Category Archives: LED and Light

LED Pilot Light using FET

This is the LED pilot light (or LED indicator) circuit. LEDs (Light Emitting Diode) part are interesting things. They only operate at DC supply within specific tolerances, and generally connected with a current limiting resistor towards the power source. Rather than a resistor, it is possible to use a FET (Field Effect Transistor) like the… Read More »

3V Lamp Brightness Controller

Here’s the3V lamp brightness controller circuit diagram used to control the brightness of the light bulb. You simply use the two AA or AAA battery to make this circuit works. Example usage of this circuit is to adjust the brightness of images for close-up photo shoot with a digital camera. IC1 works to generate 150Hz… Read More »

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