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cable tester modification

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freddy_uk

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hi,

i have just gone out and got a cable tester from maplins, works like an inductive amplifier, detecting a tone present in the cable. Im detecting tones from 500hz to 3000hz.

I want to take to audio speaker output of this tester and put it through some kind of filter, when a tone between 500hz and 3000hz is detected i want to light an led, the unit is powered by a pp3 battery.

Any suggestions

thanks
freddy
 
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