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I was just electrocuted!

May 27, 2022
154
248
Hey guys,

So I know I’m going to get tarred and feathered for this but here goes….

I live in China and the wiring in apartments can sometimes be…. problematic. That aside, here’s what happened.

So I have a small setup in my spare room and….. yes, I have literally everything going into one wall outlet. I have my laptop, mixing desk, pedalboard, monitors, synth and Nord electro (usually not all at once but most of them are usually powered up at one time).

That alone is idiotic, I know, but I’ve never had any issues with it…. until today.

So I recently got a new power brick (secondhand trex chameleon from a friend) and so also picked up a knock-off cali76 (when in China, it does sound great though). I was going from bass > compressor (plugged into a 9v two-pronged adapter) > mixing desk. My laptop was also plugged into along with the monitors, everything else was unplugged.

I usually get some hum when I’m not touching the bass (the bass in question was a battered squire jazz I bought off a mate and it’s all beat up to hell but works well enough usually), but this evening, it suddenly was buzzing pretty loud, so I went to touch the bass and bang, it shocked me pretty fierce.

So I powered the wall adapter off (it’s just a big standard adapter, no surge protection) and decided to plug my power brick into the adapter to see if using an isolated power supply would change things. I switched it to 18v (chameleon has the option to do that). Powered everything up again and it’s seemed marginally quieter but still louder than usually. Bang, I got it again.

So now I’m sitting here wondering what the issue is. Yes, I’m a plonker for having so many things plugged into one outlet but I’ve done things that way for the last 6 months. Is it possible the bass isn’t grounded properly? Is my new knock-off cali76 the culprit (it’s been fine since I got it last week, do pedals need to be grounded? I thought the chameleon would fix that issue). I’m at a loss, but I would like to figure it out, otherwise I can’t do anything with my studio. There is only one outlet in that room.

anyway, long ramble but I figured the more info, the better. I guess I could try with my suhr and that would answer if the problem is the bass but I figured I’d ask here before getting shocked again (it’s not fun).

Thanks in advance (and apologies if there are typos, I’m on my phone)
 
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You got zapped touching the strings?? What's the chain, from power outlet to the bass?

My first thought is kill the power completely, check outlet wiring. Maybe something came loose from plugging/unplugging?
Wall outlet > multi plug adapter > power brick plugged into that > compressor at 18v > bass (along with my laptop, mixing desk and monitors all going into that same adapter coming off the wall outlet)
 
Yeah, it could be that. But I was just powering the compressor with a 9v two pinned adapter when it first happened. I plugged in the power brick just to see if using an “isolated” supply would change anything….. it did not, haha
Yeah, I just figured it was the newest piece to the puzzle. You should be able to eliminate 1 item at a time and find the culprit….
 
If you are getting ANY sort of shock from your gear, you need to identify the culprit NOW! Do you possess a multimeter? Do You know how to use it? Is the power point wired correctly? Amateurs have been known to reverse polarities on power points, which places the Active to ground, and can cause all sorts of issues with poorly insulated equipment. From there on, I'd be connecting one device at a time to try and identify the culprit. A decent amp should not be passing any high voltage through to the instrument, and, I'm guessing that you pedals are all low voltage devices. (9V DC is common). If you need to see if the strings on your instrument are still powered touch with the BACK of your hand. An electric shock tends to cause constriction of your muscles so placing the back of your hand on a suspect circuit will tend to make you flinch AWAY from the charge rather than grip onto it with potentially fatal consequences.

Edit: IIRC China runs 220V
 
Someone said get a multimeter - YES. If you don't know how to use one, find a friend who does. This reminds me of something from my teenage years. In the 60s, amps didn't always have grounded power cords and I got my share of shocks. We went to visit another kid playing guitar in his basement. He said watch this. He lifted the guitar close to the furnace ductwork in the ceiling. A big blue spark appeared as the power jumped to the string end on the tuning machine.