Hot 7805

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1 week 5 days ago #10326 by Fourstar787
Hot 7805 was created by Fourstar787
Hi. I built my clock yesterday but find my 7805 chip too hot to touch after a short while. Is there a cause and fix?
I'm using a 12v supply.
Get 4.85v and 169v respectively
Help

Regards Andy

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1 week 5 days ago #10327 by Ian
Replied by Ian on topic Hot 7805
The recommended input voltage is 9V, 12V will work, but the 7805 is definitely going to get a bit hot like that. Can you find a 9V supply to use with it?

The 7805 is generally bullet proof - it'll survive many years of pain, but if you can cut it some slack, that is going to make us all happier, clock included... ;)
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1 week 5 days ago #10329 by Fourstar787
Replied by Fourstar787 on topic Hot 7805
Cheers for the info Ian. I could have sworn I read 9-12v. Never mind not an issue. 9v psu ordered.
I've also changed out the 1k resistors on the LED separators for 6.8k. Just to make them bearable. But I've ordered neons for a better look. Overall I like it.

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1 week 3 days ago #10341 by Fourstar787
Replied by Fourstar787 on topic Hot 7805
Just to close this off a little. Got a 9v PSU yesterday - Much cooler on the 7805.
Many thanks Ian
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