LED project - Electronic Circuits Projects Diagrams Free

raphaelriv · 14th March 2008, 05:18 PM

hello all, I'll appreciate any help that you guys can provide me with this small design. I am open to any suggestions, i want to make a text fixture that when you input different exact voltage readings you obtain an visual LED light. For example if you were to input 5 volts exact with a little tolerance a LED will light up .. that's it. I was thinking a simple LED circuit but if the voltage is 4.80 i need another LED to light up. Could i use a transistor to control the LED when only a particular voltage is fed?

Norlin · 14th March 2008, 06:15 PM

look up a voltage divider circuit, you could use a transistor to turn things on at the various voltages then

on1aag · 14th March 2008, 06:27 PM

Hi Raphaelriv,

Try this one, the only limitation is that the voltage drop of
the red led should be lower than the voltage drop of the
green led.

on1aag.

raphaelriv · 14th March 2008, 07:20 PM

thanks guys! great help

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14th March 2008, 05:18 PM	(permalink)
raphaelriv	LED project hello all, I'll appreciate any help that you guys can provide me with this small design. I am open to any suggestions, i want to make a text fixture that when you input different exact voltage readings you obtain an visual LED light. For example if you were to input 5 volts exact with a little tolerance a LED will light up .. that's it. I was thinking a simple LED circuit but if the voltage is 4.80 i need another LED to light up. Could i use a transistor to control the LED when only a particular voltage is fed?

14th March 2008, 06:15 PM	(permalink)
Norlin	look up a voltage divider circuit, you could use a transistor to turn things on at the various voltages then

14th March 2008, 07:20 PM	(permalink)
raphaelriv	re: thanks guys! great help