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Harvest energy from the USB port of your Laptop or PC to light an LED lamp. It is useful as an Emergency lamp in the event of a power failure or it can help you to use the Key pad in night without disturbing the sleep of others. It is too simple and easy to make it. The USB.2 .0 port available in all laptops and PC gives 5 Volt DC and 200-300 milli ampere current. It is enough to light a High power 1 watt LED. Just plug the light in the USB port and enjoy its light. Cool! it is good enough to read a book also. In the market its costs Rs. 300 and you can make it for just Rs.10.
Continue reading “USB Light. Home Utility Circuit 30”
This circuit generates an alarm when the Mains power fails. It can be used as a Lift Alert so that the technician can immediately attend the stopped Lift. It is also helpful to know the power failure in labs where many instruments are switched on continuously.
Continue reading “Power Failure Alarm. Home Utility Circuit 29”
This is a simple 10 Watts LED light you can easily make. It will help you to check the engine, battery terminals or other parts of Car during night. It will act as an efficient high intensity Torch light. It is also useful to check the inverter and its battery usually placed in low light areas. By hooking the clips in the battery, the light will turn on. If you fix a Magnet with it, you can stick the lamp to the vehicle’s body so that your hands will be free to do work. Let us make it. Its cost is Rs.50 only.
Continue reading “Car Light. Home Utility Circuit 28”
This Homemade Power supply is useful for the Electronics hobbyists and service persons to test and troubleshoot the circuits. It gives six stage well regulated output power with a current of 800 mA. Its construction is “Open type” as it is home made. You can make it like a professional power supply by fixing inside a box with connectors for tapping the output.
Continue reading “Home Made Power Supply. Home Utility Circuit 27”