Mrthfx

How to prevent z-fighting in OpenSCAD?

Multiple options vs single option UI

I preordered a game on my Xbox while on the home screen of my friend's account. Which of us owns the game?

Could the terminal length of components like resistors be reduced?

Dynamic SOQL query relationship with field visibility for Users

On The Origin of Dissonant Chords

Check if a string is entirely made of the same substring

What is the smallest unit of eos?

"You've called the wrong number" or "You called the wrong number"

Function pointer with named arguments?

How could Tony Stark make this in Endgame?

How to not starve gigantic beasts

Coordinate my way to the name of the (video) game

Aligning equation numbers vertically

Does a large simulator bay have standard public address announcements?

What is the most expensive material in the world that could be used to create Pun-Pun's lute?

What makes accurate emulation of old systems a difficult task?

How do I deal with a coworker that keeps asking to make small superficial changes to a report, and it is seriously triggering my anxiety?

How exactly does Hawking radiation decrease the mass of black holes?

Can I grease a crank spindle/bracket without disassembling the crank set?

Map of water taps to fill bottles

How to display Aura JS Errors Lightning Out

How would 10 generations of living underground change the human body?

A ​Note ​on ​N!

555 timer FM transmitter

Building a UHF FM audio transmitter555 Timer Monostable Mode Self Triggering555 timer as FM transmitter vs. Tank Circuit555 timer digital clockOriginal 555 timer transistor output implementationCan Pulsed DC be used in a radio transmitter?How to improve design of naive MW AM transmitter for lab demoDriving LED with 555 timer and BC639 transistorInverted 555 Monostable Timer With a Sustained InputHow to make 555 timer output fall

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

1

$begingroup$

So online, I found this 555 timer FM modulator circuit. But To make this a working FM transmitter, is all I have to do is attach an antenna to the output modulated signal? Or do I have to also have a series LC resonant circuit tuned to the carrier frequency?

Link: FM Modulator Circuit Using 555 Timer IC

Circuit:

555 radio

share|improve this question

edited 3 hours ago

Greenonline

93821023

asked 4 hours ago

HighvoltagemathHighvoltagemath

63

New contributor

Highvoltagemath is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  If you add a link to the article where you found this we might be able to point out some context that you've missed. Hit the edit button below your question ...
  $endgroup$
  – Transistor
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  I don't think you're going to ever have much luck using a 555 timer as an FM transmitter.
  $endgroup$
  – Hearth
  4 hours ago
  

  
  
  
  

add a comment | 

1

$begingroup$

So online, I found this 555 timer FM modulator circuit. But To make this a working FM transmitter, is all I have to do is attach an antenna to the output modulated signal? Or do I have to also have a series LC resonant circuit tuned to the carrier frequency?

Link: FM Modulator Circuit Using 555 Timer IC

Circuit:

555 radio

share|improve this question

edited 3 hours ago

Greenonline

93821023

asked 4 hours ago

HighvoltagemathHighvoltagemath

63

New contributor

Highvoltagemath is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  If you add a link to the article where you found this we might be able to point out some context that you've missed. Hit the edit button below your question ...
  $endgroup$
  – Transistor
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  I don't think you're going to ever have much luck using a 555 timer as an FM transmitter.
  $endgroup$
  – Hearth
  4 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

So online, I found this 555 timer FM modulator circuit. But To make this a working FM transmitter, is all I have to do is attach an antenna to the output modulated signal? Or do I have to also have a series LC resonant circuit tuned to the carrier frequency?

Link: FM Modulator Circuit Using 555 Timer IC

Circuit:

555 radio

share|improve this question

edited 3 hours ago

Greenonline

93821023

asked 4 hours ago

HighvoltagemathHighvoltagemath

63

New contributor

Highvoltagemath is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this question

edited 3 hours ago

Greenonline

93821023

asked 4 hours ago

HighvoltagemathHighvoltagemath

63

New contributor

Highvoltagemath is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 3 hours ago

Greenonline

93821023

asked 4 hours ago

HighvoltagemathHighvoltagemath

63

New contributor

Highvoltagemath is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 3 hours ago

Greenonline

93821023

edited 3 hours ago

Greenonline

93821023

asked 4 hours ago

HighvoltagemathHighvoltagemath

63

New contributor

Highvoltagemath is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 hours ago

HighvoltagemathHighvoltagemath

63

3 Answers
3

active

oldest

votes

3

$begingroup$

The original article states

The carrier frequency is set using the 5 kΩ potentiometer behaving as a potential divider with one end at Vcc and the other at ground. The frequency of the free running oscillator is set to approximately 455.50 kHz.

