Doorbell Memory Circuit

  
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If you re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whether someone rang while you were out. Of course, you can t tell whether it was the visitor you were expecting who dropped by then, but a call to the mobile phone of the person concerned can quickly answer that question. A doorbell memory can also save you the trouble of going to the front door (if you live upstairs) when you think you heard the bell but aren t sure. And if you can t buy one, then of course you can build one yourself! Read on to find out how..
Doorbell Memory  Circuit - schematic




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