555 timer FM transmitter





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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:



Schematic of FM Modulator Circuit Using 555 Timer IC






555 radio







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  • 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


















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:



Schematic of FM Modulator Circuit Using 555 Timer IC






555 radio







share|improve this question









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














1












1








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:



Schematic of FM Modulator Circuit Using 555 Timer IC






555 radio







share|improve this question









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.







$endgroup$




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:



Schematic of FM Modulator Circuit Using 555 Timer IC






555 radio




555 radio






share|improve this question









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









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




share|improve this question








edited 3 hours ago









Greenonline

93821023




93821023






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asked 4 hours ago









HighvoltagemathHighvoltagemath

63




63




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Highvoltagemath is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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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.






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








  • 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














  • 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








1




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




$begingroup$
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




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




$begingroup$
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










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









$endgroup$





















    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









    $endgroup$





















      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









      $endgroup$













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












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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      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









      $endgroup$


















        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









        $endgroup$
















          3












          3








          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









          $endgroup$



          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












          share|improve this answer



          share|improve this answer










          answered 4 hours ago









          TransistorTransistor

          89.8k787193




          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









              $endgroup$


















                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









                $endgroup$
















                  1












                  1








                  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









                  $endgroup$



                  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












                  share|improve this answer



                  share|improve this answer










                  answered 4 hours ago









                  Spehro PefhanySpehro Pefhany

                  215k5165440




                  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









                      $endgroup$













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
















                      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









                      $endgroup$













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














                      1












                      1








                      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









                      $endgroup$



                      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












                      share|improve this answer



                      share|improve this answer










                      answered 4 hours ago









                      Sunnyskyguy EE75Sunnyskyguy EE75

                      72.3k227103




                      72.3k227103












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


















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
















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




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










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










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