Welcome to the Piano World Piano Forums
Over 2.5 million posts about pianos, digital pianos, and all types of keyboard instruments
Join the World's Largest Community of Piano Lovers (it's free)
It's Fun to Play the Piano ... Please Pass It On!


SEARCH
Piano Forums & Piano World
(ad)
Virtual Sheet Music
Download Sheet Music Instantly
Virtual Sheet Music - Classical Sheet Music Downloads
Sheet Music...
(ad)
Accu-Tuner
Sanderson Accu-Tuner
(125ad)
Piano Life Saver - Dampp Chaser
Dampp Chaser Piano Life Saver
(ad)
Modern Piano Moving
Modern Piano Moving
(ad)
Piano Buyer Guide
Piano Buyer Spring 2017
(ad)
Lindeblad Piano
Lindeblad Piano Restorations and sales
Who's Online Now
108 registered members (Almaviva, agraffe, ajames, accordeur, alans, 21 invisible), 1,733 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
(ad)
Estonia Pianos
Estonia Pianos
Quick Links to Useful Piano & Music Resources
Our Classified Ads
Find Piano Professionals-

*Piano Dealers - Piano Stores
*Piano Tuners
*Piano Teachers
*Piano Movers
*Piano Restorations
*Piano Manufacturers

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano & Music Accessories
*Live Piano Venues
*Music School Listings
* Buying a Piano
*Buying A Acoustic Piano
*Buying a Digital Piano
*Pianos for Sale
*Sell Your Piano
*How Old is My Piano?
*Directory/Site Map
*Virtual Piano
*Music Word Search
*Piano Videos
*Virtual Piano Chords & Scales
Previous Thread
Next Thread
Print Thread
#2041386 - 03/01/13 03:35 PM Power Adapters for pianos and keyboards.  
Joined: Jul 2012
Posts: 6,165
peterws Offline
6000 Post Club Member
peterws  Offline
6000 Post Club Member

Joined: Jul 2012
Posts: 6,165
Northern England.
I have a new piano. Similar to the old one but the adapter supplied is a massive transformer thingy of 250V 2A capability, the AP6. The previous one was 1.5 A, the AP5D which was big enough, and recommended for the instrument I have now. But when I see these and others advertised, they seem to be for a multiplicity of Yamaha instruments, some big, some small. Indeed, some adapters seem no bigger than mobile phone chargers .. .

How critical is this? Does it matter if the adapter is a bit on the big side?


"I am not a man. I am a free number"

"[Linked Image]"
(ad) ROLAND

Click Here

#2041388 - 03/01/13 03:38 PM Re: Power Adapters for pianos and keyboards. [Re: peterws]  
Joined: Dec 2012
Posts: 282
adak Offline
Full Member
adak  Offline
Full Member

Joined: Dec 2012
Posts: 282
Canada
4 issues: As long as the voltage is within 5% of spec, and the amps is at least high enough as stated on the original adapter, and the plug is the same type, and the polarity is correct, then yes you can use any adapter.


Casio Privia PX-150

#2041400 - 03/01/13 03:49 PM Re: Power Adapters for pianos and keyboards. [Re: peterws]  
Joined: Dec 2012
Posts: 14
abitconfused Offline
Junior Member
abitconfused  Offline
Junior Member

Joined: Dec 2012
Posts: 14
If I had the choice I would prefer a larger power supply with a transformer in it to a smaller 'switched-mode' power supply (ie. the sort of thing you get with a mobile phone) for a piano or any audio device

The reason being that the 'chopping' of the waveform which a switch-mode power supply performs introduces all sorts of high-frequency signals (lookup 'step functions' and 'fourier analysis' if you want an explanation of why) into the power supply which can create issues with both the audio quality and the electronics if they are not properly filtered-out. Good power supplies are very important if you want good amplification

It's nothing to get too upset about and the smaller, switch mode power supplies normally 'work' fine, it's just you might notice your piano sounds a bit better with a larger, transformer-type PSU

#2041486 - 03/01/13 05:41 PM Re: Power Adapters for pianos and keyboards. [Re: peterws]  
Joined: Jul 2012
Posts: 6,165
peterws Offline
6000 Post Club Member
peterws  Offline
6000 Post Club Member

Joined: Jul 2012
Posts: 6,165
Northern England.
Thank you, both. The reason I asked was because, once on an outdoor location, I ran a Yamaha keyboard (PSR630 I think) through what I thought was a suitably connected car battery. Suitably connected through the adaptor input that is.

And it was never right since then . . . maybe "switch-on" was a bit too savage given the capacity of the battery, I don`t really know ..


