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Author Topic: Street Performer AC Power  (Read 4221 times)

Mike Sokol

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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

 

Frank DeWitt

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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.
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jasonfinnigan

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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
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Mark Cadwallader

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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.
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Mike Sokol

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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.

Mark Cadwallader

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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.
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Stephen Swaffer

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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 :)
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Mike Sokol

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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.     

Scott Holtzman

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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.
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Scott AKA "Skyking" Holtzman

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Re: Street Performer AC Power
« Reply #8 on: October 05, 2014, 09:50:42 PM »


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