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How else do you think 'Your Mate Dave's' door/fire alarum engine functions? (to follow the pattern you would need an amplifier and some joined up chips doing voice recording/playing). Have slack handful of Chinese jobies too. Cheap, whereas the Toshiba 'trainer package' was not - over 20 years old - so contradicting my policy/opinion/policy that single failure prone high semiconductor count kit has a one score years less ten to live. But that is statistics for you. Do as I say not as my doorbell does.
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David V
Lord Finchley tried to mend the electric light
Himself. It struck him dead and serve him right
It is the duty of the wealthy man
To give employment to the artisan
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