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| Created | July 26, 2012 |
| Last modified | August 25, 2012 |
| Tags | No tags. |
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A public address system has two inputs, one from a car radio/CD player, and one from a microphone. To make announcements, the radio/CD player has to be muted, the announcement made, and then the radio/CD has to be un-muted.
This was done manually. I was asked to implement a circuit to do this automatically. The prototype has worked and I am now making six copies.
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