# LED Spotlight

Discussion in 'General Electronics Chat' started by 7miles, Apr 25, 2012.

1. ### 7miles Thread Starter New Member

Feb 24, 2012
8
0
@bill marsden can u tell me how to increase the current output of a rectifier...
i have designed a rectifier from 220v ac to 12 volt dc for a led spot light(6watts)...
the current output i have is only 300 mili amperes..
but the minimum current that i require is .5 amps at 12volts
can u solve this hurdle for me or atleast tell me wat to do.......

i m using a bridge rectifier of 10 amps rating
1200uf polar capacitor for filtering...

2. ### Wendy Moderator

Mar 24, 2008
20,765
2,536
Welcome to AAC!

A thread belongs to the OP (original poster). Trying to take over someone elses thread is called hijacking, which is not allowed at All About Circuits. I have therefore given you a thread of your very own.

This was split from Submission: Power Supply Circuits

Before anyone can really help you you need to give more information. I understand English is most likely a second language, so I would aim for a schematic, which is the language of electronics.

Are you using a wall wart, which is a power supply that plugs directly into an outlet?

If you are using what I think you are, then you will need a bigger power supply.

3. ### #12 Expert

Nov 30, 2010
16,278
6,791
In a shorter sentence, the only way to increase the current output of a rectifier is to put more current into it. Rectifiers don't generate current, transformers do.

Feb 24, 2012
8
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5. ### 7miles Thread Starter New Member

Feb 24, 2012
8
0
i cant attach the file as i dun know how to atach file in this forum

6. ### debjit625 Well-Known Member

Apr 17, 2010
790
186
Hey that's not a link to any circuit diagram, it's link to Bill's profile.

Here is what you need ....
A 220 VAC to 12 VAC center tapped step down transformer with 500mA current rating at the secondary side,use your bridge rectifier of 10 amps or you can use four IN4007 diodes to make it and two 1000mfd capacitor for filtering is enough.

Good Luck

7. ### #12 Expert

Nov 30, 2010
16,278
6,791
That stuff should provide plenty of power for your 500ma light.
If you measure excess voltage at the capacitors when the light is on, you can reduce it by adding about 2 ohms per excess volt, in series with the light.

8. ### Wendy Moderator

Mar 24, 2008
20,765
2,536
I tend to favor wall warts, they are exceedingly cheap, so why reinvent the wheel (unless you just want to learn how to make a wheel).

Show us a concept of what you want.

How to upload an attachment

To attach a document or picture to a post

Click "Go Advanced" at the bottom of your post,

One of several options will pop up,

Click "Manage Attachments" much further at the bottom of your post,

To upload a file from your computer click "Browse", then select the file.

Schematics should be .gif or .png format, pictures should be .jpg. .jpg formats will fuzz out schematics, and should not be used for that purpose.

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If you want to display this file there is an old thread I made,

How to Display Attachments Full Size