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Showing content with the highest reputation on 23/04/19 in all areas
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they wrote to every household in the UK to inform them of a potential fire risk in their external sounder, which resulted every alarm co. being asked by loads of worried customers if the completely different box was going to burn them to death....1 point
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Typical driver for a piezo. You'll find many examples on-line. The waveform is probably a warble or the like. I'd suggest getting a copy of Horowitz & Hill 'the art of electronics' it's an excellent reference.1 point