need to get their advertisements at once(each ...
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1answer
37 views

powering 2 DC motors

I have two 2.5A 12V DC motors running fans at high rpms. When I hook up one to my 10A 12V DC power supply it works great. When I hook both up the motors just pulse, turning a revolution or two every ...
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1answer
85 views

PMR446 interferes with small electronics?

Some small electronic devices react to PMR446 adversely temporarily, when exposed to a PMR446 transmitter, during the transmission. Portable DVD player: Green horizontal stripes on screen. Increasing ...
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0answers
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Practical assumptions for accomodating cellular, D2D and M2M devices

Question: Given Assumption 1 in a network model which accommodates device-to-device (D2D) communication within a cellular network in the underlay and overlay, make an assumption to accommodate machine-...
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Addition of Successive-interference cancellation in wireless transmission

I am looking to integrate the Successive-Interference Cancellation (SIC) technique into my system and would like to know if the following would work. Let me first explain the system as \$I_c\$ is ...
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30 views

How can I create common mode interference for this setup?

I have a measurement setup where a battery is coupled to a single-ended data-acquisition board though a coaxial BNC cable. This board is powered and monitored by a laptop PC through a USB cable. The ...
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1answer
51 views

Experimenting interference effects for different measurement systems

This is about for low level signals interference/noise being observed with single ended data acquisition inputs but not with diff inputs. Basically there are three data acquisition boards, where one ...
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127 views

8051 programmer not working when laptop lid removed despite suggestions in comments

UPDATE I took a suggestion of disconnecting my external monitor from my laptop and the results were the same. What I did notice however is that the AT89S52 chip always reports the correct signature ...
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2answers
101 views

Human Interference in Signal Circuit?

I've run across an interesting problem with a device I'm building. It seems that when I put my PCB into its plastic enclosure, I can create some signal simply by tapping the case. What makes this ...
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2answers
92 views

FM radio Interference

Near to my location we have IAF(Indian Air Force - Tambaram) training center is there, While hearing FM radio at a at frequency of 106.4MHZ I can hear the cockpit commands/voices daily when these ...
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2answers
66 views

Is this warning about wireless modules interfering with aircraft systems true?

I see the following warning for Sierra wireless (cellular) modems: Do not operate the Sierra Wireless modem in any aircraft, whether the aircraft is on the ground or in flight. In aircraft, the ...
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1answer
53 views

How to model this scenario/circuit with 50Hz interference?

There is an industrial amplifier for force transducers. It amplifies strain gauge outputs and outputs voltage. Lets call this as a voltage source Vtrans. Its output is around 50 Ohm. I measure it ...
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2answers
126 views

relays interfering each other

simulate this circuit – Schematic created using CircuitLab Hi: I have 3 relays (230V coil, 2 contacts) in a system, all the coils 'returns' are wired together, while hots come from the various ...
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1answer
67 views

How to work out the interface of an LCD?

If I got an LCD, and I didn't know anything about it, and there were no markings on the pins, how would I go about interfacing with it? For example, I got this small (around 2.5") colour display out ...
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77 views

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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1answer
202 views

Audio Player and RF Receiver Interference (no transmission data when audio is playing)

I've been trying to control a MP3 player wirelessly through RF but it seems that once I start to play music the receiver stops carrying data to the MCU. My setup is the following: Receiver: Arduino ...
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2answers
126 views

Can fields generated by an antenna damage an iPhone? [closed]

I am currently attending a radio technology course. We continuously work on radio sets that are sometimes used as manpacks by the Army. In order to learn how to operate them we work in close proximity ...
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4answers
956 views

433 MHz RF noise problems

I know this is kind of a noob question. I am trying to establish a wireless communication between two 8051 microcontrollers using a 433 MHz RF module. But since 433 MHz is a quite noisy frequency, the ...
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1answer
40 views

Mixing high-current and digital logic on same PCB causes interference [closed]

Lots of questions have been asked about mixing analog and digital on the same board and protect analog from digital noise. I have different situation: my analog current is so high that it cause ...
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1answer
39 views

When is an analog signal being produced when listening on a Bluetooth device sourced from Windows [closed]

When troubleshooting a buzzing noise from my Windows laptop while listening on Bluetooth headphones, it made me curious why there was even an analog signal being produced. I only get this high-pitched ...
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1answer
172 views

Common-mode chokes in series

Is it common practice to combine common mode chokes back-to-back in series to eliminate/reduce RF interference in different frequency bands? As a random example, placing this in series with this in ...