"I am not a man. I am a free number"

"[Linked Image]"
(ad)
Piano & Music Accessories
piano accessories music gifts tuning and moving equipment
#2041493 - 03/01/13 05:49 PM Re: Power Adapters for pianos and keyboards. [Re: peterws]  
Joined: Nov 2010
Posts: 5,021
ando Offline
5000 Post Club Member
ando  Offline
5000 Post Club Member

Joined: Nov 2010
Posts: 5,021
Melbourne, Australia
Originally Posted by peterws
Thank you, both. The reason I asked was because, once on an outdoor location, I ran a Yamaha keyboard (PSR630 I think) through what I thought was a suitably connected car battery. Suitably connected through the adaptor input that is.

And it was never right since then . . . maybe "switch-on" was a bit too savage given the capacity of the battery, I don`t really know ..


Hang on, are you saying you connected this keyboard to the car battery through AC adapter? Or are you saying you bypassed the adapter and had the battery connected straight to the keyboard?

#2041498 - 03/01/13 05:54 PM Re: Power Adapters for pianos and keyboards. [Re: ando]  
Joined: Jul 2012
Posts: 6,165
peterws Offline
6000 Post Club Member
peterws  Offline
6000 Post Club Member

Joined: Jul 2012
Posts: 6,165
Northern England.
Battery straight to keyboard through the socket where the adapter usually goes. Well, it is 12V . . or maybe 13 or so. It worked.


"I am not a man. I am a free number"

"[Linked Image]"
#2041605 - 03/01/13 10:22 PM Re: Power Adapters for pianos and keyboards. [Re: peterws]  
Joined: Nov 2010
Posts: 5,021
ando Offline
5000 Post Club Member
ando  Offline
5000 Post Club Member

Joined: Nov 2010
Posts: 5,021
Melbourne, Australia
Originally Posted by peterws
Battery straight to keyboard through the socket where the adapter usually goes. Well, it is 12V . . or maybe 13 or so. It worked.


Ok, that sounds fine. A car battery will typically sit around 12.5V on a low current draw, so there's no reason that would cause any trouble. If you ran the battery down to a large degree, you might have problems though. A lot of electronic gear will not like a low voltage. It's equivalent to a "brown-out", which is what happens when your household electricity supply isn't cut off (blackout), but one or two of the phase lines to your local exchange is lost and your voltage drops to between 1/3 and 2/3 of normal. A lot of electronic circuits will fry if operated at low voltage for too long. It's possible something was damaged, but is partly functional in your keyboard and that's why it works but doesn't sound as good anymore.

#2041762 - 03/02/13 09:55 AM Re: Power Adapters for pianos and keyboards. [Re: ando]  
Joined: Jul 2012
Posts: 6,165
peterws Offline
6000 Post Club Member
peterws  Offline
6000 Post Club Member

Joined: Jul 2012
Posts: 6,165
Northern England.
Thanks Ando. The battery may well have run down a bit during THAT afternoon . . . !


"I am not a man. I am a free number"

"[Linked Image]"
#2044809 - 03/07/13 11:00 PM Re: Power Adapters for pianos and keyboards. [Re: peterws]  
Joined: Mar 2013
Posts: 5
Tom518 Offline
Junior Member
Tom518  Offline
Junior Member

Joined: Mar 2013
Posts: 5
New York, U.S.A.
A regular car battery has RAW power! It's meant to start a car and doesn't have any means of regulation, which most electronic devices need and use.
A plug in power supply has at the least a RL or small Pi filter in it after the bridge rectifier [if that is what it uses to change ac to dc] or it may use two diodes with a center tap for 12 volts.
A regulator would be ideal. A zener diode is a regulator of sorts.

#2044907 - 03/08/13 06:14 AM Re: Power Adapters for pianos and keyboards. [Re: peterws]  
Joined: Sep 2009
Posts: 5,082
MacMacMac Offline
5000 Post Club Member
MacMacMac  Offline
5000 Post Club Member

Joined: Sep 2009
Posts: 5,082
North Carolina
A standalone car battery will work fine. Most devices don't need tight regulation at all. And the battery's voltage will remain reasonably constant until it drains significantly.

But what does it matter? The OP is asking about power supply adapters, not car batteries.

