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My Pico is doing something extremely bizarre!! aka("The Pico Petting Thread"-ed)

post #1 of 47
Thread Starter 
Ok, so my Pico showed up in the mail today and I got about 7 hours of listening in then I decided to plug it into the charger. So I've got it plugged into my Ipod via line out and my Ah-d2000's and anytime I rub my fingers/hand anywhere on the Pico it starts to vibrate. At first it felt like an electronic motor that can't spin so it vibrates instead (closest thing I can think of). I thought I was going crazy at first so I pull the cans off and try it again, this time I realize that the Pico isn't really vibrating on it's own but instead it's magnifying the subtle sticking then releasing of my skin against it's finish. It's almost as if the vibration of my fingers rubbing against it's surface is matching the resonant frequency of whatever is charging the battery(only happens when it's plugged in). This odd vibration happens whenever it's plugged in (DC) audio cables or the amp being on or playing doesn't effect the vibration. It's hardly subtle either and could be immediately felt by my brother (who didn't find it as odd as I?) but this vibration isn't audible at all through the cans or if I put my ears to the Pico.

Has anyone else experienced this with their Pico or any other electronics? I definitely have never felt anything like this in my life.
post #2 of 47
You're talking about the "Pico Purr" then.

Yeah, I felt the same thing. I thought I was imaging it at first. I think it's just the aluminum body resonating as I stroked it. Partly to do with the body being polished finish.

Of course now I'm stroking my Pico now and it's not purring for me. Hmmm. Strange perhaps I haven't been using my Pico enough lately?

LOL, is this thread going to turn into a Pico Fetish Thread?

-Ed
post #3 of 47
Mine won't purr either. I hope my wife doesn't catch me stroking my pico...could make for an awkward situation.
post #4 of 47
Grounding issue, I'd say. I have observed the same with the Move when it is connected to the iPod at home on the table, but not when it is connected via USB (which effectively grounds the amp via the PC). I never feel it when I am on the move, most probably because my rubber-soled shoes would not let any static through.

Cheers!
post #5 of 47
Well that sounds like a design flaw. Perhaps Justin should look into this.

January, Headphone Amp.
February, Mexican Jumping Bean.
post #6 of 47
Quote:
Originally Posted by GreatDane View Post
Mine won't purr either. I hope my wife doesn't catch me stroking my pico...could make for an awkward situation.
Just rub your Pico and whisper so she can hear "Yess, my precious", at that point she will probably stare for a bit then slowly back away. Least she wont say anything
post #7 of 47
Quote:
Originally Posted by Ricey20 View Post
Just rub your Pico and whisper so she can hear "Yess, my precious", at that point she will probably stare for a bit then slowly back away. Least she wont say anything
lol That's a very accurate guess..she leaves me alone with my headphone geekness.

I had mine connected to my PC via USB so I'll agree with Zorander. I also have the AC adapter plugged into a Trip-Lite isolation transformer so that could help too...don't know.
post #8 of 47
Wow this is the first time I've heard of people stroking their amps.

Well im off to stroke all my amps to see if they start purring.
post #9 of 47
It happens also on my Hornet whenever the DC-in is plug in.
post #10 of 47
not a design flaw, my macbook pro does the same thing when it is plugged in and I lightly drag my fingers across the top of it on either side of the track pad. I just thought it was a ground thing too.
post #11 of 47
Quote:
Originally Posted by basman View Post
It happens also on my Hornet whenever the DC-in is plug in.
x2
post #12 of 47
sounds like some electrons are escaping here and there. happens often in different electronics - what it is called and why, I have no idea
post #13 of 47
I definitely have to admit that these forums really have their golden lol moments.

People stroking their amps... oh my... time to dance, everyone!

post #14 of 47
Quote:
Originally Posted by shigzeo View Post
sounds like some electrons are escaping here and there. happens often in different electronics - what it is called and why, I have no idea
You will find it in some of the posts above. In fact, I am one of those who typed it.
post #15 of 47
There are quite a few things vibrate... I wonder what caused the Pico vibrates, too ?
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Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › My Pico is doing something extremely bizarre!! aka("The Pico Petting Thread"-ed)