# Could you help me?

Discussion in 'The Projects Forum' started by nousatya, Aug 12, 2013.

1. ### nousatya Thread Starter New Member

Aug 11, 2013
3
0
how can we convert 220v AC to 15v and -15v in DC.

2. ### WBahn Moderator

Mar 31, 2012
23,878
7,388
With a bipolar power supply.

3. ### Ramussons Well-Known Member

May 3, 2013
764
136
To put it simply, you need a Transformer to step down 220V AC to 15 V AC. You will need Rectifiers to convert the AC to DC and reduce the ripple using Capacitors. You may also need Voltage Regulators.

If you can tell us more - Purpose, Required Current, How steady the Voltage needs to be, etc; more advice can be given.

Ramesh

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4. ### nousatya Thread Starter New Member

Aug 11, 2013
3
0
no matter about current. the main purpose is to get 15v and -15v in one curcuit.

5. ### kubeek Expert

Sep 20, 2005
5,456
1,036
Well, good luck then.

6. ### Ramussons Well-Known Member

May 3, 2013
764
136
Here you are.

Ramesh

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7. ### KMoffett AAC Fanatic!

Dec 19, 2007
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283
That circuit will give you +21V/-21V under no load, and will drop to +15v/-15V only under some undetermined full load.

Ken

8. ### #12 Expert

Nov 30, 2010
18,076
9,678
True. Better to use a center tapped 24V transformer for an unregulated job like this.
Use the center tapped 30 volt if you are going to add regulator chips.

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9. ### WBahn Moderator

Mar 31, 2012
23,878
7,388
If you want to stay real cheap, then use something like this:

You would want a 220VAC:12VAC transformer.

This (or the full-wave version above with a 24V centertapped) will give you about 17V under no load but that will drop as you load it.

Just saying you want ±15VAC with no current level and no other information to go on makes doing anything more that something real rough difficult.

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