How hot should the 7805 on the Psone screen get?

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.

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Pkmnjunky7
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How hot should the 7805 on the Psone screen get?

Post by Pkmnjunky7 »

The one that is towards the side on the mobo, not the one towards the bottom. Its getting really hot. Should it be very hot? If not, what can I do to fix it?
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nevermind1534
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Re: How hot should the 7805 on the Psone screen get?

Post by nevermind1534 »

Pkmnjunky7 wrote:The one that is towards the side on the mobo, not the one towards the bottom. Its getting really hot. Should it be very hot? If not, what can I do to fix it?
What's the input voltage?

They can get quite hot.
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snowpenguin
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Re: How hot should the 7805 on the Psone screen get?

Post by snowpenguin »

If you're really concerned about it, you may add a small heatsink on the metal end.
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marshallh
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Re: How hot should the 7805 on the Psone screen get?

Post by marshallh »

Linear regulators get hot. That's pretty much it :mrgreen:

If you haven't tapped anything off the 7805 it will be perfectly fine. I even ran an entire SNES mini off the audio 7805 (right side). Got a bit hotter but no problems.
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rikitheshadow
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Re: How hot should the 7805 on the Psone screen get?

Post by rikitheshadow »

Ya, linear volt regulators will get hot, because that is how they are designed. They lower voltages by passing it off as heat.

Buuuuuuuuuttttttttt, hopefully it shouldn't get hot enough to melt components lol......though it probably has a safety cut off..or will melt itself first....
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Re: How hot should the 7805 on the Psone screen get?

Post by Kurt_ »

A quick search shows 125 C is the highest continuous rated operating voltage. Pour some water over it when it's running, if it boils, it's too hot.

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Re: How hot should the 7805 on the Psone screen get?

Post by Squidlekins »

I was about to ask the same thing. I have my intec gamepad screen laying out in a wire-like hell attached to my Super joy III and this little component (I'm assuming it's also a 7805) is getting hot enough to... well... burn my finger and smell like burning electronics.
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