Take a look at LM567 Tone decoder. Regards Horta -----Mensagem original----- De: Tal Dayan Para: PICLIST@MITVMA.MIT.EDU Data: S=E1bado, 15 de Junho de 2002 22:51 Assunto: Re: [EE]: PLL >There is an analog chip that is intended to detect reselected frequency.= LM >something if I recall correctly. If nobody will come with the chip name, let >me know and I will check up on Monday at work. > >Tal > >> -----Original Message----- >> From: pic microcontroller discussion list >> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Edson Brusque (listas) >> Sent: Saturday, June 15, 2002 4:35 PM >> To: PICLIST@MITVMA.MIT.EDU >> Subject: [EE]: PLL >> >> >> Hello, >> >> I'm looking for informations about using PLLs (Phase Locked Loops)= at >> low to mid frequencies (from 20Hz to 50kHz). >> >> I've googled the web, searched National's ANs and just can't >> find how to >> use a 4046 to detect a frequency like Peter L. Peres sugested in >> a reply to >> Dale Botkin about guitar tuners. >> >> Also, other examples would be very usefull, as how to filter a 30k= Hz >> signal from a complex waveform etc. >> >> There's some "PLL Cookbook" on the web? Any usefull application notes? >> >> Thank you, >> >> Brusque >> >> ----------------------------------------------------------------- >> Edson Brusque C.I.Tronics Lighting Designers Ltda >> Research and Development Blumenau - SC - Brazil >> Say NO to HTML mail www.citronics.com.br >> ----------------------------------------------------------------- >> >> -- >> http://www.piclist.com hint: To leave the PICList >> mailto:piclist-unsubscribe-request@mitvma.mit.edu >> >> > >-- >http://www.piclist.com hint: To leave the PICList >mailto:piclist-unsubscribe-request@mitvma.mit.edu > > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads