One of the most power-hungry devices in our homes, besides the air conditioner or heater, is our refrigerator and freezer. It’s especially so if the door doesn’t close all the way or the magnetic seal ...

The circuit will provide a beeping sound to alarm the household that the refrigerator door has been opened for more than 20 seconds. 4060 – a 14-bit ripple counter with internal oscillator that has ...

When it comes right down to it, gadgets are supposed to make your life better . Enhance them, in some way. Often times, though, they seem to bring as many problems as they fix. That’s why I appreciate ...

The circuit in Figure 1 is a simpler and safer device than a similar one I recently read about (Reference 1). A few years ago, I built the circuit that this Design Idea describes, and the gadget still ...