Flashing LED's variable speed. Circuit help appreciated.

Neil's picture

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Joined: Jan 21, 2020

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Flashing LED's variable speed. Circuit help appreciated.
January 23, 2020 - 6:55am

Hi,

 

I would like to make a simple mind machine. 

It will have 6 red LED bulbs.

They flash concurrently and their frequency can be controlled by a variable resistor.

When the resistor is at its lowest setting they should flash at 1Hz, when it is at its highest setting it should be at 15Hz

The LED's need to be as bright as possible but also need to be less than a centimeter from a closed eyelid, so they should not produce significant heat.

I have very little experience with circuit design. I have found a number of flashing LED circuits on the internet but I don't know how to modify them to get the specific frequency range I require.

Any help in designing this project would be appreciated.

 

 

Sourav Gupta's picture

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Joined: Feb 12, 2018

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Did you selected the Led?
January 23, 2020 - 9:20am

I think that can be made using 555 timer IC. But further modifications of smooth dimming and light up can be made using a proper microcontroller.

However, it is also possible using op-amp.

Did you selected the leds?