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post #1241 of 2446
Quote:
Originally Posted by jpz View Post
The 7805's can put out more than 1W in eletrical power, as well as in heat.

Every variant of the 7805 I have come across has been rated for 500ma-1A. Usually they are rated for 1A with a heatsink- that means 5W electrical output power. The amount of energy dumped as heat depends on how much current your circuit draws from the 5V, and the input voltage to your 7805. If you had the 7805 hooked up to a 12V supply, it would put out (12V - 5V) * current draw in heat. A small circuit drawing only 150mA will cause the 7805 to put out 1W waste heat when running from a 12V supply. I've seen 7805's put out as much as 10W waste heat(with a good heat sink).


I gotta find something to blame that on! ...I'm tired..

Can't believe I mixed amperage and wattage up
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post #1242 of 2446
I will have none of this circuit talk in my thread about motorcycles.
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post #1243 of 2446
Even driving a small load with a low input voltage, they can get hot enough to burn you unless you use a heatsink. I'm surprised the inside of that mouse hasn't melted. The nice thing about the 7805 is that between overcurrent and thermal protection, it's nearly indestructable.
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post #1244 of 2446
Quote:
Originally Posted by McStuff View Post
I will have none of this circuit talk in my thread about motorcycles.
Motorcycles need vregs too

Quote:
Originally Posted by jpz View Post
Even driving a small load with a low input voltage, they can get hot enough to burn you unless you use a heatsink. I'm surprised the inside of that mouse hasn't melted. The nice thing about the 7805 is that between overcurrent and thermal protection, it's nearly indestructable.
Damn...I never knew that - I'm certain I've killed them before, and I've run the 7805s a lot w/o a heatsink, and maybe a 7812 too
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post #1245 of 2446
Quote:
Originally Posted by Error 404 View Post
Motorcycles need vregs too
But as I'm sure Syr will say, the last thing on your mind when riding a bike is the vregs.
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post #1246 of 2446
Quote:
Originally Posted by McStuff View Post
But as I'm sure Syr will say, the last thing on your mind when riding a bike is the vregs.
Oh hush...I know, I've ridden


I HAVE A RIGHT TO MY OFF TOPIC POSTS IN SYR's THREADS
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post #1247 of 2446
Unless smoke came out of them or there was any sign of physical damage, you probably didn't kill them. AFAIK the only way they can be killed is by becoming reverse biased(if you don't use a diode for reverse bias protection). I'm not sure, but there may be a few 7805 variants that do not have thermal protection and/or overcurrent protection.
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post #1248 of 2446
Quote:
Originally Posted by Error 404 View Post
Oh hush...I know, I've ridden


I HAVE A RIGHT TO MY OFF TOPIC POSTS IN SYR's THREADS
I HAVE MORE OF A RIGHT. I've jacked his threads for pages in conversation between him and I, and I intend to keep doing so.
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post #1249 of 2446
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post #1250 of 2446
Quote:
Originally Posted by McStuff View Post
I will have none of this circuit talk in my thread about motorcycles.
lol
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