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This is a low current flasher consumes only a few Micro amperes current and lights a high bright LED day and night for more than one year. This can be used in switch boards, key stand etc to locate them easily. Unlike other LED flashers, it uses the current from the capacitor to light the LED. With a 9 volt battery, the LED flashes more than one year.
The design of the LED night lamp circuit (bedroom light) is similar to that of many commercially available products. However, the light circuit does not use any kind of bulky and noisy stepdown transformers, but a capacitive potential divider is inserted in a simple manner to provide a constant current for driving the light source. Here a high-efficiency, low current blue LED is used as the light source. The design is safe, simple and stable!
Here is a simple USB lamp powered from the USB socket of PC. It uses 5mm high brightWhite LEDs to give ample light to work in the Keyboard if the room light is not sufficient. No PCB is required to make this circuit
Here is a Simple LED Voltmeter to Monitor the charge level in Lead Acid Battery or Tubular battery. The terminal voltage of the battery is indicated through a four level LED indicators.