This is not in the FM radio band which extends from about 88 to 108 MHz so you will not be able to pick this up on your radio - unless you somehow manage to generate the right harmonics.

The preceding paragraph says

Here is a frequency modulation (FM) circuit that uses a 555 timer in astable mode to generate a sine wave carrier. GCSE students might find it interesting as they are often playing with the 555 timer IC.

GCSE is a UK second level school standard so I suspect that this might be part of a course studying basic electronics and that a matching receiver would be required.

share|improve this answer

answered 4 hours ago

TransistorTransistor

89.8k787193

$endgroup$

add a comment | 

1

$begingroup$

The North America FM band is around 100MHz, which is a couple orders of magnitude higher frequency than a 555 can manage. You would also want a sinusoidal output so as not to splatter harmonics all over the spectrum (at odd integer multiples of the base frequency).

share|improve this answer

answered 4 hours ago

Spehro PefhanySpehro Pefhany

215k5165440

$endgroup$

add a comment | 

1

$begingroup$

The author is confusing you with free running oscillator set to approximately 455.50 kHz which is the down-converted intermediate freq. , or IF frequency used for an AM radio.

FM radio's use 10.7 MHz for the IF filter.

This 555 timer circuit can generate FM square waves as a voltage controlled Astable from 3.3kHz to 4.4kHz but neither useful for AM or FM radios. 555's are never used in radio designs or any serious design for that matter.

Mr. Peter J. Vis appears to have good Windows/Network/Router skills but weak on Electronic design. I would look elsewhere for better basic electronics books such as on my profile.

share|improve this answer

answered 3 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @ Sunnyskyguy EE75 Thanks!
  $endgroup$
  – Highvoltagemath
  3 hours ago
  

  
  
  
  

add a comment | 

Your Answer

StackExchange.ifUsing("editor", function () {
return StackExchange.using("schematics", function () {
StackExchange.schematics.init();
});
}, "cicuitlab");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "135"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

Highvoltagemath is a new contributor. Be nice, and check out our Code of Conduct.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f435637%2f555-timer-fm-transmitter%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

3

$begingroup$

The original article states

The carrier frequency is set using the 5 kΩ potentiometer behaving as a potential divider with one end at Vcc and the other at ground. The frequency of the free running oscillator is set to approximately 455.50 kHz.

This is not in the FM radio band which extends from about 88 to 108 MHz so you will not be able to pick this up on your radio - unless you somehow manage to generate the right harmonics.

The preceding paragraph says

Here is a frequency modulation (FM) circuit that uses a 555 timer in astable mode to generate a sine wave carrier. GCSE students might find it interesting as they are often playing with the 555 timer IC.

GCSE is a UK second level school standard so I suspect that this might be part of a course studying basic electronics and that a matching receiver would be required.

share|improve this answer

answered 4 hours ago

TransistorTransistor

89.8k787193

$endgroup$

add a comment | 

3

$begingroup$

The original article states

The carrier frequency is set using the 5 kΩ potentiometer behaving as a potential divider with one end at Vcc and the other at ground. The frequency of the free running oscillator is set to approximately 455.50 kHz.

This is not in the FM radio band which extends from about 88 to 108 MHz so you will not be able to pick this up on your radio - unless you somehow manage to generate the right harmonics.

The preceding paragraph says

Here is a frequency modulation (FM) circuit that uses a 555 timer in astable mode to generate a sine wave carrier. GCSE students might find it interesting as they are often playing with the 555 timer IC.

GCSE is a UK second level school standard so I suspect that this might be part of a course studying basic electronics and that a matching receiver would be required.

share|improve this answer

answered 4 hours ago

TransistorTransistor

89.8k787193

$endgroup$

add a comment | 

$begingroup$

The original article states

The carrier frequency is set using the 5 kΩ potentiometer behaving as a potential divider with one end at Vcc and the other at ground. The frequency of the free running oscillator is set to approximately 455.50 kHz.

This is not in the FM radio band which extends from about 88 to 108 MHz so you will not be able to pick this up on your radio - unless you somehow manage to generate the right harmonics.

