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Hot 7805
Hot 7805
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3 years 2 weeks ago #10326
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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3 years 2 weeks ago #10327
by Ian
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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3 years 2 weeks ago #10329
by Fourstar787
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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3 years 1 week ago #10341
by Fourstar787
Just to close this off a little. Got a 9v PSU yesterday - Much cooler on the 7805.
Many thanks Ian
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2 years 7 months ago #10725
by Lötauge
Hello,
Since I run the 4 digit clock with 12 volts, I have the 7805, which is very hot, removed and exchanged for a Murata DC / DC Converter. It is not cheap but works very safe without getting warm.
Best regards
Torsten
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2 years 7 months ago #10727
by Ty_Eeberfest
Torsten, yes, I agree with you about the Murata converter. I've used them on several of my own projects and they are great. But as you said, they are definitely not cheap!
Look into it later when the dust is clearing off the crater.
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