ProSoundWeb Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: [1]   Go Down

Author Topic: Street Performer AC Power  (Read 2435 times)

Mike Sokol

  • Moderator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 3330
  • Lead instructor for the No~Shock~Zone
    • No~Shock~Zone Electrical Safety
Street Performer AC Power
« on: October 04, 2014, 05:34:40 pm »

This is a very cool street performer clip that's musically great and a little sad at the same time. My guitarist Karl sent it to me, but nobody on his facebook page noticed the car battery and tiny inverter powering the piano. Yeah, I'm sure there's no G-N bond, and there's nary a ground rod is sight. But I'm pretty sure the performer is safe from electrocution unless they could somehow get across the hot and neutral wires which doesn't look likely. And you certainly don't want to get a screwdriver across the 12-volt battery terminals since that would be a big arc. Still, I'm sure this kind of setup has been used many times before.

 http://www.youtube.com/watch?v=s3PGNnG1OGw&feature=youtu.be

 
Logged
Mike Sokol
mike@noshockzone.org
www.NoShockZone.org

Frank DeWitt

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 987
    • LBP DI Box
Re: Street Performer AC Power
« Reply #1 on: October 04, 2014, 07:09:46 pm »

It is interesting that that piano uses a 9 volt 2 amp line lump.  12 volt to 120 volt to 9 volt.  Perhaps a better way.
Logged
Not to Code

jasonfinnigan

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 329
Re: Street Performer AC Power
« Reply #2 on: October 04, 2014, 08:51:17 pm »

I think with out the loss from an inverter he could've gone with a DC battery pack that is regulated. Even something like this may do the trick: http://www.amazon.com/XTPower-10000mAh-Recorders-Sensation-Connectors/dp/B00935L44E#

Or there's always anton bauer
Logged

Mark Cadwallader

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1164
  • Helena, Montana USA
Re: Street Performer AC Power
« Reply #3 on: October 04, 2014, 09:24:18 pm »

Pretty hard to get a screwdriver to touch both terminals on that motorcycle battery, IMHO. Mark C.
Logged
"Good tools are expensive, but cheap tools are damned expensive."

Mike Sokol

  • Moderator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 3330
  • Lead instructor for the No~Shock~Zone
    • No~Shock~Zone Electrical Safety
Re: Street Performer AC Power
« Reply #4 on: October 04, 2014, 09:40:44 pm »

Pretty hard to get a screwdriver to touch both terminals on that motorcycle battery, IMHO. Mark C.

I wonder how long it would run this rig. Looks like a 400 watt inverter to me. Of course the piano would only draw a few dozen watts I would think. I didn't see a power amp, so that could eat up the power real quick. Most of the battery power would probably be spent on inverter and wall-wart losses.
Logged
Mike Sokol
mike@noshockzone.org
www.NoShockZone.org

Mark Cadwallader

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1164
  • Helena, Montana USA
Re: Street Performer AC Power
« Reply #5 on: October 04, 2014, 11:37:41 pm »

Probably not more than 25 AH (which is what my older BMW R100 uses).  Mark C.
Logged
"Good tools are expensive, but cheap tools are damned expensive."

Stephen Swaffer

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 2127
Re: Street Performer AC Power
« Reply #6 on: October 05, 2014, 05:11:15 pm »

Most of the battery power would probably be spent on inverter and wall-wart losses.

Seems like a poor plan to convert to 120vac when the gear really needs and utilizes lower voltage dc-which would virtually eliminate electrocution hazards, and G-N bonding questions-then too I am thinking DC "hum"would be a lot less annoying than 60 hz hum if something went awry :)
Logged
Steve Swaffer

Mike Sokol

  • Moderator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 3330
  • Lead instructor for the No~Shock~Zone
    • No~Shock~Zone Electrical Safety
Re: Street Performer AC Power
« Reply #7 on: October 05, 2014, 05:31:26 pm »

Seems like a poor plan to convert to 120vac when the gear really needs and utilizes lower voltage dc-which would virtually eliminate electrocution hazards, and G-N bonding questions-then too I am thinking DC "hum"would be a lot less annoying than 60 hz hum if something went awry :)

Very true, but consider how little the average person knows about AC, DC, Voltage, Current, etc... So with no real understanding about electricity they would deal with the problem by plugging together things they can buy from Radio Shack. If it works at all then it's considered a success.     
Logged
Mike Sokol
mike@noshockzone.org
www.NoShockZone.org

Scott Holtzman

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 5131
  • Ghost AV - Avon Lake, OH
    • Ghost Audio Visual Systems, LLC
Re: Street Performer AC Power
« Reply #8 on: October 05, 2014, 09:50:42 pm »

LM317 still stocked at rat shack.  If I saw her and had time I would have bought a little project box. Could have even put a gas gauge on it.
Logged
Scott AKA "Skyking" Holtzman
River Delta Audio is now:

Ghost Audio Visual Solutions, LLC
Cleveland OH
www.ghostav.rocks
Pages: [1]   Go Up
 


Page created in 0.071 seconds with 22 queries.