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Atari cone button wiring

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jcroach:

--- Quote from: MinerAl on April 22, 2005, 12:25:09 pm ---Do not use AC!

--- End quote ---

Thanks.

MinerAl:

--- Quote from: jcroach on April 22, 2005, 12:20:45 pm ---
--- Quote from: SirPoonga on April 22, 2005, 12:12:05 pm ---Standard diode drops voltage by 0.7V. 

--- End quote ---

Thanks for the advice, but I'm completely illiterate when it comes to electricity.  What exactly does this mean?  When I go to the store, what should I look for so I don't blow this light up.

Thanks again.

--- End quote ---

Go to radio shack and tell the sweater-vest-wearing twit you'd like a pack of 330 ohm resistors.  They look like a wire with a little tubular ceramic bead attached to the middle.  Hook one end of the resistor  to the + terminal on the switch and the other to the +5v wire coming off the IPAC.  This will lower the voltage from 5v to 2v.

Good luck

Again AC=death.  don't use AC to power a DC LED.

lordsaryon:
No, computer PSU's, and the little PSU that powers the board are usually DC.  Well computer ones always are, and I cannot make that guarentee about the board PSU

SirPoonga:
A diode limited electricty to travel in one direction. Basically a one way valve for electricity.  One of the side effects is it will drop voltage down 0.7V.  Lets way you have a 5.2V supply (most likely your computer supply is within tolerances but not exactly 5.0V).  You add a diode into the system you now have 4.8V coming off the diode.  Do that until you get to the desired voltage.  Again, hopefully at 0.7 decrements you can get within desired tolerances.

For LEDs you don't have to worry too much.  Say it is a 2V LED.  If oyu run 3V too it, it will be brighter but not last as long.  If you run 1V to it, it will be dimmer but last longer.

So lets say you have an even 5V source.  Lets assume the computer averages to that. We need to drop about 3V.  Well, the closest to that will be 4 diode, dropping 2.8V.  You will get 2.2V output which is close enough for this situation.

So, how to wire?  Just wire the 4 diodes in series in the correct direction so the electricity flows the right way.  I don't think it matters what side of the LED you wire them too as long as they are in the right direction.  I can't remember, it's been awhile since I had to do something like this.

ChadTower:

--- Quote from: jcroach on April 22, 2005, 12:28:06 pm --- Isn't this AC power coming out of the PC? 

--- End quote ---

No.  The whole point of the power supply is to convert AC to DC, then step it down and distribute it over all the little ide power connectors/etc.

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