If you're making a portable you probably need something to watch it on. (Unless you want to guess what's happening in the game, but I wouldn't advise that) Anyway, this forum is your "Hacking a pocket TV/screen" one-stop solution. Share your experiences and knowledge here.
I have been on a long quest to master the DC-DC converter. Ben used a step-up one in his Neo Geo Portable but never revealled (to the bestof my knowledge) how or what he used. However, I have the perfect solution to all portable power supplies!
This chip is beautiful...it will output up to 3A power at almost any desired voltage. I have already constructed one with its few external components and it works great. Best of all, there's just a simple equation of 2 resistors to decide the output voltage! and because it's DC-DC it retains over 80% of the original power source in the output... This would be great to use on N64ps and I'm already using it for my PS2p and my portable gainclone.
Erm... this is a step-up regulator isn't it? Well that's kind of stupid since you'd have to regulate up to 3.3v for the n64.
I think a step-down regulator is much more useful... Since most of us use 7.2v batteries it makes more sense that way.
Unless, this chip is also a flyback regulator. Can you output a lower voltage than what your a putting into it?
Yes, Marshall, it's a step-up converter. I wasn't suggesting stepping up to 3.3v for an N64, but stepping up to the 12v. That way you can use one battery (I would suggest a bunch of paralleled 3.7v li-ion batts) and you can step up the output to 12v while using the ~3.7v output at the same time.
The idea is you can use less series-connected batteries but still achieve the desired voltages. ie for my gainclone I needed a 24v supply but Im using 12+the DC-DC converter instead.
exactly whgat i was thinking, one lipoly battery with 6000 ma and this step up would work great, i may try this on an N64p when i actually get some money
segasonicfan wrote:That way you can use one battery (I would suggest a bunch of paralleled 3.7v li-ion batts) and you can step up the output to 12v while using the ~3.7v output at the same time.
The idea is you can use less series-connected batteries but still achieve the desired voltages.
If you went from a 3.7V battery up to 12V, wouldn't that be pulling about 1-1.6A off the battery (instead of .3-.5 amps from a 12V source)? Seems kind of counter productive .
Geeze, some people really aren't getting this.... N64p was just an example, this can be used in many applications. and in the N64 the 3.3v line is the primary power source so having a good amount of paralleled batteries to do the job and the rest for the 5v/12v source. I'm done explaining its application on the N64...it was just an example.
segasonicfan wrote:Geeze, some people really aren't getting this.... N64p was just an example, this can be used in many applications. and in the N64 the 3.3v line is the primary power source so having a good amount of paralleled batteries to do the job and the rest for the 5v/12v source. I'm done explaining its application on the N64...it was just an example.
-Segasonicfan
I understand that the N64 was just an example; I was just applying the current considerations to it. Regardless of what you're powering, stepping up the voltage any amount is going to draw more current/reduce battery time when compared with a battery with the required voltage and equivalent mAh rating. It is a nice find though, and could be pretty useful for smaller step-ups (couple of volts) .
yea, well I originally investigated this converter for portable audio purposes. Almost all audio amplifiers are high voltage and you have to go to some trouble to get high current/low voltage ones (and they usually suck). So this chip is a dream come true for gainclone projects where the required voltages range from 25-35 volts.
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