Re: ZN414 -- Where used?
That one had puzzled me too- it was so often presented as something of a toy/novelty and it wasn't really the era of a manufacturer producing an IC just for the hell of it (though intensely irritating bleeping greetings cards later changed that...).
Could there have been a serious application for something that had minimal power requirements like, say, a 200kHz (as was) carrier monitor reference or a standby LF beacon receiver?
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