12v convertor to + 30v dc 20a

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=132770
Printed Date: May 12, 2025 at 12:15 PM

Topic: 12v convertor to + 30v dc 20a

Posted By: hadighorbani
Subject: 12v convertor to + 30v dc 20a
Date Posted: November 24, 2012 at 1:14 AM

Hi to all friends

i am new in this site

i want creat my owen car amp

i need a converter 12V DC to + - 30V DC

any one can help please ?

Hadi_ghr_e_61@yahoo.com

thanks dear friends

Replies:

Posted By: oldspark
Date Posted: November 24, 2012 at 7:21 AM

Try current-logic.com.

That's 1200W output, and probably hence ~120A input.
EG - maybe two customised CDP720-12S24 types (12V in, isolated 24V out, 30A) changed to 30V output. But there may be other options.

Posted By: hadighorbani
Date Posted: November 27, 2012 at 10:26 PM

i want creat hat with my hand

i dont want buy it

can you please help me ?

Posted By: oldspark
Date Posted: November 28, 2012 at 5:09 AM

google "smps ic datasheet" etc.

The MC34063 & TL496 are fairly common and often used in 12V cig-socket converters for mobile pones, laptops etc. But there are many to chose from.

The datasheets typically give sample circuits including +/- supplies.

Posted By: DYohn
Date Posted: November 28, 2012 at 11:12 AM

The redneck way to do it would be wire three batteries in series and use a voltage divider. posted_image

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Posted By: oldspark
Date Posted: November 28, 2012 at 4:19 PM

Six batteries.
And no voltage divider.

Posted By: hadighorbani
Date Posted: November 28, 2012 at 9:02 PM

thanks

i try this even need 10 batteries. posted_image

i will search for a good smps shematic and share it to you

Posted By: oldspark
Date Posted: November 29, 2012 at 5:44 AM

Our multi-batteries referred to using 6 in series to get 72V - ie, +/- 36V. But that's useless - how will you charge them?

With dc-dc converters, you should only need one battery (12V). You then need an alternator capable of supplying the total load.
Extra batteries are only required if you want a dual battery setup with isolator to ensure you always have a cranking battery, and then extra secondary batteries if you want a longer reserve time for the amp when the engine is not running.

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