Hi all,

I am planning on building a circuit that convert the output of my portable charger (5V 2A) to charge by portable speaker (20V 1.2A)

was hoping someone had done something similar or could help me

Thank you!

 

So you want to take something that outputs at most 10 W of power and use it to charge something that requires 24 W of power?

 

So you want to take something that outputs at most 10 W of power and use it to charge something that requires 24 W of power?

I believe so, yes

 

If so, then what you are asking for can't be done. So don't waste your time trying. It's like saying that you have a water hose that outputs 10 gallons per minute and you want to know how to use it to fill your 50 gallon bathtub in 2 minutes.

 

You can get a DC to dc converter for 5 to 20V, but your current output will be less than 0.5A.

You won't get more out than you put in!!

 

hi Luke,
As Dd says, 20V at ~0.5A, so to recharge a portable speaker 1.2Amp battery, approx (1.2A/0.5A) /0.7 ,would take 3.5Hrs.
E

 

10 watts is all you have to work with..
Watts = Volts x Amps
So you can have 10V @1A or 1V @10A or 5V @2A but they all must equate to 10W and in the real life any conversion has some losses associated with it so you really have like 9.6W to work with or so..