Help w/ powering an N64?

[Muniosi]

I'm starting a project based on an idea I saw here that was never carried out. It was to take apart the N64's transformer, remove the cable, and use the casing as a battery pack. I thought it was a great idea, and was sad to see it die. Now I want to resurrect it. I had a question about the image in this topic: what are the green and black components? Also, do the 3.3v lines have to take exactly 3.3 volts? Or can they take a little under or over? And to what extent? Finally, can anyone suggest a good battery that would fit in the N64's transformer?

[jjhammerstein]

I am going to redirect you to a better guide for getting 3.3v.
http://forums.modretro.com/viewtopic.php?f=33&t=7607" onclick="window.open(this.href);return false;

Batteryspace.com is a god place to get batteries. Lithium Ions are the best, but cost more, and require special charging and discharging.

Lithium cells give off 3.7V each. The 12V line will run fine off of 7.4v, so you only need two cells in series. Or, you could do 4 cells in series-parallel for longer battery life.

The easiest way is to just buy one of these, they have a protection circuit built in.
http://www.batteryspace.com/7.4v-5.5-ah ... dules.aspx" onclick="window.open(this.href);return false;

And one of these chargers.
http://www.batteryspace.com/smartcharge ... isted.aspx" onclick="window.open(this.href);return false;

[Muniosi]

Thanks, that guide really helped! I'll have to measure the transformer dimensions when I get home (I'm on vacation right now) and see which batteries will fit. Is this what I want to step down the voltage? In the guide, SS mentions that it's possible to combine two resistors to make a 1.87k resistor. To do this, would I just take, say, a 1k resistor and a 0.87k resistor and wire them in series?

[jjhammerstein]

Yep, or 7 13kΩ resistors in parallel, if you really wanted. Or you could do more complicated math, but 1.87kΩ resistors are actually pretty common and easy to find, you might as well just get the right ones for the job.

That is the regulator you want.

[Muniosi]

Thanks for helping me out! Could you explain the math behind wiring 7 13k resistors in parallel?

[Black Six]

Thanks for helping me out! Could you explain the math behind wiring 7 13k resistors in parallel?

(7*(1/13,000 Ohm))^-1 = 1,858.736059 Ohm
See here for the theory behind it.

[Muniosi]

Okay, thanks. I think I'll just find a 1.8k resistor. Is there a calculator that'll tell me how long a given mAh rating will last on an N64? I thought there was, somewhere.