9v DC input with a 12v DC PSU

Author
Post
Essentials Only Full Version
Scoot
Max Output Level: -73 dBFS
  • Total Posts : 875
  • Joined: 2007/06/29 13:53:59
  • Location: Da Nang, Vietnam
  • Status: offline
2012/07/17 16:11:23 (permalink)

9v DC input with a 12v DC PSU

Should I worry, or will it be fine

HP ENVY Notebook - 15t-k100 CTO i7 -4510U CPU @ 2.00 GHZ 8gb RAM. Windows 8.1 64bit Full HD Touchscreen
Sonar X3 Producer, AAS Complete set, XLN AD Keys and Drums, TH2
Roland Quad Capture, AudioTeckina 3035 Mic and ATH-M50 Headphones.
Korg Nanopad2, WX5 Midi Sax, , Soprano Sax, Alto and Soprano Flute, Acoustic Guitar and Epiphone Dot
 
          Scoot not scook
#1

6 Replies Related Threads
    Beagle
    Max Output Level: 0 dBFS
    • Total Posts : 50621
    • Joined: 2006/03/29 11:03:12
    • Location: Fort Worth, TX
    • Status: offline
    Re:9v DC input with a 12v DC PSU 2012/07/18 08:55:19 (permalink)
    it depends on what the device is and how it was designed.

    it's also important to know what the amp requirements of the device are and how many amps the power supply can provide.

    personally I would not mis-match power supplies with devices.  a lot of times it won't cause problems, but on the occassion it does - why risk it?

    http://soundcloud.com/beaglesound/sets/featured-songs-1
    i7, 16G DDR3, Win10x64, MOTU Ultralite Hybrid MK3
    Yamaha MOXF6, Hammond XK3c, other stuff.
    #2
    NW Smith
    Max Output Level: -79 dBFS
    • Total Posts : 565
    • Joined: 2006/05/08 16:01:48
    • Location: Seattle, USA
    • Status: offline
    Re:9v DC input with a 12v DC PSU 2012/07/18 09:42:13 (permalink)
    I agree with Beagle. I would not mis-match power supplies. A 9 volt supply is rather common - so I would get one to be safe.

    My Website:
    http://www.marwoodwilliams.com
    My Music on Bandcamp:
    http://marwoodwilliams.bandcamp.com

    Equipment: Intel Core i3, 3.2 GHz, Sonar Platinum, Ramsa WR-S4416 Mixer,  Focusrite  Scarlett 18i6
    #3
    Scoot
    Max Output Level: -73 dBFS
    • Total Posts : 875
    • Joined: 2007/06/29 13:53:59
    • Location: Da Nang, Vietnam
    • Status: offline
    Re:9v DC input with a 12v DC PSU 2012/07/18 10:03:49 (permalink)
    Both PSU and Trigger finger are 500mA

    Just trying to get rid of the sea of cables. I tend to have my midi cable and psu cable for my wind synth cable tied togther, to stop them tangling. As I never play the Trigger finger and wind controler together, at the moment, presents and easy solution in unplugging one and attaching the other 

    HP ENVY Notebook - 15t-k100 CTO i7 -4510U CPU @ 2.00 GHZ 8gb RAM. Windows 8.1 64bit Full HD Touchscreen
    Sonar X3 Producer, AAS Complete set, XLN AD Keys and Drums, TH2
    Roland Quad Capture, AudioTeckina 3035 Mic and ATH-M50 Headphones.
    Korg Nanopad2, WX5 Midi Sax, , Soprano Sax, Alto and Soprano Flute, Acoustic Guitar and Epiphone Dot
     
              Scoot not scook
    #4
    Jeff Evans
    Max Output Level: -24 dBFS
    • Total Posts : 5139
    • Joined: 2009/04/13 18:20:16
    • Location: Ballarat, Australia
    • Status: offline
    Re:9v DC input with a 12v DC PSU 2012/07/18 18:41:24 (permalink)
    What often happens is that your external power supply will feed into some sort of voltage regulator inside the unit you are powering up. The voltage the comes out of the regulator (and feeds the internal circuitry) will often be little lower than the voltage going in. The difference in voltage going into the internal regulator and coming out of the internal regulator will be smallish and is turned into heat but the regulator is usually designed to cope with that.

