Would something like this work? http://www.linear.com/solutions/5007
If so, where can i buy one?

 

Would something like this work? http://www.linear.com/solutions/5007
If so, where can i buy one?

That is a really nice find. Good work. That should be perfect. How old are you?

 

Thanks so much! Now i just need to find out where to buy that ITM8025. And im 12 years old BTW.

 

Thanks so much! Now i just need to find out where to buy that ITM8025. And im 12 years old BTW.

Hooooooold on, the LMT8025 is a module with some weird solder pads for surface mount that doesn't meet your design criteria of through-hold pins.



Sorry, Try again!

 

Maybe i should use this: http://www.mouser.com/ProductDetail...6nhgWoUFlQ==&gclid=CMudm_Th98oCFRFahgodxdAC_A
And then have something bump up 5v to 12.

 

You have to make sure how much current you need, 1~2A, if you need 2A and buy a dc to dc /2A the it will be hot, hot, hot.

 

Hooooooold on, the LMT8025 is a module with some weird solder pads for surface mount that doesn't meet your design criteria of through-hold pins.
View attachment 100703

This could work for me. I am going to have a double sided PC board.

 

The 5 volt regulator will need extra amperage to allow boosting to 12 V. First, that process is not 100% efficient. Secondly, you can't create more power than you start with so, to make 12 V at 2 A, (24Watts), you need 25 watts plus some extra for efficiency losses for your 5V source. So, 6 amps at 5 Volts (30 watts or so).

 

what is your project btw ? 1-2 amp is big current, will sure heat up everything/ set something on fire (including wires) unless you know what you are doing.

 

Im confused. Isnt there a buck converter that turns 24v into 12v? If so, what is the model number?

 

there two ways
1. simply use a voltage divider (wastage of power)
2. design a buck converter (efficient method)

 

there two ways
1. simply use a voltage divider (wastage of power)
2. design a buck converter (efficient method)

which buck converter do you recommend?

 

http://m.ebay.ca/itm/5pcs-DC-DC-Pow...ule-1-23V-30V-Newest-/331215975343?nav=SEARCH

 

I think i finally found something that may work
http://smart-prototyping.com/MP1584...onverter-24V-To-12v-9V-5V-3V-for-Arduino.html

 

Looks promising.

 

http://www.ebay.co.uk/itm/like/1117...ICEP3.0.0-L&ff14=122&viphx=1&ops=true&ff13=80

 

Thanks guys! i'll use what i found!

 

Look on ebay for "Buck Converter". You can get an adjustable buck converter for under $1 including shipping. I would get two identical ones and use one to go from 24 to12 an the second one to go from 24 to 5. These produce only a small amount of heat (90+% efficient). Much less than a divider or linear regulator. Ed

Look on ebay for "Buck Converter". You can get an adjustable buck converter for under $1 including shipping. I would get two identical ones and use one to go from 24 to12 an the second one to go from 24 to 5. These produce only a small amount of heat (90+% efficient). Much less than a divider or linear regulator. Ed

http://www.ebay.com/itm/1-DC-DC-Buc...861491?hash=item2a3cdecf73:g:SYYAAOxywFhTc1zI

 

They say "Don't build, buy!" Rather than trying to build something that already exists, you're better off simply buying the part you need.

I see you've asked about dropping your voltage possibly down to five then back up to 12. That's not a good way of approaching it. You'll be better off splitting your 24 volt supply and using one half to give you the 12 volts you want and the other for the five volts you want.

Being that you're a young engineer, some more information might be useful to us. I'm wondering if your transformer has a split secondary, or center tap. I'll draw up some pictures and post them shortly. But if your transformer has three wires on the output then you probably have a center tapped secondary. It may also be possible you have two individual coils (secondaries) giving you 24 volts. I'll draw that too.

Also keep in mind the Buck Converter requires DC voltage. So you'll need to rectify and filter your power BEFORE you do any conversions. I'll draw that too.

Let me know if you have any further questions and I'll try to give you all I know (which isn't all that much).

 

I suggest you take a look at these two options:

http://www.digikey.com/product-detail/en/V7812W-500/102-2454-ND/2757920
http://www.digikey.com/product-detail/en/V7805-2000/102-2175-ND/2352134

They're kind of expensive, but meet your requirements, I think.