Questions tagged [transmitter]
Questions on a set of equipment used to generate and transmit electromagnetic waves carrying messages or signals, esp. those of radio or television.
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questions with no upvoted or accepted answers
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Tube AM transmitter question
I designed an AM tube transmitter based on a crystal oscillator. Can you please tell me if this would work, or what I could improve?
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Datasheet for Keyes IR Transmitter (KY-005) wanted
Can someone help me find the datasheet for the Keyes IR Transmitter (KY-005)?
I know how the pins work, I just need to figure out its voltage drop and how much current should go through it.
Thanks! :...
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Is it possible to use RF signal wires to let a model car center itself on it using phase differences?
I'm looking for a way to let a model car (1/24 to 1/18) know how centered it is on a road. I thought about using a buried wire in the middle of each lane of the road. Would it be possible to detect ...
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Antenna design for outdoor waterproof sensor
I am designing a low-cost soil moisture sensor with an RF433 radio. I put my sensor in a closed PVC tube for outdoor installation.(SIMILAR TO above image)
Without the tube, I can transmit nearly 300 m ...
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Remote Control Plane Transmitter Question
More so of a rc plane hobbyist, so never messed with the workings of the receivers or controllers. I am looking to help with the situation in Ukraine. Building long range search rc planes as most of ...
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Industrial PT100 temperature transmitter and ESP32 with micropython
I'm building a temperature controller using ESP32s and industrial PT100 temperature transmitters.
The transmitter I'm using is this:
MUR-HS-U
It has selectable temperature ranges and outputs 1-10V ...
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How to create an RS485-compatible line driver with an adjustable slew rate?
I need to make an RS485 compatible line driver, capable of 12Mbit/s with fast slew rate, but with the capability to reduce the slew rate to about 50ns rise/fall time when operating at lower bitrates.
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Why does the overshoot exist when transmitter turns on?
I am implementing power amp. with 16-QAM. Because of issue on power consumption, I am using time division duplex (TDD). By TDD, the power amp. turns off if the carrier wave is not needed and vice ...
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Low latency wireless audio transmitter
I am working on a project that requires low latency wireless point to point audio transmission at short distance using a digital transmission technique (ideally 24bit 96khz audio, 30 metre max) at a ...
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Reverse Engineering a transmitter circuit
This circuit is from a radio transmitter electric gate keyfob. -> http://www.easygates.co.uk/product_info.asp?ProductID=340
I want to make my own keyfob.
How would I go about finding or creating a ...
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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
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Bluetooth receiver from multiple transmitters
I need a bluetooth receiver to receive a signal from few transmitters. There is extremely little information about bluetooth on the internet. Google gives a lot of topics about android and iPhones, ...
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Good compact antenna for FM audio transmitter module?
I've been looking at building a short range FM transmitter using this module, the idea is to create a small module that I can integrate into other projects. I'd prefer having the antenna on the same ...
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Debugging an automotive FM transmitter
Transmitter is a 12V automotive audio-to-FM transmitter unit. Belkin Tunecast F8M066.
Receives both power and audio fine over the cables into the unit as measured on the board. 7.6 MHz crystal is ...
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Battery State Indicator LEDs in Wireless Charging
I am working on a custom wireless charging System. I am using the following ICs
Transmitter IC: https://www.analog.com/media/en/technical-documentation/data-sheets/LTC6992-1-6992-2-6992-3-6992-4.pdf
...
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RF shield mesh rules of thumb
When you place a RF transmitter within a metal enclosure with openings that can be approximated as a mesh, are there any rules of thumb for either letting the signal pass through or get attenuated?
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Can I modify a toy RC transmitter?
I'd like to modify a cheap supermarket RC toy car to go reasonably slower for extended run time and easier control. (would be present to a kid) I have not bought or even selected the toy in question, ...
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Chaotic Highpass Filter Output
I'm trying to build an RF transmitter circuit using LTSpice. Built a diode balanced signal mixer connected to a high pass filter to distinguish high frequency from low frequency. However, I'm kinda ...
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How to flash memory when there is no sector information?
Currently, I am trying to flash WCT1013A. As I see in the datasheet there is no sector information. If I do not know about the sector information how am I going to flash the memory?
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Allow 12v power through when RF transmitter is close
I'm currently working on a project to allow 12v power through when a RF Transmitter is within a 20 foot range and shuts off then the transmitter is out of range, I'm not so concerned about the range ...
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Convolution between bit stream sampled by N number of samples per bit with a channel modeled as low pass filter
I generated a bit stream in MATLAB, from the transmitter to be convoluted by the channel
I use MATLAB function "randi" between 0 & 1, so it generates random vectors of 0s & 1s and ...
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How would I make a wireless pressure switch for turning on and off a flash light?
I want to make a wireless pressure switch for a flash light mounted on an airsoft gun
I have figured out that I would have to use an RF transmitter/receiver like this one:
https://www.amazon.com/3-7-...
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Noob DIY Bluetooth Soldering Question
I need your help to convert my earphone with boom mic to Bluetooth using this transmitter receiver. The problem I am facing is that once connected this device does not use the boom mic rather built in ...
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Ethernet maximum current
Is there a maximum current Ethernet receivers and transmitters need to withstand? I haven't found anything regarding that topic
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Spurious measurements FCC
I was wondering if someone can help me with a project at work. I am very very new into RF.
I work for an EMC/EMI lab and we want to do some spurious emissions testing and establish a test procedure ...
