iceman302

ok i get it but i have to stick with the restriction of "for every four led's i must have 2aa batteries".this could either be 4aa's to eight led's or 8aa's for 16 led's. it's a little hard to explain but thats what my brief states. i guess now u can understand why i need help ??? but i get the gist of wat u r saying and again sorry for all the confusion. but this restriction is a bit part in the marking so i want to stick to it. i really don't care if the other batteries are wasted as long as the lamp is bright as possible. thats for the help so far its been a god send

hey it me again :), sorry to disturb every1. ok i just got the parts in and i was wondering if the following configuration is correct before i put it together. note that the resistors are 120 ohm's. i just need an ok and i'll be on my way. sorry bout all the confusion and all aduioguru. :-\ :-\ :-\ :-\

ok thanx audioguru, sorry bout the trouble i really should be a lot clearer when i post. ;)

sorry to be a bother u again audioguru but i was just wondering, if i wanted say 8 led's instead of 4 and run it on 4 aa batteries how would i go about altering the circuit u gave me to do this? because i'm afraid that four will not be bright enough? and i figure that it maybe a bit easier to do two 8 led circuit then try and connect 4 of the circuits u gave me. thanx for the help so far its been great.

oh ok thanx m8 if i have any more problems then i'll post ;)

hey audioguru forgot to ask lat time wat type of capacitors work best for that circuit u gave me? and i can't find any 7660 IC's anywhere. is there any alternative circuit or parts that i could use. i'm also going on a long shot to try and find the 7660 but i'm just asking if theres an alternative just in case i can't get the parts

ok heres what i thought at first the circuit would be like, but found that it was too dim and sometimes just didn't work. uhm i also noticed a loophole in my project brief. although i have 16 led's, i only use 8 at a time so i'm sure that i could use the full 12volts across 8 led's. my question is will this work? and will it be brighter?

audioguru, oh yeah also forgot to ask i f i was going to use 8 led's and 4 batteries do i just connect the circuit together. and i regard with the switching part i'm a bit hazey. uhm i need to have one circuit[the one u gave me(clear led's)] switch to another[same type of circuit(blue led's)]. where it switches from mood to direct. and also i need an on off switch so where does that go? uhm if u r unclear i'll try to post wat i think the circuit should look like. god i'm really in too deep.

hey this is iceman again, forgot to ask before but wat type of led's do i use 3v or 12v. umm i'm also having trouble finding the 7660ic, they don't seem to have it down under. don't worry if i need to i'll order off the net. just wondering if there are any other alternatives.

hi its iceman here, uhm i'll see if i can get hold of the parts, i don't know about the digikey chain of stores because i live in australia, but i'll see if i can find those parts. another thing is, in regards to audioguru's diagram so do i connect all those little arrows to the negative end of the battery pack. ok thanx guys i'll give it a try and see wat happens and report back.

yeah the project states that for every 4 led's there must be 2 aa batteries. [where a set is 4 led's to 2 aa's] this is a requirement that must be meet. note[ there is no limit to the amount of sets u can have]i.e if i want 16 led's i need 8 aa batteries or if i wanted 24 led's then i need 12 batteries with regards to the time it must be on, well i need to do a five minute presentation and it must be able to be keeped on for about say 4 hours when the marker marks the project. so it doesn't have to last long. it just needs to be as broght as possible. if its not to much of a problem could u give me a parts list i require because i don't really have access to an electronic workshop. thanx

ok, i had a feeling that something like that was going to be the case. thanx for the heads up audioguru. uhm i haven't put the circuit together yet so i really have no clue to stepping any voltage up yet. but the light must last for as long as possible. but there is also an on/off switch. and there is alos a switch to change from direct into mood lighting. so in that case do i need to up the voltage or current across them? and how do i go about doing that, so that the led's don't blow because i have done it to a few already.

hi there folks , i am building a lamp for a uni project and am trying to get some help from u guys. the project is a lamp which is able to change from direct into indirect lighting(mood lighting) which must contain and on and off switch. the lamp must be powered by aa batteries with a condition{ that for every 4 led's there must be 2 aa batteries. ie a set => 2aa's=4led's} the lamp must only consist of led's. i have an idea of a simple circuit. what i am asking is for a combination which will give me the brightess light. note i already have a lamp design, it consist of using blue led's for mood lighting and white led's for direct. any help would be great.thanx just asking how do i make 8 led's running on 4 aa's, be the brightest they can be [no restrictions on parts] {sorry bout posting in other section, this is the right place)

hi there folks , i am building a lamp for a uni project and am trying to get some help from u guys. the project is a lamp which is able to change from direct into indirect lighting(mood lighting) which must contain and on and off switch. the lamp must be powered by aa batteries with a condition{ that for every 4 led's there must be 2 aa batteries. ie a set => 2aa's=4led's} the lamp must only consist of led's. i have an idea of a simple circuit. what i am asking is for a combination which will give me the brightess light. note i already have a lamp design, it consist of using blue led's for mood lighting and white led's for direct. any help would be great.thanx

the project i am doing is a 5 minute timer where a machinical motion is required. mine is water helped by gravity and pressure. the project states that the timer must show minute incrimant. thus my design was to have water filter across so as in rises in cylinder 2 it will complete circuits turning on lights to indicate each minute. also there is no limit or restrictions on materials or methods. just that no motors are allowed. my question is will salt work???