Why not use some of the low-cost MCUs? Most applications have other things around tone decoder itself, eg. keys, outputs etc... My colegue replaced obsolete tone decoder with philips LPC, which has all neccessary harware on-chip for complete application.
Marko ----- Original Message ----- To: Multiple recipients of list CHIPDIR-L <[EMAIL PROTECTED]> Sent: 11. september 2002 20:23 > Is the NE567 chip still being made? > > I thought about that when I recently built a quick and > dirty single-tone decoder and accidentally burned out a couple of > the ones I have in stock. > > The NE567 is a 8-pin DIP which can be set to pull its > output pin low upon receipt of a tone whose frequency is set by a > RC pair. The lock time and amount of time that the tone has to > be present can also be controlled by a couple of capacitors that > set the output filter and the PLL's low-pass filter. > > The main headaches with the 567's, like all PLL-type > devices are the problems with false triggering and front-end > overload which can make the device either trigger when it > shouldn't or loose lock when it should be triggered. > > My two questions are: Is the NE567 still made? Is there > something better that is as easy to use in a cercuit that is also > in a DIP package? > > There are a number of telephone tone type decoders around > that use SCF technology, but I am looking for decoders that can > be set to a whole range of frequencies depending upon what the > builder of the circuit wants. > > P.S. I got my 567 working and have 3 left, but this made > me get to thinking. > > Martin McCormick WB5AGZ Stillwater, OK > OSU Center for Computing and Information Services Network Operations Group > -- > Author: Martin McCormick > INET: [EMAIL PROTECTED] > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 > San Diego, California -- Public Internet access / Mailing Lists > -------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Author: Marko Pavlin INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
