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- ghostgunna
December 14, 2006, 11:09 pm

Hi guys.
I have a music keyboard that didn't come with a power supply. You must
supply your own. The keyboard requires 200mA of 9V DC power.
I have a power supply that allows you to change the voltage & polarity
but it is listed as 1000mA.
Can I use this power supply with the keyboard? What would happen if I
did?
Thanx 4 looking.

Re: Power Supply Intercompatibility

**Probably.
What would happen if I

**It would probably work just fine, as long as you get the polarity right.
However, you should ensure that the new power supply is a 'regulated' type.
An unregulated supply is likely to potentially cause damage.
--
Trevor Wilson
www.rageaudio.com.au
Trevor Wilson
www.rageaudio.com.au
--

Re: Power Supply Intercompatibility

**Then it will be unregulated (with 99% probability), as regulated supplies
are almost always marked appropriately. I advise you not to use it, unless
you can check the output Voltage. An unregulated supply can typically
deliver 30% - 50% higher Volts, when operating at reduced load. That may
cause damage to the connected equipment. A regulated supply will remain
within reasonable tolerance (better than 10%) from zero to full load.
--
Trevor Wilson
www.rageaudio.com.au
Trevor Wilson
www.rageaudio.com.au
--

Re: Power Supply Intercompatibility

**It probably will, somewhere. Certainly, the instruction manual will tell
you.
Does the ampage(?) not matter with this device?
**It matters. However, given the range of input Voltages, it is possible
that an unregulated supply will work OK. Personally, I would always use a
regulated supply. The cost difference is minimal.
--
Trevor Wilson
www.rageaudio.com.au
Trevor Wilson
www.rageaudio.com.au
--
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