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Hi, what kind of load are you using after the filter? If your load is too low, the filter will not work as expected. OP-AMP buffer is suitable after the filter. Also have a look to this thread http://www.picbasic.co.uk/forum/show...hlight=dtmf%2A
hope this help
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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