    But when the voltage going into the regulator is a lot higher than 9 volts what happens is that the internal regulator will still output the same voltage as it did before (into the circuitry) except now there is a much larger voltage difference across the regulator and as result it will get hotter and could fail under the extra heat is has to dissipate. You are straining the internal regulator now.

    So best to feed in the correct DC voltage that is being asked for. Many 9 volt power supplies actually put out a higher open circuit voltage than 9 volts so the internal regulators are often dealing with a slightly higher than normal input voltage anyway. Why make it worse with a higher voltage supply. eg a 12 V DC supply could be putting out 15 volts or more open circuit. 

    With current ratings feeding a device that requires 500mA with a power supply that is only rated at 500mA also is not a great idea either. You will find the power supply might get a bit hot under these conditions. If I needed to supply 9 volts at 500 mA I would use a power supply rated at 9 volts but closer to 1A for extra current. Then it would only run luke warm which is a better option. A lot of the newer switchmode DC supplies these days are excellent and can supply very regulated voltages at quite high currents and run very cool at the same time.


    post edited by Jeff Evans - 2012/07/18 18:45:31

    Specs i5-2500K 3.5 Ghz - 8 Gb RAM - Win 7 64 bit - ATI Radeon HD6900 Series - RME PCI HDSP9632 - Steinberg Midex 8 Midi interface - Faderport 8- Studio One V4 - iMac 2.5Ghz Core i5 - Sierra 10.12.6 - Focusrite Clarett thunderbolt interface 
     
    Poor minds talk about people, average minds talk about events, great minds talk about ideas -Eleanor Roosevelt
    #5
    Scoot
    Max Output Level: -73 dBFS
    • Total Posts : 875
    • Joined: 2007/06/29 13:53:59
    • Location: Da Nang, Vietnam
    • Status: offline
    Re:9v DC input with a 12v DC PSU 2012/07/18 19:37:14 (permalink)
    Cool thanks for the explanation. I used to run a whole load of rackmount synths, so used to have a stake of these for different voltage, ampages and AC/DC outputs, and would put coloured stickers on them. Some weren't the originals, so was often a case of if this one works with that, then I went with it. I rarel had a falure and where I did it was the PSU, and never the device. But as this happened with the original manufacturer matched supply, I've not had any real indictation to get an idea.

    The device is meant to able to run on USB, but there's a conflcict going on, I seem to get more issues trying to run it with the external soundcard, which obviosuly takes priority. Sometimes it's not being recognised as a device, but I have a keyboard that uses the same m-audio drivers and that works fine. When it is being recognised, it's not outputting midi, so the usb can suply the power, and I can connect the midi out to the soundcards midi in, and that works fine. I happen to be short on usb inputs, so decided on giving up on the useb and treating as a midi device using midi and and a PSU, that means the keyboartd can stay perminantly plugged in and all is sorted.

    I did some reading on USB today.  USB is lower than 9v so clearly it's having to deal with 9v as more than enough as it is. I guess as you say, it's probably regulationg that down to the same as USB or thereabouts.

    I'll get a PSU as advised. Thanks

    HP ENVY Notebook - 15t-k100 CTO i7 -4510U CPU @ 2.00 GHZ 8gb RAM. Windows 8.1 64bit Full HD Touchscreen
    Sonar X3 Producer, AAS Complete set, XLN AD Keys and Drums, TH2
    Roland Quad Capture, AudioTeckina 3035 Mic and ATH-M50 Headphones.
    Korg Nanopad2, WX5 Midi Sax, , Soprano Sax, Alto and Soprano Flute, Acoustic Guitar and Epiphone Dot
     
              Scoot not scook
    #6
    Cactus Music
    Max Output Level: 0 dBFS
    • Total Posts : 8424
    • Joined: 2004/02/09 21:34:04
    • Status: offline
    Re:9v DC input with a 12v DC PSU 2012/07/22 23:36:25 (permalink)
    Some devices seem to be protected and others are not. I fried a most excellent Korg Poly 800 ( worth $1,200 at the time) in 2 seconds flat when I used the wrong wall wart by mistake. I always figured they should make the ends so they will or won't fit and standardize them. I have always stayed with using a Boss Power supply for all my 9 volt pedals. Why take a chance.

    Johnny V  
    Cakelab  
    Focusrite 6i61st - Tascam us1641. 
    3 Desktops and 3 Laptops W7 and W10
     http://www.cactusmusic.ca/
     
     
    #7
    Jump to:
    © 2024 APG vNext Commercial Version 5.1