What is power supply?

You need to find out first the PIN assignments (you have 4 pins) from the diagram of your unit. Try find a manual from the system manufacturer website. This way we can be able to understand which is the +/- (polarity) and requires the 20V input. Maybe you only need to tap from 2 wires in it, then the remaining wires can be just a signal or voltage sensing.

A variable power supply might be able to help and you can find it in Radioshack or similar electronic or DIY stores. These types of power supply only has "2-pins" however, but will allow you to select voltage and polarity for your needs.

Stop!

There are no voltage and amperage "standards" for low voltage connectors found on devices made to run from an external "wall wart" or transformer type charger or adapter. Just because a connector "fits" does not mean the power is 1) the correct voltage 2) correct polarity 3) correct type (AC or DC) or 4) can supply the amount of power needed to operate the device.

You may have done irreversible damage to your device by literally "grabbing any old charger that fits" to power it. Obtain the correct charger - or if unable to find one; determine the characteristics needed by the device - those variables are listed in 1 through 4 above.

You may find adjustable power sources that allow 1) changing of tips to fit the device, 2) a selector to choose from a range of voltages, 3) a switch to select AC or DC output and 4) the ability to plug in the tip backwards so that the polarity reverses. The last thing needed, is to know how much current in amps or power in watts is needed by the device. The charger / adapter should be chosen on its ability to supply this power continuously - never choose a charger / adapter that provides less than any of the electrical requirements; otherwise damage to the charger or device may occur - and if left unattended, could overheat and cause a fire.

I hope this helps and good luck! Please rate my reply. Thank you.

Hello,

Your monitor needs a 12volt 5amp power supply with + 5,5mm tip. Most universal power supplies will not supply enough amps to power an LCD monitor. If you need an adapter we do have them in stock at:
http://www.ccl-la.com/parts_lcd.htm

I hope this helps, if so please rate this solution.

Buddy
Corporate Computer
www.ccl-la.com

at most electrical stores you can buy a universal power adaptors with a selection of socents to fit most connections. and which has a selector on it for various voltages settings.
take one of the little connectors and see which one fits. then checking the polarity on your device set the polarity the same when plugging the connector into the power supply cable. adjust voltage as needed.

Warning: when connecting a variable power adaptor alway connect on the lowest voltage setting and work up as too high voltage can distroy your appliance.

Just make sure that the VOLTAGE and MILIAMP input rating match what it says on the Sonic unit itself, and that the connector is the correct size. More importantly, make sure that the polarity of the plug is correct. Some are inner connector = positive and outer connector = negative or vice-versa. That also should be on a sticker on the Sonic unit or embossed into the case near the connector. DC voltage is UNFORGIVING when the polarity is reversed. The unit itself doesn't care WHAT is supplying the current to run it AS LONG AS ALL THE ABOVE FACTORS ARE MET. If this has been helpful, please rate it accordingly. Thanks and good luck. FYI: check eBay for universal power supplies that include different tips. One should fit your unit. $15-$30

It usually wont hurt if the polarity is not right. Most electronic device have a diode to protect it from reverse polarity. Make sure that it needs 12V. If you put higher voltage than what it needs that is what will damage it.

It's OK to use a power supply with a bigger current capacity than needed. If you find once with, say, 24V and 1.0A then that's usable - the wheel will draw as much as it needs.
Therefore:
Same voltage (24V)
Same or greater current (=>0.75A)
Same polarity (positive centre) __________________
Same as the Momo Racing Black, positive inside, negative outside.

The G25 power supply output is stronger: 24Vdc, 1.75A, same polarity.

As long as output voltage, polarity, amperes and connectors are the same you should be fine using a compatible unit, if you find one. In your case it would be 24V, 0.75A, positive inside, but if I were in you I'd wait for some American Driving Force owner to confirm this to be completely sure. The American psu model should however be GAD-SLU-240A8, 110V input, same PSU as Driving Force Pro. Take a look at this for more info. I received this from a forum with people that had the same issues as you and I hope this helps. It seems like they're saying that a store bought universal power supply may mess up your wheel so be careful. If this helps, please leave feed back. FIXYA!

Both the voltage and the polarity should be printed on the case of the router. The polarity should be right next to where the power plugs in.

The polarity information will look something like this:
--(-(+))--

If you take the router into a local Radio Shack, the clerk will probably be able to tell you which power supply you need.

Normally, the polarity is molded next to the connecter hole; it may not be real easy to see.
If you have a digital multimeter with a 'diode' position, most devices have a diode internally installed to prevent damage in case of a bad substitution and the meter will show a value of somewhere between 500-800, typical would be in the mid-600s.
If you find that, then the meter is currently causing the internal protective diode to conduct as it would if the WRONG polarity would be applied and most meters will supply a positive voltage to the red lead for diode function.
Commonly, the center is the positive contact but this sure isn't certain.

the adapter is a thomson output is 19v-200ma--neg polarity