LED circuit?
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Posted by REMUS on October 11, 2004, 4:12 pm
Please log in for more thread options electronics, so I thought I would ask people who really know! Heres the situation: I play bass in a thrash/rock-punk band and I want to customise my bass a little. And my idea is to place red LED's under the scratch plate which I will raise up with washers/nut(s) to give a glow eminateing from underneath on dark gig's. Ideally I suppose 4 or 5 LED's on a 9v battery would be about as much as I could fit under there. I dont know how to make a circuit with a switch and LED's or where to buy them in the UK. A freind mentioned I could get a sort of fibre optic wire, that he has on his PC for cosmetic effect but I guess that runs off 12v? Cheers for any advice + sorry for being so clueless! | ||||||||||||||||||||||||||||||||||||||||
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Posted by Randy Day on October 11, 2004, 2:27 pm
Please log in for more thread options Here's a circuit for what you want; it's not complex, and any local electronic parts supply shop should have them: Resis Switch tor _/ ___ Led Led Led Led -o/ o--|___|-->|--->|-->|-->|-|
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--- + | - | | | -------------------------------| (created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de) Parts List: 1 - "Single Pole, Single Throw" switch 1 - 9v battery and clip 1 - Resistor, 470 ohm to 1000 ohm, depending on the type of LED you choose and the brightness desired 4 - LED's of desired color As shown, everything just gets hooked up in a big loop; the only tricky part is making sure the LED's get hooked up 'nose to tail' as it were. If you hook it all up and get the battery polarity wrong, don't worry; nothing will happen, nothing will blow up. Just reverse the battery and try again. If nothing lights in either direction, you probably got one or more LED's backwards; nothing can blow up as long as everything's in series, so just find the culprit(s) and turn them around. >
> A freind mentioned I could get a sort of fibre optic wire, that he has on > his PC for cosmetic effect but I guess that runs off 12v? I don't know the current requirements of the fiber optic cable, but two 9v batteries in series run through a 12v regulator might work... Switch _/ .-----. |-o/ o-| |-------- +12v | | | 9v --- | | - '-----' | | | | 9v --- | - | | | -----------o----------- -12v (created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de) 12v regulator IC's are pretty cheap, so when you find a parts supplier, ask about them. Be sure to get a data sheet that shows how the pins get connected. >
> Cheers for any advice + sorry for being so clueless! Hey, everyone has to start somewhere! | ||||||||||||||||||||||||||||||||||||||||
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Posted by Richard on October 11, 2004, 7:05 pm
Please log in for more thread options > Hi i'm new to the group, and i'm not really to awesome when it comes to
> electronics, so I thought I would ask people who really know! > > Heres the situation: I play bass in a thrash/rock-punk band and I want to > customise my bass a little. And my idea is to place red LED's under the > scratch plate which I will raise up with washers/nut(s) to give a glow > eminateing from underneath on dark gig's. Ideally I suppose 4 or 5 LED's on > a 9v battery would be about as much as I could fit under there. > > I dont know how to make a circuit with a switch and LED's or where to buy > them in the UK. > > A freind mentioned I could get a sort of fibre optic wire, that he has on > his PC for cosmetic effect but I guess that runs off 12v? > > Cheers for any advice + sorry for being so clueless! There's a lot of stuff here: http://shopping.netsuite.com/coolight and here http://www.houseofrave.com/fiber_wire.html Some of it runs on as little as 2 AAs. or 9V. Google "Electroluminescent Wire" or El wire Seems like it's everywhere. Richard | ||||||||||||||||||||||||||||||||||||||||
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Posted by Dr Engelbert Buxbaum on October 13, 2004, 3:13 pm
Please log in for more thread options REMUS wrote:
> Hi i'm new to the group, and i'm not really to awesome when it comes to
> electronics, so I thought I would ask people who really know! > > Heres the situation: I play bass in a thrash/rock-punk band and I want to > customise my bass a little. And my idea is to place red LED's under the > scratch plate which I will raise up with washers/nut(s) to give a glow > eminateing from underneath on dark gig's. Ideally I suppose 4 or 5 LED's on > a 9v battery would be about as much as I could fit under there. > > I dont know how to make a circuit with a switch and LED's or where to buy > them in the UK. Buying is the easy part, most of the larger cities have a Maplin store, and you may also find some independents if you check the yellow pages. There are also several mail order stores for electronic parts in the UK, if you get a copy of elector magazine you should find their adds. For small orders however local stores are cheaper. LEDs work best with a current of 10..20 mA, the voltage required to drive that current depends on the colour of the LED (about 2 V for red, yellow and green and 3.5 V for blue and white). Thus assuming you want ot use red LEDs, you can have 4 of them in series from a 9 V battery, requiring a total of 8 V. The voltage of a new 9V-batt is about 10 V, so the remaining 2 V needs to be fried in a resistor, the resistance is calculated from Ohm's law R = U/I = 2 V / 0.02 A = 100 Ohms. As the battery empties, its voltage will drop and the LEDs will give less light. The power fried in that resistor is P = U * I = 2 V * 0.02 A = 40 mW, so a standard 125 mW resistor should handle the load easily without turning black. So your circuit will look about like this: / / +Batt o----o o-----///--->|--->|--->|--->|-------o -Batt
Switch 100 R 4 x LED red
SPST 125 mW superbright Connection of the resistor and the switch may be in any orientation, but LEDs and the battery need to be connected in the right polarity. For blue LEDs, you can have only 2 in series, and the resistor needs to be increased to 150 Ohms. But you can put several such circuits in parallel: / / 150 R 2 x LED blue +Batt o----o o-----///--->|--->|------o -Batt
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Since blue LED appear not as bright as red it may become necessary to use several such branches. This of course is only the easiest version. As your knowledge and confidence with such projects grow, you could have the LEDs go on and off in the rythm of the music, or switch between different colours. You also may consider mains supply to avoid wasting batteries, but this is something you should do only when you understand the safety implications. | ||||||||||||||||||||||||||||||||||||||||
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Posted by Patrick on October 14, 2004, 3:42 pm
Please log in for more thread options Hi im planning to do the same thing but im using it in my car. I plan
to use a total of 6 blue led's. I just wanna know how many resistors should i use and it's rating. Is it possible to do it all in parallel? thanks very much | ||||||||||||||||||||||||||||||||||||||||
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> electronics, so I thought I would ask people who really know!
>
> Heres the situation: I play bass in a thrash/rock-punk band and I want to
> customise my bass a little. And my idea is to place red LED's under the
> scratch plate which I will raise up with washers/nut(s) to give a glow
> eminateing from underneath on dark gig's. Ideally I suppose 4 or 5 LED's on
> a 9v battery would be about as much as I could fit under there.
>
> I dont know how to make a circuit with a switch and LED's or where to buy
> them in the UK.