"Help!" for: Electronics

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It depends on a number of factors. What is your source voltage? What type of LEDs are you using and what is their forward voltage and recommended forward current? How many LEDs are you using? To design very simple LED circuits, I use this website...

http://led.linear1.org/led.wiz

Really, the only thing you need to know is your source voltage (9volts, 6volts, whatever) and how many LEDs you will use. The forward voltage and forward current for most LEDs is 3.5v and 20mA respectively. There are some LEDs that have a forward voltage of 3.7v, and they will be so marked on their packageing, but 3.5v would even work for a 3.7v LED since most electronics are manufactured with a degree of tolerance. The program at this site does the rest for you, even designing multiple circuit options if there is more than one solution. Based on the results of this design, you can plan a shopping list and head to the store.
 
thank you! this is just what i was hoping for! if there was a +REP i would hit the button.

But.................................

you gets a COOKIE INSTEAD!!!!!

chocolate_chip_cookie.jpg
 
what about the energy sword and its electric pulse? like purple white blue etc? and i want to bring back a question what about a fan? in the helmet?
 
what about the energy sword and its electric pulse? like purple white blue etc? and i want to bring back a question what about a fan? in the helmet?

Only one fan? I have two blowing in on me. They're wired in parallel to a 9V battery, with an easily accessible switch on the outside.

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Just pick a good spot with plenty of ventilation to provide good air flow. I also recommend test fitting all of your wiring in place before you solder anything. Then I hold my wires in with dabs of hot glue, and cover them with padding.
 
I'm making a Dead Space 2 Advanced Suit for Halloween and I was wondering about wiring the RIG on the back. I want to wire up ten blue LEDs up the spine and then two red blinking LEDs next to the two lowest blues.

I was wondering if it would be possible to use a single battery and switch to toggle between the blue LEDs and the red ones? If so, how would this wire to the battery?

Thanks for any help in advance.
 
You would use a SPDT switch (very common). Has three connectors, the center is the common connector. Slide to the right and the right connector is ON. Slide to the left and the right connector is ON.

Some even have a center position for both OFF.

The inside of a SPDT switch looks like this:
SPDT_sw.png


The outside can look like a lot of things. Slide, toggle, pushbutton, etc...
 
Thanks bunches on the info on my previous question. Helped a LOT!

The Iron Man suit is coming along great. I just have 2 more questions about it.

For the reactor in the chest, I was thinking about adding the part of an old camera that makes it flash so it would give a sort of "Uni Beam" blast effect. Is this possible? My other question is, can you temporarily "overload" 1 LED using 2 power sources so it would get extremely bright only for a moment to sort of make it look like it was firing?

Idea> Hand LED: {Constantly ON (3v)} [3v only on when pressed] Would it create 6v total?

LED maximum power 5v, minimum 3v (3v "over" will make it brighter) I know it "could" burn out the LED but I've played around with the power. It wont burn out from short term exposure. Forgive my redundancy here. 2 power sources, 1 LED, 1 source on, 1 source on when switch is activated, 3v over minimum turns blue LED cyan.

Thanks!
 
theres some compact voice synthesizers out there that you can make from scratch, i havnt tested any of them yet or else id link them, when i do i will
 
OMG!! DO NOT try what I asked about concerning the disposable camera unless you know what you are doing!!!

The idiot I am, was shocked by 300wv or more twice in a flippin' row! I took apart the camera, being careful to remember what went where. I took out the part I needed (the circuit board with the flash unit) and played around with it. Thankfully my dad was helping me out with it b/c holy freakin' crap! It HURT

My advice: When trying this for whatever reason, make sure you DO NOT over charge the capacitor! This is harmful if not deadly. Idk if im over reacting but... ever accidentally touch the metal on the plug of a vacuum cleaner? That nasty tingling feeling was electricity flowing through you. This gives the same effect if not worse... heck, it felt worse.
When charging the capacitor you will hear the "flasher" charge up, when it stops making noise STOP the flow of power. If you did what I did and disconnected the, well, Im not sure what to call it, the discharge setup I guess. When you touch the black wire to the red, the energy discharges and it flashes.

Im not sure if the capacitor is completely empty so I will let it bleed out for a few days unless I can find my power meter.
DO NOT for whatever reason touch the legs of the main capacitor. I hope my mishap will save you from a bit of pain I ran across tonight, haha.
 
Ha, yep. Not deadly but will give you a wicked burn.

You can discarge the capacitor by holding a resistor across the contacts. 10k ohm should be plenty.

Idea> Hand LED: {Constantly ON (3v)} [3v only on when pressed] Would it create 6v total?
Not sure I follow, can you draw a picture?

No worries about playing with LEDs and burning them out. As long as you have extras, play around with em! Just be more careful with high voltages.
http://www.dummies.com/how-to/content/avoiding-electric-shocks.html
 
Not sure I follow, can you draw a picture?
Sorry I did not draw it in a more sophisticated form. Still learning all the symbols in my spare, spare time. haha
basically this: http://s1197.photobucket.com/albums/aa428/TheFoamMaster/?action=view&current=LED2batteries.jpg

Specifically this: (if the first one works) http://s1197.photobucket.com/albums/aa428/TheFoamMaster/?action=view&current=LEDandblinker.jpg

Lemme know if you were able to view them.

Oh! thanks for the advice and link
 
I think he means that the LED is on with a dim glow all the time, but when activated it loops between a dim glow and a bright light. In other words when turned on it goes bright dim bright dim.

YES!!! Exactly!


And the blinker in the second picture, I ripped it out of an old store bought Batman costume. Works like a charm. I just haven't added it to my idea yet. I dont want to jump the gun again and get shocked half to death... again, lol
 
Simplest solution for ya. Have a high resistance path and a low resistance path. The switch is on the low resistance path. Flipping the switch makes the Light brighter.

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switchbox by thatdecade, on Flickr
 
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