Cooling Fan: Always On or Run off a crude Comparator? Noob

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Benny,Esq
Posts: 1
Joined: Sun Feb 20, 2011 4:46 pm
Location: Corvallis, Ore

Cooling Fan: Always On or Run off a crude Comparator? Noob

Post by Benny,Esq »

Howdy all:

Long-time lurker. I'll start with apologies if this is an answered topic as I don't trust my search skills. Nevertheless, I'm preparing to build my first two portable NESes.

I'm concerned about heat build up issues and possible attaching a small brushless fan. I'm not sure if it's needed, or is overkill. If it's needed, are there any known shorcuts to triggering it for part time use? My first thoughts were to use a basic comparator to assign on/off voltages to whatever temp(s). . . which raises another question: At what core temp to start the fan? Anyway, I'm guessing I'm overthinking things like usual, feel free to laugh :)

As for power:
I'll be using this really nifty all-purpose charger board. Image
This thing is great and will charge almost any battery series/pack with any wall wart (it has a robust bride rectifier that will take anything/any polarity from Fischer Price toy plugs to laptop cables). I'll be using it to charge 6 AA's.
Here's a link to the relevant schematics for the charger board (look for the pdf's under "Documents"): http://eecs.oregonstate.edu/education/r ... rgerboard/

One will have a 3.5" screen and the other a 4.3" (DealExtreme variety), I haven't decided on audio, but I bookmarked some link from the forums talking about splitting the mono signal.

I'm also going to cannibalize some USB memory sticks and work it in with the video processor and audio (for video/mp3 use); or just wire in a SD Card reader. If I can find the cheap FM receivers I used have lying around, I'll find a place to hot glue that board in as well/in place separate audio amp.

As for casing, that's my weak point. Not sure what to do. I have all my parts, but nothing to dress them up in.

That's about is. Any/all input is appreciated. Especially related to having a cooling fan.
jaqiefox
Posts: 53
Joined: Tue Sep 13, 2011 8:30 pm
Location: 127.0.0.1 (jct cty, OR)

Re: Cooling Fan: Always On or Run off a crude Comparator? Noob

Post by jaqiefox »

first, hello corvalis, OR. I am in junction city, OR!

If you need some help in person or over phone, I would be glad to provided youre not creepy :P

I used to be a pc technician, and am now disabled and do this stuff by hobby. just regged here as just got bit by the console collect and mod bug.

the nes chip is so slow that I seriously doubt youll need cooling of any kind, but you can buy these awesome little heat sensing guns (IR probes) to check temps of chips for pretty cheap nowadays. 60c on the surface is perfectly acceptable, 90c is where it starts getting iffy, but just adding a hunk of aluminum or something on top helps tons, or a stick on ram heatsink would be good.
Jaqie Fox, Genuine girl techie | http://foxtecha.com
Reaper P7
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Re: Cooling Fan: Always On or Run off a crude Comparator? Noob

Post by Reaper P7 »

Welcome to the forums. Having some holes in the case and at maximum a heat sink will resolve any heating fears. Look at the design of the original console: It doesnt have nearly as a high heat consideration as the ps3 or a modern laptop. My main concern would be heat from your battery, keep that to the side and youll be fine.
Cheers,
Pauly

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