Hi, i know nothing at all about transistors and that chip. the only electrical education i have is basic physics, so i only know how to calculate basic stuff, and build basic led circuits, so im very confused about how this fader circuit works.
I'm a 2nd year architecture student in chicago, and after reading this site about making led circuits, i decided to light one of my projects with leds (1st year 2nd semester. but i only made a very simple circuit, which anyone with a little knowledge can make.
here are some pictures.
theres an on off switch on the lower right. the current flows from the batteries to the switch, and then to resistors on the lower left, and up to a parallel circuit of 5 red LEDs, and then back to the batteries. there are mirrors underneath to help reflect the lights.
could someone help me understand the fader circuit diagram? how does it work? what does the chip do? i tried looking at that explanation link but it makes no sense to me. what does the transistor do? which part of the circuit actually controls fading? what causes electricity to stop flowing to the capacitor and make it drain to cause the fading? what makes it charge again?
i have this idea for a birthday present. this person likes the color purple, but there is no purple led, i think, except uv, but thats harmful to the eyes.
so im thinking of using red and blue leds together to make purple.
i want to make a fuzzy, sand blasted acrylic material to create a hollow softball sized sphere in which the LED circuit goes.
in it, i would like to use maybe 8 red and 8 blue LEDs, in which the blue is constantly on all the time, while the red fades in and out, causing the ball to glow blue and purple in intervals.
i would also like to have the option of making the ball portable or plugged in, so maybe a battery compartment in the bottom of the sphere, and also a molex connector with a switch to change between battery power or wall outlet power with a 12v ac adapter.
have you seen the apple powerbook power buttons? during sleep mode or whatever, the button dims and goes to full brightness in intervals. does it use 2 leds, one on constantly, and the other fading, or does it just use 1 led that fades halfway and then goes back to full?
if i can get both red and blue to stay on all the time but just fade halfway, then that would be good too.
the circuit diagram was so confusing to me. i have trouble understanding where the power source is, and the direction of the current. i have very little experience with circuits.
so...........how do i make a circuit for this glowing ball?
could someone show me the circuit i would have to create and explain how it works?
any help with this birthday present idea would be much appreciated!!!
and thanks for putting up with my lack of knowledge.