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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Is it possible to sense a temperature using an infrared LED?
Is it possible to make a remote thermometer using a standard IR LED as a transmitter and an IR receiver diode as a receiver?
The range is about 5 meters. I know there are chips available for this ...
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Can pulsed DC be used in a radio transmitter?
I'm building a small radio transmitter based on a 555 timer.
In my circuit a 555 timer in astable mode is used as an oscillator.
kind of like this instructable about building an AM transmitter.
From ...
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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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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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What makes it hard to build a powerful RF transmitter?
I was looking for a powerful RF transmitter lately but I didn't find many. They are low power (< 0.5W) or expensive.
I have a little understanding of a regular 433MHz transmitter's schematics. It ...
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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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Books/Material for RF transmitter/receiver design [closed]
I am doing my thesis for my BSc in EE. Due to a lack of equipped laboratories in my universities, I cannot do a project in microwave-integrated circuits, as I would have preferred. I am therefore ...
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How to make very low range FM Transmitter?
I am experimenting with building an FM transmitter. I want to make it only have a range of a few meters so I can detect it on my radio at home at a distance of a few meters. The circuit diagram is ...
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USB 3.1 Super Speed Signal Directions
This is a question about the signaling direction of the unidirectional USB 3.1 Super Speed Signals known as RX+/RX- and TX+/TX-.
Context: Imagine you have a standard USB-C cable, and a phone. On one ...
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What is the purpose of the choke inductor coil in this qrp radio transmitter?
After building and testing these circuits, I want to understand the purpose of the choke coil in these qrp trans(ceiver)mitter circuits.
https://www.qsl.net/py2ohh/trx/curumim/curumim.htm
I ...
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AM Radio Transmitter
I have been trying to make an AM transmitter and I found this schematic from a persons college project. I understand what is circled in red but the rest I am struggling with. The part circled in red ...
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Is wireless power transfer by induction at 60Hz possible, or does the frequency need to be changed?
I want to build a wireless power transmitter that works over a very short distance. Can I use my line voltage(120V at 60Hz) through the primary coil to induce voltage into a secondary coil about 1/4" ...
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Tube transmitter tuning
I am trying to tune/tweak/repair this transmitter for a friend of mine. It is oscillating, and it has rf power on the antenna, but it just doesn't seem as "strong" as it should be.
The diagram says ...
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FM transmitter not giving the intended output of 88MHz to 108MHz
I am trying to build an FM transmitter that outputs 88MHz to 108MHz range using Multisim, but the circuit I constructed gives a lower voltage and lower frequency at the output according to the ...
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How to make the HT12E transmit (TE to low) only when one or both buttons are pressed?
I followed this video: https://www.youtube.com/watch?v=-xK0B_bM-yk and made these circuits:
Transmitter:
Receiver:
And they work as I want them to. I have 2 pushbuttons so when one or both of them ...
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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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Make an RF transmitter: classic transistor oscillator or VCO module?
This question is about pros and cons of making an RF transmitter (eg in the FM band) in the classical way (eg. with a "transistor based" oscillator circuit, like this one which is very classic and ...
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How far could I pick up VHF from?
I’m new to electronics but I'm doing my ATPL pilots license soon and am interested in the EM spectrum and in particular, radio waves. I was wondering what factors affect the maximum distance I could ...
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4g transmit from a tv antenna to an indoor antenna
We have a TV antenna on the roof, works on 5-2600 MHz.
Its cable runs from roof to my room, connected to the TV.
I am wondering if I could transmit 4g signal using another antenna, by connecting a ...
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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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How to drive a HFBR-1541 optical transmitter?
I want to drive a HFBR-1541 optical transmitter (see page 7; 60mA output current), and I want the driver to have extended operating temperature range (at least starting from -20 degrees Celsius).
The ...
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Replace internal antenna with external antenna
I'm trying to figure out whether it's worth trying to replace an internal antenna for an external antenna of a uhf transmitter/receiver to get a stronger signal in order to get more distance from them ...
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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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Getting distance measurements from three different sensors
I'm trying to implement a small-scale localization. My goal is to track a toy vehicle on a Tracking Panel that I will design.
I'm going to make an application which receives distance measurements from ...
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WiFi Transmitter/Receiver [closed]
I want to create a small, battery-powered electronic device to detect the presence of AC voltage after a power outage. It would then transmit notifications to that effect.
The two components of the ...
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FM Transmitter Circuit
I'm trying to make a FM transmitter work properly. I built the following circuit :
I can synchronize with 94.8Mhz channel on any FM radio, I know that because the original sound from that radio is ...
