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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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4 votes
3 answers
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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 ...
user2514631's user avatar
3 votes
1 answer
1k views

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 ...
user124726's user avatar
1 vote
4 answers
599 views

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 ...
Ciphergeek's user avatar
1 vote
3 answers
3k views

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 ...
Mathias Rönnlund's user avatar
0 votes
0 answers
58 views

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?
Shafayet Rahat's user avatar
16 votes
10 answers
6k views

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 ...
risingtiger's user avatar
9 votes
3 answers
10k views

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?
amadeus's user avatar
  • 1,020
7 votes
4 answers
2k views

What's the purpose of the band-pass filter in an RF transmitter?

What is the purpose of the marked band-pass filter?
LucasSokol's user avatar
6 votes
2 answers
327 views

Are my power calculations on this MOSFET Power Amplifier accurate?

Thanks to the help of electronics.SE, I've designed my first power amplifier, intended for transmitting CW on 7 MHz. Before I order parts and build it, I'd request a design review. One important note:...
SRobertJames's user avatar
  • 1,135
5 votes
1 answer
6k views

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. ...
Ag565's user avatar
  • 53
4 votes
1 answer
2k views

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 ...
sj755's user avatar
  • 899
3 votes
3 answers
246 views

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 ...
Piotr's user avatar
  • 255
3 votes
1 answer
17k views

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 ...
cwd's user avatar
  • 375
3 votes
2 answers
8k views

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 ...
vanchagreen's user avatar
3 votes
1 answer
373 views

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. ...
gururaj's user avatar
  • 151
1 vote
1 answer
6k views

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 ...
Darth Vader's user avatar
1 vote
3 answers
5k views

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 ...
Daniel Tork's user avatar
  • 1,418
1 vote
2 answers
551 views

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 ...
Riley's user avatar
  • 13
1 vote
2 answers
908 views

How to build a circuit which allows a piezo transducer to act as both a transmitter and receiver

I am a student and am currently working on a project where I require a piezo transducer to act as both a transmitter and receiver. I am finding it difficult to build a circuit where a pulse can be ...
user291514's user avatar
1 vote
1 answer
4k views

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 ...
RD meena's user avatar
1 vote
1 answer
702 views

can i connect two similar antennas to two ends of a cable to to re-transmit the signal received from one end?

Scenario: I've set up two wifi hot spots outside of my house at distance lesser than 20 meters as i don't get any ISP signal inside my house. But the problem is now i get very weak signal in my ...
Prakash GPz's user avatar
0 votes
1 answer
331 views

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 ...
Umer Farooq's user avatar
0 votes
2 answers
291 views

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 ...
JamieHoward's user avatar
0 votes
2 answers
967 views

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 ...
Andy's user avatar
  • 265
0 votes
1 answer
5k views

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 ...
NULL's user avatar
  • 223