#2045151 - 03/08/13 04:59 PM Re: Power Adapters for pianos and keyboards. [Re: Tom518]  
Joined: Jul 2012
Posts: 6,165
peterws Offline
6000 Post Club Member
peterws  Offline
6000 Post Club Member

Joined: Jul 2012
Posts: 6,165
Northern England.
"A regular car battery has RAW power! It's meant to start a car and doesn't have any means of regulation"

Tis is what I`m getting at. The initial power surge when the switch is operated. Like a pressurised mains water supply whooshing into an empty pipe system until it pressures up . . . And components which may be compromised somewhat because of it. Like a reduced life . . .The same principle for adapters, too.


"I am not a man. I am a free number"

"[Linked Image]"
#2045177 - 03/08/13 05:57 PM Re: Power Adapters for pianos and keyboards. [Re: peterws]  
Joined: Sep 2009
Posts: 5,082
MacMacMac Offline
5000 Post Club Member
MacMacMac  Offline
5000 Post Club Member

Joined: Sep 2009
Posts: 5,082
North Carolina
Much ado about nothing.

A battery is the smoothest source of power.
It has no need for regulation.
And if there is any power surge when the equipment is turned on, it has NOTHING to do with the battery.

#2045254 - 03/08/13 09:21 PM Re: Power Adapters for pianos and keyboards. [Re: MacMacMac]  
Joined: Mar 2007
Posts: 744
LesCharles73 Offline
500 Post Club Member
LesCharles73  Offline
500 Post Club Member

Joined: Mar 2007
Posts: 744
Denton Texas
Originally Posted by MacMacMac
But what does it matter? The OP is asking about power supply adapters, not car batteries.


Originally Posted by peterws
Thank you, both. The reason I asked was because, once on an outdoor location, I ran a Yamaha keyboard (PSR630 I think) through what I thought was a suitably connected car battery. Suitably connected through the adaptor input that is.

And it was never right since then . . . maybe "switch-on" was a bit too savage given the capacity of the battery, I don`t really know ..


Well, he sort of asked about car batteries.

A few points I would add:

Car batteries are unsuitable for continuous use between charges. When the voltage starts dropping (battery drain), you could experience erratic or unstable behavior. This could damage the instrument if it is not designed to deal with this. Use a deep cycle marine battery instead. They are designed to hold a constant charge longer, and can take more abuse when it comes to being run 'dry'.

A raw battery is not fused. Your keyboard may be - or it may not be. Either way, I would make sure there is a fuse somewhere in the equation. If you instead connect the battery to a power inverter, and plug the piano (with its factory power supply) in to that, you would get your fused circuit. However, some inverters spit out some serious chopped sine waves, which some electronics absolutely hate.

Consult the factory if your instrument is under warranty as any of this could void it.

Last edited by LesCharles73; 03/08/13 09:23 PM.

Les C Deal





Moderated by  Piano World 

Piano Acc. & Gift Items in
Piano World's Online Store
In PianoSupplies.com ,(a division of Piano World) our online store for piano and music gifts and accessories, party goods, tuning equipment, piano moving equipment, benches, lamps Caster Cups and more.


Free Shipping on Jansen Artist Piano Benches
ad
Pierce Piano Atlas


(ad)
Pianoteq
Grotrian Concert
Royal
for Pianoteq out now
(ad)
A. Geyer Pianos
A. Geyer Pianos
What's Hot!!
Why Do You Play The Piano?
-------------------
Posting Pictures on the Forums
-------------------
Forums RULES & HELP
-------------------
ADVERTISE on Piano World
-------------------
Piano Classified Ads
New Topics - Multiple Forums
State of Continuous Pedaling with DPs
by Rador. 05/22/17 07:25 PM
Kawai VPC1 to control MP7?
by phosita. 05/22/17 05:51 PM
Scarlatti repeated notes
by estelleroux. 05/22/17 02:32 PM
Light out on RD800
by Averasboro. 05/22/17 02:20 PM
Casio GP 300vs400vs500
by Nordomus. 05/22/17 01:54 PM
(ad)
Sheet Music Plus
Sheet Music Plus Featured Sale
Forum Statistics
Forums44
Topics179,819
Posts2,628,856
Members87,843
Most Online15,252
Mar 21st, 2010
Report Problems With New Forums
Report Problems with New Forums Here!
Visit our online store for gifts for music lovers

 
Help keep the forums up and running with a donation, any amount is appreciated!
Or by becoming a Subscribing member! Thank-you.
Donate   Subscribe
 
Our Piano Related Classified Ads
| Dealers | Tuners | Lessons | Movers | Restorations | Pianos For Sale | Sell Your Piano |

Advertise on Piano World
| Subscribe | Piano World | PianoSupplies.com | Advertise on Piano World |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter |


copyright 1997 - 2017 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission
Powered by UBB.threads™ PHP Forum Software 7.6.0