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HELP with a simple circuit to fade in a LED

Discussion in 'LEDs and Optoelectronics' started by lefam, Dec 2, 2010.

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  1. lefam


    Nov 18, 2010
    Hi guys!

    I am pretty new to electronics. I have just designed a circuit that turns on a LED when you press a tactile switch and fades out the LED when you open the switch.

    Can you help me designing a circuit that fades in a LED when a switch is closed? Please something simple (in preference a RC circuit).

    Thank you
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Please show us the circuit you have designed (as a schematic).

    I am presuming you have a capacitor that is charged and then discharges through a resistor and a LED.

    Putting the capacitor, the resistor, and the LED in series will do pretty much what you ask, but you also need to provide a way to discharge the capacitor. But I am makinf assumprions about your original circuit that may not be correct.
  3. lefam


    Nov 18, 2010
    Please forget the circuit that fades out the LED.

    I want to build from scratch a circuit that fades in a LED. The circuit should not have anything to do with the fade out circuit.

    The circuit should contain a tactile switch (push to make switch). When the switch is pushed it should fade in the LED. I think the capacitor would be discharged when the switch is opened.

    I have attached the LED fade out circuit schematics. Can you recommend me a nice program that draws schematics?

    Attached Files:

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