Alternative version of the popular circuit, 3V battery supply – Still operating at 1.3V The main purpose of this design was to obviate a small defect of the very popular Fridge Door Alarm circuit, ...
It won't work. No matter how hard you look at your fridge, you won't be able to tell what's inside unless open the door. Unless of course you're at the Consumer Electronics Show and you're standing in ...
Not properly closing a refrigerator door will no doubt invite huge electricity bills. This gadget is an alert device that beeps if you leave the refrigerator door open for more than 20 seconds. When ...
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