# HELP 12V DC TO 5V DC

Discussion in 'General Electronics Discussion' started by n o v l i s, Aug 19, 2010.

1. ### n o v l i s

3
0
Aug 19, 2010
Hi to all.

i create diagram.pls check if right daigram and right parts?

i create diagram.

#### Attached Files:

• ###### rigt.JPG
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Last edited: Aug 19, 2010
2. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,482
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Jan 21, 2010
You missed the ground connection on the 7805.

Depending on the current you may need a heatsink on that 7805.

3. ### n o v l i s

3
0
Aug 19, 2010
i forgot a ground. but right input an7805 12v dc to 5v dc sir?

4. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,482
2,830
Jan 21, 2010
Yep, that looks much better

3
0
Aug 19, 2010
thanks sir.

6. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,482
2,830
Jan 21, 2010
At ease Private!

(Seriously, don't call me "sir")

7. ### shaheen

28
0
Nov 1, 2009
this is the circuit diagram to convert 12V into 5V.

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8. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,482
2,830
Jan 21, 2010
Which in some respects has less detail that the original author's diagram.

Since you've changed it, perhaps you can explain why you have changed the values of the capacitances and why you have added the extra capacitor.

You might also like to specify voltage ratings for the components and give us reasons for them too.

If you're going to start posting alternative circuits, you should be ready to explain the benefits of your circuit and/or different component values. To do otherwise risks adding a degree of confusion for the original poster and anyone coming back to read this thread later.

edit: the solution here isn't in any way definitive. For example, you may like to explain why you didn't place a reverse biased diode between the input and output of the 3 terminal regulator?

9. ### shaheen

28
0
Nov 1, 2009
I am sorry if anyone confused with my circuit.

voltage rating is the same as above. i-e 50v for 100u and 16v for 10u.
Capacitors are added to remove the AC components.
Actually I used this circuit(which i uploaded) and built a power supply, this is working very well. It will also works if you don't use 100n capacitor.