-12v +12v from same power source?

[jhaneyzz]

This is probably a totally noob question, but I couldn't find the answer in search.

Is it possible to supply -12 +12 voltage to an amp from a single 12v BATTERY source?

-James

 

[adason]

it is, there are many ways to do it, but its not going to be very efficient...you can have 12 volt DC convert to 120 volt AC, and then you use proper transformer to create +/- 12 volt DC...

converters...
https://www.walmart.com/c/kp/12v-power-inverter

second option is DC to DC converter...
https://www.automationdirect.com/ad...C_Converters?gclid=CJr8ldm1kc8CFUpahgodWLAGWw


third option is to use another battery...

 

[wwenze]

Use a DC to negative DC converter

like this

12V Negative Voltage Daul Power Supply LM2596 12V to ±12V DC Converter 3A | eBay

you can have 12 volt DC convert to 120 volt AC, and then you use proper transformer to create +/- 12 volt DC...

Lol no please.

 

[cacao ambiance]

YJ sell this 12V (but i also know that 4S li-ion batt at 16.8V is within its range/under its maxV ) DC BOOST but its for 45v +/- https://www.yuan-jing.com/Voltage-Converter/12v-to-45v-dc-to-dc-converter-500w I would also like to know if there something that will reduce the 45V +/-DC voltage to 12 or 15v +/-DC for +/-DC pre-amp boards.

 

[easphyx]

You can use inverting charge pump. Look at example.

 

[Osvaldo de Banfield]

The IC ICL7660 or 7662 can convert a positive supply into a negative, but at low power. It is used extensively in industrial environments and very easy to use, only 2 capacitors needed.

 

[easphyx]

The IC ICL7660 or 7662 can convert a positive supply into a negative, but at low power. It is used extensively in industrial environments and very easy to use, only 2 capacitors needed.

And don't forget to place output filter

 

[easp]

How much current? Is this relatively low power, like for an op-amp, or a dual-supply pre-amp circuit; or is it for a power amp where both rails may need to deliver significant power?

 

[Osvaldo de Banfield]

https://www.intersil.com/content/dam/Intersil/documents/icl7/icl7662.pdf

Simplest, impossible.

"And don't forget to place output filter"

May or may not be necessary, for op amps with good PSRR, is not mandatory. Use good tantalum caps only, and short traces in your PCB.

 

[jhaneyzz]

wwenze:
This looks ideal to my needs.


easp:
Well, I am assessing various components for my next portable boom box. Some of the pre-amps and power amps require dual rail power. Not being familiar with how that works I am just looking to learn.

What concerns should I have about driving a power amp?

-James

 

[turk 182]

to answer your original question not easily, but if you need + and - 12 vdc why not series connect two batteries (or supplies)?

 

[jhaneyzz]

Because I know very little about electricity???

 

[gofar99]

The Meanwell dc to dc converters will do this ones like DCW05A-12. It will deliver about 300ma to both + and - 12 volt outputs. Input is 9-18 VDC. Small, and work well. Mouser and Jameco carry them.

 

[gmarsh]

How much current do you need at +-12V? Lots of possibilities.

Also, are you looking for something you're designing into a PCB, or a discrete module with terminal blocks or something?

 

[jhaneyzz]

gmarsh:
Definitely an individual unit.

 

[turk 182]

have you had time to study up on series and parallel power sources?

 

[JMFahey]

If you need to feed a power amp which needs +/- 12V rails at a couple amperes, you may build a power inverter ... and in that case why limit yourself to +/- 12V? you may choose way higher rails which will let you use practically any power amp you wish.
That´s what car amps do, they often go from, say, +/-25V to hairy +/- 70V .

 

[us1070]

Just the basic again:
Use 2 batteries connect battery 1+ on Batter 2- with a wire this will make ground. So now you will have 3 powers GND, Positive and Negative

OP want from single battery only.

 

[jhaneyzz]

US1070:

Sorry that really didn't make any sense to me.