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How do I wire five pressure transmitters at the same voltage into a DAQ?
I want to collect pressure readings using 5 analog pressure sensors powered by a battery and collected with a DAQ. My sensors require 10 - 36 VDC and draw 38 mA max with 4 - 20 mA output. My battery ...
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Impedance matching in Transmitter Circuit
Consider the FM transmitter circuit from here (https://eeeproject.com/fm-transmitter-circuit/) with circuit diagram
In this question (Antenna in Transmission & Receiver circuits) I was going to ...
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Help me identify this component in an RF transmitter
This is from a 2-channel RF Transmitter FlySky FS-GT2. I think the antenna's wire should be soldered onto this RF transmitter PCB, flat silver component, however, I do not know where to solder because ...
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How does pulser-receiver circuit work
I want to set up an experiment exactly as given in this data sheet for the T/R switch that I recently bought (the MD0101):
Every pulser receiver circuit that I’ve found neglects to address what ...
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RF help, difference between using 12V and 5V as power supply voltage
I am currently looking into building a custom RF transmitter. The commercial ones built for Arduinos usually operate at 5V. I was also looking into some RF remotes, and found that they usually use 12V....
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Can 4-20mA transmitters send through a 1kOhm resistor?
I have a 4-20mA sensor at work and I wonder if it's possible if a 4-20mA transmitters send through a 1kOhm resistor?
I guy I talked to said that 4-20mA normaly can't send through 1kOhm because it's to ...
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Can't transmit UART signal from Circuit Playground Express to Raspberry Pi witth 433MHz rf link kit
I'm a noob on electronics and I've been trying to send data from a Circuit Playground Express to a Raspberry Pi with a 433MHz rf link kit.
I followed a Rasperry Pi tutorial with the rpi_rf.py library ...
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Is there any applications for short data transmission?
In some applications like IoT,
the transmitter turns off for power saving when the transmission is not needed.
I'm not sure but I heard that:
when the transmitter is on, the data length - in time - ...
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Need 100base-tx/1000BASE‑TX front end analog scheme
Need 100base-tx/1000BASE‑TX front end analog circuitry, if possible with explanations. I've been searching for a while already but no success. There are only bluffy peices of information. Is it ...
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Double Sideband Suppressed Carrier modulator List
I am using ring modulator for DSB-SC am modulation in a transmitter circuit. Can anyone please tell me about more DSB SC modulator for am modulation? I want to know which one to use where?
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Calculating link budget
I was reading and found that there are different ways to calculate "link budget" and I want to know which one is correct because they are confusing to me.
For example, some sources state ...
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Which 433MHz transmitter module can be used for battery operated wireless communication having vey low current consumption (less than 5mA)
Im designing a wireless water level controller. The WLC detects water between overhead and underground tank. The transmitter will be situated at each of the tanks. After water level sensing , the ...
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pulse transmitter operation
I'm trying to get a better understanding of how this 1.5v pulsing transmitter works. I found it on Youtube and modeled it up with some success.
https://www.youtube.com/watch?v=aLS9DsF2ilg
The ...
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Fast Ethernet transmitter structure
Does anyone knows internal structure of a typical Fast Ethernet 100BASE-TX transmitter?
I wonder how MLT-3 voltage levels are formed and what can cause abnormal voltage levels at the PHY output?
...
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RFID spoofer with extended range
I have recently found this tutorial online about making a simple RFID spoofer, using only Arduino, used paper roll, coil wire and some passive components. I thought it was pretty neat and decided to ...
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ensuring transducer (transmitter) and receiver polarity
I am trying to implement a simple phased array of 7 transmitters rated 40 kHz. I have a few receivers to measure the acoustic field generated to validate if it works. What is a simple way to measure ...
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Rf Module Receiver With Pt2272 always gets signal
I am just trying to on and of an led with rf module. I have tried lots of module but my works end up with same result. When I feed my receiver, with led connected to data out, it always powers the ...
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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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Weird waveforms for a transmitter circuit
My book about digital logics ("Digital systems" of Ronald Tocci) provides a waveform which seems illogical to me about a transmitter circuit. This is the diagram of the circuit:
The inputs for the ...
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Private star network topology on Sub-1GHz
I have a project which there is a need to be implemented many sensor nodes in a star network topology. One collector-gateway and multiple transmitters.
The farthest sensor node from the "collector-...
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Capacitors and resistors shown as OPEN and SHORT in Schematics design
I am designing a wireless power Transmitter circuit and mostly following this datasheet for Wireless transmitter IC :-
http://rohmfs.rohm.com/en/products/databook/datasheet/ic/power/...
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Phase modulation in the polar transmitter
In the polar transmitter, after the I and Q signals are converted to amplitude and phase, where the phase is in the range of -pi to pi, the phase is further differenciated to obtain the change in ...
user61665
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Transmitter design methods using 0201 SMD
I have some experience designing an IOT transmitter (315MHz/345MHz/433MHz) using 0603 SMD parts, but am considering building a transmitter for production using 0201 parts. My question is, what is a ...
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Adjusting 300Mhz FM transmitter values for max legal power/range in canada
I read a law for canada and it states:
Industry Canada permits transmitters that have an output lower than 100 µV/m at 30 meters (approximately 1 microwatt output).
Now what fools me are these ...
user143136
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Fm tone transmitter with enable
I'm trying to make a tone transmitter that can transmit a tone at least one hundred feet in clear sight to any standard radio on a frequency where no one is broadcasting. I understand that the values ...
user116345