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Electronics => Projects, Designs, and Technical Stuff => Topic started by: lidas on November 08, 2017, 12:07:18 pm

Title: Help me for circut driver
Post by: lidas on November 08, 2017, 12:07:18 pm

Hello Friend,
I'm a hobbysta
i want an eletronic capable of designing a circuit, i need a led driver with ub LT3743 with these features
power supply 6 / 16volt
output 3 / 6v 2 / 4Ah. Better than variable to be able to use different types of LEDs
two buttons
press the button one led turned on 50%
press the button two LEDs turned on at 100%

I just have a card scheme I arrange to do the pcb
are you capable? how much is it?

Thank you

Title: Re: Help me for circut driver
Post by: RES on November 08, 2017, 03:13:52 pm

The easiest way to have 50% with one button, and 100% with a second button is to change R1 / R2 (replace pot) on a 555 timer with duty cycle control (PWM output to PWM input of the LT3743). Check the LT3743 datasheet for what PWM frequency is needed.
http://www.electroschematics.com/wp-content/uploads/2010/07/pulse-generator.gif (http://www.electroschematics.com/wp-content/uploads/2010/07/pulse-generator.gif)
http://www.rfwireless-world.com/images/astable-multivibrator-formula1.jpg (http://www.rfwireless-world.com/images/astable-multivibrator-formula1.jpg)

Title: Re: Help me for circut driver
Post by: lidas on November 08, 2017, 07:09:13 pm

thanks for the answer, but I wanted to make it clear that I am not electronic, i can do a pcb from a project already made, so i'm grateful to you all if i design the project as it should be done
Thank you