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Can a small, simple and portable (button cell powered) RF transmitter be made to send a pulsed or constant 550-1000 kHz signal? [closed]
I'm trying to make a beacon to use with my fishing sonar. It would be attached to the leader of my bait to more easily track its depth and location. A small transmitter and a button cell battery, made ...
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Yet another 807 tube transmitter
I just can't seem to get away from these 807s. Although I am to the point where I might replace them with 6146s.
I built this transmitter with a 6AG7 oscillator, and 2x 807 final amplifier. The ...
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What is the role of L1 and L2 in the following ASK transmitter circuit?
I know almost nothing about how oscillators work. Please explain about the operation of the circuit below (ASK transmitter module), especially the inductors.
Is it possible to replace these two ...
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Will a spark gap transmit a signal an FM receiver can "hear?"
Forgive me if this question is a duplicate, I looked around but did not see anything that quite fit.
The scenario: I found a box of old FM receivers, the kinds used (I think) for assistive listening ...
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What's the purpose of the band-pass filter in an RF transmitter?
What is the purpose of the marked band-pass filter?
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Ideas for lowest power power solution for two wireless devices to acknowledge each others presence periodically
Hi I am working on a super low power solution for two novelty items that are going to be tiny and have to have the lowest power consumption possible.
Basically what I'm trying to pull off is having ...
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Is it possible to transmit a video over a 433 MHz RF module?
Is it possible in any case to transmit a video over a 433 MHz RF module?
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Creating a home made ultrasound transducer
I don't know how ultrasound transducers (transmitters) are made, is it possible to create a home made ultrasound transmitter with a custom specific range 1MHz or more? If it is not, would a 3D ...
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How do multiple transmitters and single receiver work?
I have multiple digital transmitters sending packets to an receiver, and packets from different transmitters may arrive at the same time, how can the receiver differentiate multiple packets at the ...
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Help with a RF receiver circuit
Recently I have been working on a basic RF receiver, but my efforts so far have proved fruitless. I designed the following circuit based of of previous research into the topic.
According to what I ...
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Question about transmitter/receiver
I have built a transmitter/receiver with an antenna and crystal. I am wondering if it is stable.
Here is my transmitter:
simulate this circuit – Schematic created using CircuitLab
Here is my ...
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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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Could multiple transmitters on the same frequency work if phase-locked to GPS? (gedanken)
I've been noodling this concept for a while; it seems to me that if it were actually workable somebody would be doing it already, but I haven't heard of it happening. So where do I go off the rails ...
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PCB8711 Rev. A of Sender 5000 solid-state AM transmitter: schematic symbol
I wonder what the symbol encircled below means, because we're repairing an AM transmitter.
I think the real-life version of that schematic looks like this:
I really wonder what the symbol encircled ...
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I need to build a transmitter/receiver system that can accurately (within 500mm) measure distance between the 2 devices [closed]
A business case has been presented to me and I desperately need advice.
I am searching for technologies capable of providing an approximate (<500mm) distance between a stationary receiver and ...
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Why do we modulate a signal before the transmission? [duplicate]
I have a fundamental question. Why do we modulate a signal before the transmission? What is the obstacle for transmitting a signal in its typical form?
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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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What is the purpose of the NSBC114EDP6 IC on the TX pin? [closed]
I am trying to debug the circuit above. The transmitter pin from the MCU is connected to the NSBC114EDP6's (SMD marking code 7A) input pin 2, and the output from pin 3 is connected to another MCU ...
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Need a simple way of generating/transmitting roughly 2.4 GHz (unmodulated), ideally at over 20 dBm (0.1 W)
Purpose / Problem
The aim is to track (large) insects, similar-ish to the approach in this paper. In my design I have a series of high-gain transmitters that rotate. The insect carries a device that ...
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Increase input frequency circuit
Referring to this website, this circuit tries to replicate the waveform of the input voltage and turn it into a high frequency, I tried to simulate the circuit in LTspice, but the output is weird. May ...
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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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Tube transmitter issues
I'm back working on my friend's 807 tube transmitter. I've had some previous posts on this and I'd like to thank all the people who responded for your help!
I bought an oscilloscope and a dummy load ...
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Ground plane radials not improving monopole design
I have a transmitter setup from my router like shown below. The backplane is made from cardboard and has an RPSMA male wire held up in the middle. It is attached to my router.
Goal: design a monopole ...
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Does an RF receiver constantly consume power?
I'm building a battery operated robotic arm and would like to use a cheap, short distance RF transmitter/receiver kit to trigger it. However I would like to know whether the receiver will constantly ...
