Can anybody donate me a power supply. Doesn't matter if it is used and old. Kindly tell me if you have.Its really help for me.Thank you.

 

Location is everything. It would cost how much to send a power supply halfway around the world? You make no mention of your location. I doubt anyone here is a mind reader. Another reason why member location should be published.

Ron

 

Location is everything. It would cost how much to send a power supply halfway around the world? You make no mention of your location. I doubt anyone here is a mind reader. Another reason why member location should be published.

Ron

Really sorry about mistake.I'm from Sri Lanka.

 

Really sorry about mistake.I'm from Sri Lanka.

You could always scrounge parts and build one!
If requiring a bench supply, then presumably you intend building stuff!!
Max.

 

You could always scrounge parts and build one!
If requiring a bench supply, then presumably you intend building stuff!!
Max.

Thanks Max.How could I do it with low cost? Please help me.

 

Wendy's Index

Basic Bench Top Power Supplies

Start with a wall wart or a laptop power supply. There are many ways o do this.

 

Can anybody donate me a power supply. Doesn't matter if it is used and old. Kindly tell me if you have.Its really help for me.Thank you.

It seems that you aim high (nothing wrong with that) as per the image you posted.

I would try to build two fixed voltages PSUs for 12V and 5V output. Retrieving 3-terminal regulators from old equipment is not an impossible task. Could you recognize them?

Once you have them finished I would go for a variable one (adjustable I mean) based on an LM317. Before you ask about it, please read on the Web.

 

Wendy's Index

Basic Bench Top Power Supplies

Start with a wall wart or a laptop power supply. There are many ways o do this.

Thank you Wendy

 

It seems that you aim high (nothing wrong with that) as per the image you posted.

I would try to build two fixed voltages PSUs for 12V and 5V output. Retrieving 3-terminal regulators from old equipment is not an impossible task. Could you recognize them?

Once you have them finished I would go for a variable one (adjustable I mean) based on an LM317. Before you ask about it, please read on the Web.

Thank you atferrari. I will try to build one. I think it will enough for me.

 

Thanks Max.How could I do it with low cost? Please help me.

Not sure how much opportunity you have in Sri Lanka for scrap parts, but look for any electronics that is on the heavy side, it will often have a linear power transformer supply in it, even if the voltages are not what you need, you can usually modify the secondary winding's to suit.
This is what I did once long ago when I built a valve tester.
Max.

 

Not sure how much opportunity you have in Sri Lanka for scrap parts, but look for any electronics that is on the heavy side, it will often have a linear power transformer supply in it, even if the voltages are not what you need, you can usually modify the secondary winding's to suit.
This is what I did once long ago when I built a valve tester.
Max.

My expectation is to get 0-30 V and 0-10 A. Now I have an idea how I can build it my own. It's really feeling self satisfaction for me building a one my own than getting a ready made one.

 

Any time you want help, just type @Wendy , in your post and I will respond. Works for other members too.

 

Hello,

You might want to have a look at this powersupply project using a LM723.

Bertus

 

Hello,

You might want to have a look at this powersupply project using a LM723.

Bertus

Thanks Bertus. The material cant download.Can you please send it me?

 

Here is mine that I put together about 40yrs ago, still in service, unfortunately the details have long gone, or else I would have posted for you.
Max.

 

10A is is pretty big supply and you don't often need that much for general electronics work.
Starting with an old laptop supply, as suggested by Wendy, is a good place to start if you can find one at a thrift store.
They are efficient, and typically output 2-4A at around 19Vdc, depending upon their power rating.
You could use one or more LM317 adjustable regulators, to generate the desired output voltage(s).
They are simple to use, and are very rugged, with built-in short-circuit and over-temperature protection.
The have a minimum output voltage of 1.2V, but that's sufficient for most experimental purposes.

 

Here is mine that I put together about 40yrs ago, still in service, unfortunately the details have long gone, or else I would have posted for you.
Max.

wow. Its fantastic. Cant believe that is it 40 years old. Please give me details if you will find.

 

10A is is pretty big supply and you don't often need that much for general electronics work.
Starting with an old laptop supply, as suggested by Wendy, is a good place to start if you can find one at a thrift store.
They are efficient, and typically output 2-4A at around 19Vdc, depending upon their power rating.
You could use one or more LM317 adjustable regulators, to generate the desired output voltage(s).
They are simple to use, and are very rugged, with built-in short-circuit and over-temperature protection.
The have a minimum output voltage of 1.2V, but that's sufficient for most experimental purposes.

Thanks crutschow. I'm working on it. yes 30V is not need yet.But I have planned for future purposes too.

 

Hello,

The document I posted is a simple PDF, wich you should be able to download.
Here is the full schematic from that PDF:


Bertus

 

wow. Its fantastic. Cant believe that is it 40 years old. Please give me details if you will find.

I will see what I can do, I am pretty sure it was out of Practical Electronics or some mag similar.
Max.