Can I get some help in understanding the power supplies and grounding/electricity?

[BaylorPRSer]

Hi there,

 

So I have a few scenarios where I'm getting shocks from my guitar when it is plugged into my POD HD500x and/or my laptop.  

 

My recording setup is the POD HD500x, 2 external pedals in FX loop, 2 quarter inch guitar cables going from the POD into a Focusrite 2i2 interface, which is connected to a Windows 11 laptop via USB.

 

https://www.electricalsafetyfirst.org.uk/guidance/advice-for-you/when-travelling/travel-adaptor-for-vietnam/

 

I live in Vietnam, which according to the above, runs on a 220V supply voltage and 50Hz.

 

All of the chargers read 100V-240V and 50-60Hz in their input section.

 

 

There are 4 power supplies in question:

1) a 2-pronged power supply that came with the POD HD500x.  I don't get shocked as long as this is the only power supply in the equation.  Input: 100-240V ~ 50/60Hz   1.0A 

Output: 9.0V -3.0A

Attached Image: Power Supply #1

 

2) A 2-pronged power supply that is compatible with both my POD and the 2 external pedals.  This causes shocks when it's powering the POD and/or when it's powering one of the pedals in the FX loop.

Input: 100-240V ~ 0.6A; 50/60Hz

Output: 9V - 2A    50VA

Attached Image: Power Supply #2

 

3) A 2-pronged power supply that is compatible with the 2 external pedals, but not the POD.  This causes shocks when it is powering a pedal in the FX loop.

Input: 100-240V ~ 50/60Hz   0.35A

Output: 9V - 1700mA(Max.)

Attached Image: Power Supply #3

 

4) A 3-pronged laptop charger that causes shocks when my guitar is plugged directly into the interface, and also when my guitar is plugged into the HD500x, which is connected to the interface via quarter inch guitar cables.  When I unplug the charger (not an option unfortunately as my laptop's battery is very low, and I can't for the life of me find a replacement here), the shocks disappear.

Input: 100-240V ~ 1.4A    50/60Hz

Output: 19.5V - 2.31A

Attached Image: Laptop Charger

 

 

Just about all the electrical outlets in this country are 2-holed, so I have to use a power strip that features 3 holes for the laptop charger.

 

The shocks happen with the 2-pronged chargers regardless of whether or not they are plugged into the wall or the power strip.

 

I've received shocks in 2 different cities, and with 2 different power strips.  

 

I've read that being barefoot makes one more grounded, and while I need to do more troubleshooting wearing sneakers, this does seem to make a slight difference.

 

When I rub my finger over the metal handle on the POD HD500X in the scenarios where I'm getting shocks, I feel vibrations.  When I rub my finger over the metal handle when only power supply #1 is involved, I feel a much subtler vibration.

 

Given that the voltage range and HZ is fine for all the chargers, is it the number of amperes that I should focus on?  The output value? 

 

Are 3-pronged chargers simply a no go? 

 

Can anyone confirm that wearing sneakers does in fact decrease the likelihood of shocks?

 

Is it normal to feel vibrations in metal chunk of the POD when it's plugged in?  To recap, it's a subtle vibration when using the line 6 power supply, and a more intense vibration when the other power supplies are involved.

 

The shocks are annoying, but certainly not painful enough to demotivate me from using the setup.  If worse comes to worst, and I cannot find a combination of power supplies/chargers to get rid of the shocks, is it safe to proceed?