9 volt power supply from 120 volts AC

[fixit7]

I would like to build a regulated 9 volt D.C. power supply that uses 115 v AC to supply low current circuits.

The plan I found uses a power transformer, voltage regulator, zener diode, transistor, and some capacitors.

My wall transformer puts out .6 amp which is more than I need. There is no way to take it apart without destroying it.

It weighs 44 grams( or about 2 ounces) so I am wondering if it uses a power transformer.

 

[Dr_Doggy]

more amps is better
... but the volts need to match ....is it 9v DC?

 

[fixit7]

Yes.

 

[Dr_Doggy]

then that is the supply you want

 

[ronsimpson]

That is as small as 5 watt supplies get.

 

[fixit7]

I am wanting to build one just like or close to the wall transformer.

 

[ChrisP58]

I would like to build a regulated 9 volt D.C. power supply that uses 115 v AC to supply low current circuits.

The plan I found uses a power transformer, voltage regulator, zener diode, transistor, and some capacitors.

My wall transformer puts out .6 amp which is more than I need. There is no way to take it apart without destroying it.

It weighs 44 grams( or about 2 ounces) so I am wondering if it uses a power transformer?

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You say that you "would like to build."
Is that because you think you have a need for something other than what you have? Or that you're looking for a learning experience?

 

[fixit7]

Learning experience.

 

[gophert]

I would like to build a regulated 9 volt D.C. power supply that uses 115 v AC to supply low current circuits.

The plan I found uses a power transformer, voltage regulator, zener diode, transistor, and some capacitors.

My wall transformer puts out .6 amp which is more than I need. There is no way to take it apart without destroying it.

It weighs 44 grams( or about 2 ounces) so I am wondering if it uses a power transformer?

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Please load photos directly to this site - click the paper clip button at the bottom left of the text box you type in for each post. I don't do DropBox.

 

[ChrisP58]

The power supply in your first post is a flyback type, high frequency switch mode supply. It does use a transformer, although in a flyback converter it's more accurately called a coupled inductor.

But that transformer can only be used as part of a circuit like the one that it's in. You couldn't use it as a normal line frequency transformer.

 

[fixit7]

I am using it with my laser alarm circuit.

Weight is not an issue. Using a power transformer along with zeners, etc. would be fine.

I am using 2 AAs with my laser.

I am also wanting to power it from an AC source.