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i fear you might be right, anyone got any ideas what i can use in its place need to detect tones all tones between 500hz to 3000hzDo they still make the LM567 tone decoder?
i fear you might be right, anyone got any ideas what i can use in its place need to detect tones all tones between 500hz to 3000hz
i fear you might be right, anyone got any ideas what i can use in its place need to detect tones all tones between 500hz to 3000hz
there is an audio tone present on the cable, between 500 and 3000 hz, when i use my inductive amplifier (tone tester) i think im getting alot of interferance from <500hz, but i haven't got any test equipment so its hard to tell but it sound a low tone if you know what i mean.
my off the cuff research & testing so far consists of this...
i found this video on youtube YouTube - Hearing Test
it has tones on it, when i play these through my headphones, i use this inductive amplifier **broken link removed**
i can clearly hear the tones when i turn up the volume on the pc but in reality the tones are not that loud, i think about 20db, i need to amplify them some how and filter out the tones below 500hz
hope this explains abit more
there is an audio tone present on the cable, between 500 and 3000 hz, when i use my inductive amplifier (tone tester) i think im getting alot of interferance from <500hz, but i haven't got any test equipment so its hard to tell but it sound a low tone if you know what i mean.
my off the cuff research & testing so far consists of this...
i found this video on youtube YouTube - Hearing Test
it has tones on it, when i play these through my headphones, i use this inductive amplifier **broken link removed**
i can clearly hear the tones when i turn up the volume on the pc but in reality the tones are not that loud, i think about 20db, i need to amplify them some how and filter out the tones below 500hz
hope this explains abit more
if the db level of the tone on the cable is so low that noise overtakes, perhaps PLL even may not do much. we must have a way to maintain signal to noise ratio (SNR)
May be the level at the sending end can be up by few db. or the cab;lle pair needs to be checked as to how the interference is coming from?
in applications like telecom, interference comes due to wrong paining of wires(un-pairing). Other wise in balanced working, signal levels upto near ly -38dbm can be handled.
most important TERM used by communication engineers and that need not be explained on a site.thats dbm i know db but not seen dbm before
can you think of anything, its really important i come up with some ideas
thanks
thats dbm i know db but not seen dbm before
can you think of anything, its really important i come up with some ideas
thanks