The preceding paragraph says

Here is a frequency modulation (FM) circuit that uses a 555 timer in astable mode to generate a sine wave carrier. GCSE students might find it interesting as they are often playing with the 555 timer IC.

GCSE is a UK second level school standard so I suspect that this might be part of a course studying basic electronics and that a matching receiver would be required.

share|improve this answer

answered 4 hours ago

TransistorTransistor

89.8k787193

$endgroup$

share|improve this answer

answered 4 hours ago

TransistorTransistor

89.8k787193

answered 4 hours ago

TransistorTransistor

89.8k787193

answered 4 hours ago

TransistorTransistor

89.8k787193

1

$begingroup$

The North America FM band is around 100MHz, which is a couple orders of magnitude higher frequency than a 555 can manage. You would also want a sinusoidal output so as not to splatter harmonics all over the spectrum (at odd integer multiples of the base frequency).

share|improve this answer

answered 4 hours ago

Spehro PefhanySpehro Pefhany

215k5165440

$endgroup$

add a comment | 

1

$begingroup$

The North America FM band is around 100MHz, which is a couple orders of magnitude higher frequency than a 555 can manage. You would also want a sinusoidal output so as not to splatter harmonics all over the spectrum (at odd integer multiples of the base frequency).

share|improve this answer

answered 4 hours ago

Spehro PefhanySpehro Pefhany

215k5165440

$endgroup$

add a comment | 

$begingroup$

The North America FM band is around 100MHz, which is a couple orders of magnitude higher frequency than a 555 can manage. You would also want a sinusoidal output so as not to splatter harmonics all over the spectrum (at odd integer multiples of the base frequency).

share|improve this answer

answered 4 hours ago

Spehro PefhanySpehro Pefhany

215k5165440

$endgroup$

share|improve this answer

answered 4 hours ago

Spehro PefhanySpehro Pefhany

215k5165440

answered 4 hours ago

Spehro PefhanySpehro Pefhany

215k5165440

answered 4 hours ago

Spehro PefhanySpehro Pefhany

215k5165440

1

$begingroup$

The author is confusing you with free running oscillator set to approximately 455.50 kHz which is the down-converted intermediate freq. , or IF frequency used for an AM radio.

FM radio's use 10.7 MHz for the IF filter.

This 555 timer circuit can generate FM square waves as a voltage controlled Astable from 3.3kHz to 4.4kHz but neither useful for AM or FM radios. 555's are never used in radio designs or any serious design for that matter.

Mr. Peter J. Vis appears to have good Windows/Network/Router skills but weak on Electronic design. I would look elsewhere for better basic electronics books such as on my profile.

share|improve this answer

answered 3 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @ Sunnyskyguy EE75 Thanks!
  $endgroup$
  – Highvoltagemath
  3 hours ago
  

  
  
  
  

add a comment | 

1

$begingroup$

The author is confusing you with free running oscillator set to approximately 455.50 kHz which is the down-converted intermediate freq. , or IF frequency used for an AM radio.

FM radio's use 10.7 MHz for the IF filter.

This 555 timer circuit can generate FM square waves as a voltage controlled Astable from 3.3kHz to 4.4kHz but neither useful for AM or FM radios. 555's are never used in radio designs or any serious design for that matter.

Mr. Peter J. Vis appears to have good Windows/Network/Router skills but weak on Electronic design. I would look elsewhere for better basic electronics books such as on my profile.

share|improve this answer

answered 3 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @ Sunnyskyguy EE75 Thanks!
  $endgroup$
  – Highvoltagemath
  3 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

The author is confusing you with free running oscillator set to approximately 455.50 kHz which is the down-converted intermediate freq. , or IF frequency used for an AM radio.

FM radio's use 10.7 MHz for the IF filter.

This 555 timer circuit can generate FM square waves as a voltage controlled Astable from 3.3kHz to 4.4kHz but neither useful for AM or FM radios. 555's are never used in radio designs or any serious design for that matter.

Mr. Peter J. Vis appears to have good Windows/Network/Router skills but weak on Electronic design. I would look elsewhere for better basic electronics books such as on my profile.

share|improve this answer

answered 3 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

$endgroup$

share|improve this answer

answered 3 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

answered 3 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

answered 3 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103