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555 timer FM transmitter

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555 timer FM transmitter

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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

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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 4 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  

add a comment | 

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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 4 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @ Sunnyskyguy EE75 Thanks!
  $endgroup$
  – Highvoltagemath
  4 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 4 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @ Sunnyskyguy EE75 Thanks!
  $endgroup$
  – Highvoltagemath
  4 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 4 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

$endgroup$

share|improve this answer

answered 4 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

answered 4 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103

answered 4 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

72.3k227103