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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FM transmitter design?
I stumbled across a relatively simple FM radio transmitter online.
Credit: makezine.com
I wanted to understand how it works (it is called "super simple" on the website), but several hours I have ...
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FM Transmitter oscillation problem
I've been trying to get this simple FM transmitter to work over the past few days and I could use some help in a few areas.
First iteration was on a breadboard with all parts included. The ...
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Are the same type of antennas used for receiving and transmitting?
Short version:
Is the same antenna type used for transmitting as is used for receiving if the frequency is the same?
Long version:
My garage door opener uses 433 MHz to receive signals from the ...
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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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Best practice in transmitting sensor analog signal over longer distances (approx. 100') -- in cost sensitive products for microcontrollers
I'm looking for best practices for transmitting an analog sensor signal over long distances to a microcontroller such as the Arduino running at 3.3v or 5v. Keeping costs low is imperative.
SPI and ...
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What is the advantage of differential Manchester
I can see the advantage of Manchester code over NRZ: you get clock and data in one signal combined. But what does differential Manchester add to that?
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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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FM Transmitter Modulation
I am designing an FM transmitter as a learning experience and for fun, but I am having some difficulty with FM modulation. I am using a VCO with a Colpitts topology and common emitter configuration. ...
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Can someone break down how this receiver works?
I'm having difficulty understand how this receiver works due to its size. It was taken from this site: http://jap.hu/electronic/rf.html. It is on top labled toy car receiver.
The toy car transmitter ...
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Improving the quality of an optical audio transmitter
I wired up a very simple device in which I use an audio signal transformer (EI14) to modulate the intensity of a laser beam (a cheap 650nm, 5mW diode) according to the audio output of my phone. The ...
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Using one RF transmitter to send an On/Off signal to multiple receivers
I want to create a system where I can send an On/Off signal to multiple receivers, to say, tell them to turn on an LED. Would I need to have a transmitter/receiver pair for each LED, or can I just ...
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How can I modify the frequency of a simple 433MHz transmitter module?
How can I change the frequency of a simple RF transmitter?
These are the transmitters in question:
Background Research
On this question s3c says:
To change the ...
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Switching Mixers for LO frequency= 4.25Ghz
I want to upconvert a square pulse of 250 Mhz bandwidth(250Mhz is the value of the first zero of the sinc ) to a center frequency of 4.25 Ghz , so that the spread becomes from 4Ghz to 4.5 Ghz.
...
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How does this FM transmitter work?
I'm an electronics student and I have been trying to understand this FM transmitter diagram (taken from electronicshub.org) for a long time. I had put efforts to learn it by surfing the web but parts ...
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AM modulation stage for small transmitter
I am trying to build an AM radio transmitter. I have built a Colpitts oscillator with a 7 Vpp output and an audio stage with a 1 Vpp output. I am trying to build the amplitude modulation stage I am ...
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555 AM transmitter
I looked on instructables and I found an interesting(at least for me) AM transmitter made with a 555 timer which acts as the oscillator:http://www.instructables.com/id/555-AM-Transmitter/ Is this ...
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How to measure distance from moving object using RFID?
I want to make a project on an anti-collision system using RFID. I'm facing many problems selecting RF reader and tag: the required UHF generator, tags and reader are expensive.
Any suggestions on ...
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FM Radio transmitter and receiver circuits
I'm planning on building a FM transmitter and receiver circuit for an electronics project. I was just wondering if these two circuits would work together. Also would they be suitable for transmitting ...
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How to design RF Matching circuit for Transmitter MCU (BC66F2245)?
I am designing a PCB where i use the Holtek BC66F2245 Transmitter MCU to send data using RF at 433MHz. I'm currently drawing the schematic in Altium and now i've come to the point of designing the ...
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Use Potentiometer to change frequency in FM Radio Transmitter
I know that in most circuits you use a tank circuit consisting of an inductor and variable capacitor in parallel to generate different frequencies like this one. However since most cheap trimmer caps ...
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Need help understanding simple FM transmitter
I made a simple FM transmitter following https://maker.pro/custom/tutorial/how-to-make-an-fm-transmitter and it worked!
Now I need some help to understand how.
My coil is made of 1 mm copper wire has ...
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Limit a radio to a single station
We are organizing a game for students where we are transmitting the daily objectives and hints over from an FM transmitter. Is there a way to limit basic radios to only be able to pick up a certain ...
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Building a telephone spy
I am implementing the following circuit
but I am stuck at one point.
How can we input the wires in IN1 , IN2, OUT1, OUT2? I don't know which wire to insert because there are almost 4 or 5 wires ...
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Please verify tube AM radio transmitter [closed]
I am an electronics hobbyist. I designed this tube AM transmitter circuit. I want to ask you, since it's my first designed circuit, if it will work, and if I can improve it.
I am using a PL500 for the ...
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