Chord Hugo power supply help

@elevick

So you think the charging current is intended to be limited by the power supply.

That’s an interesting supposition!

Could be. That would be a little too well integrated for my tastes, but evidence of some pretty slick cost savings from the designer.


E

@Kalali

So technically the specified current is the minimum. 

Doh, so close, you had it all right until then. :)

For the wall wart, the A specified is the maximum it will deliver without dropping V, or shutting down or overheating. At or below the A rating, it will provide the voltage rated.

For an electronic device, A is always the maximum drawn during operation.For instance, this Parasound amplifier:

http://www.parasound.com/a23+.php
Would have 800 W marked on the chassis, but as you can read in the specs, the standby and idle power are a lot less.

So, to re-word your statement:

So technically the specified current implies the minimum R of the device

Yes, it does. If R is larger, then I will drop.

@kalali

Yes, you could use a 100A supply on the device and the Chord would be safe. Let me help you understand why.

Your math is right, but you miss that current (I or A) is dependent on V and R. It's not the other way around.

We can induce the R based on the device rating. The device is rated at 0.5 Amps, that means the maximum current will be 0.5, in reality it will vary, but lets assume max.

R = 12 / 0.5 = 24
So we can assume the minimum R will be 24. So ....

I = 12 / 24 = 0.5
Having a power supply capable of 1,000 A still doesn't change the equation. The current will depend on V and R.

So, if you can't change R (the device) the only way to increase I is to increase the V. So, if you attached a 24V supply, THEN you'd have too much current and risk the device.

Hope this helps,
E

Based on the website, 12V, 0.5 A will work. If you like to leave it plugged in, this is a very nice options:

https://amzn.to/2rQtNiZ

If you want something absolutely killer though ....

https://amzn.to/2LxI6SG

You would have to roll your own power cable though, it has banana jacks on the back.

Well, aside from buying from Hugo, iFi makes some very nice audiophile wall warts.

Check the current requirements. The Hugo should have something on it like "12 V 1.5A" or something. Make sure V are the same, and that your power supply A is equal or greater than what Hugo wants.

Best,
E