Hot 7805

More
11 months 3 weeks 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

Please Log in or Create an account to join the conversation.

More
11 months 3 weeks 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... ;)
The following user(s) said Thank You: Fourstar787

Please Log in or Create an account to join the conversation.

More
11 months 3 weeks 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.

Please Log in or Create an account to join the conversation.

More
11 months 2 weeks 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
The following user(s) said Thank You: Ian

Please Log in or Create an account to join the conversation.

More
7 months 5 days ago #10725 by Lötauge
Replied by Lötauge on topic Hot 7805
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
Attachments:
The following user(s) said Thank You: Fourstar787

Please Log in or Create an account to join the conversation.

More
7 months 4 days ago #10727 by Ty_Eeberfest
Replied by Ty_Eeberfest on topic Hot 7805
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.
The following user(s) said Thank You: Lötauge

Please Log in or Create an account to join the conversation.

Time to create page: 0.174 seconds

Search

Tube Suppliers

Go to top
JSN Boot template designed by JoomlaShine.com