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tijoseymathew
Joined: 13 May 2007
Posts: 56
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 14 Feb 2008 18:53 single frequency detectors |
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hi
i want a circuit that will detect wheter the incomming signal is a given frequency say 1kHz. It has to give a logic high for a 1kHz signal and a logic low for all other signals.
Any ideas ??
What are these circuits known as ?
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laktronics
Joined: 06 Jan 2007
Posts: 833
Helped: 137
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| 14 Feb 2008 19:18 Re: single frequency detectors |
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Hi,
Use a tone detector IC 567. Please study the application note and let me know if you have any problem.
Regards,
Laktronics
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KMoffett
Joined: 11 Feb 2008
Posts: 42
Helped: 5
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| 14 Feb 2008 19:23 Re: single frequency detectors |
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LM567 Tone Decoder
Datasheet
http://cache.national.com/ds/LM/LM567.pdf
Obsolete, but still available:
Mouser Electronics:
http://www.mouser.com/Search/Refine.aspx?Ntt=*LM567*&N=1323038&Ntx=mode%2bmatchall&Ns=P_SField&OriginalKeyword=LM567&Ntk=Mouser_Wildcards
Digikey Electronics:
http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&keywords=LM567&x=0&y=0
Ken
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manish12
Joined: 21 Nov 2006
Posts: 954
Helped: 28
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| 14 Feb 2008 19:33 Re: single frequency detectors |
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| i agree with KMoffett and laktronics "PLL"
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FvM
Joined: 22 Jan 2008
Posts: 2487
Helped: 409
Location: Bochum, Germany
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| 14 Feb 2008 22:07 Re: single frequency detectors |
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Hello,
LM567C is an active National product, available in DIP8 and SO8, as you like. Cause this is an unique device, it's very unlikey to be discontinued. It's also very versatile, you can use it e.g. for a simple AC reflection light barrier. Always first choice for a tone decoder.
Regards,
Frank
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tijoseymathew
Joined: 13 May 2007
Posts: 56
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| 15 Feb 2008 3:17 single frequency detectors |
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using an ic is an option . but can i do it discreetely ??
and in my part of the world we dont get many ic's and i doubt if i would be able to get the 567.
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wonbef
Joined: 13 Oct 2004
Posts: 191
Helped: 3
Location: Nanshan, Shenzhen
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| 02 Jul 2008 4:18 single frequency detectors |
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| you can try to use LMC567 tone decoder. it is fabricated in CMOS tech.
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viperpaki007
Joined: 02 Jul 2008
Posts: 39
Helped: 1
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| 03 Jul 2008 11:16 Re: single frequency detectors |
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You can use XR2211 for this ......
Added after 9 minutes:
here is a sample circuit for XR2211 designed for 15KHz and 30KHz marak and space frequencies.....you will have to calculate the component values for 1KHz from the equations in the datasheet.....
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