What type of Power Supply Unit / AC Adapter should (or can) I use with my Famicom?

What type of Power Supply Unit / AC Adapter should (or can) I use with my Famicom?

A2:The specific and original AC Adapter for the Famicom and the Super Famicom has the following specifications:
Input: 100VAC 50-60Hz
Output: 10VDC 850mA
Polarity: Centre Pin Negative
(+)------------(o------------(-)
Barrel Size: Outer Diameter 5.5mm; Inner Diameter 2.1mm

The Sharp Twin Famicom AC-Adapter is different. Its specifications are:
Input: 100VAC 50-60Hz
Output: 7.6VDC 1250mA (1.25A)
Polarity: Centre Pin Positive
(-)------------(o------------(+)
Barrel Size: Outer Diameter 5.5mm; Inner Diameter 2.5mm

The Famicom Disk System AC-Adapter has the following specifications:
Input: 100VAC 50-60Hz
Output: 9VDC 400mA
Polarity: Centre Pin Negative
(+)------------(o------------(-)
Barrel Size: Outer Diameter 5.5mm; Inner Diameter 2.0mm*
*Most 9VDC universal AC-Adapters will work in its place, as it can accept the same tip as the Famicom and the MegaDrive, etc. The factory tip is slightly different (and red!) to prevent accidentally using it on the Famicom.

If you live outside Japan, what all you need to remember is the Output Voltage and Polarity, as you can use any AC-Adapter with the same output ratings (or very similar) and the same type of tip and polarity.

The Famicom has some leeway in the voltage that it can safely accept. We call this the tolerance.

You can use a power supply that varies as follows:
Voltage Output: Minimum 9VDC Maximum 11VDC
Ampere Output: Minimum 700mA, Maximum: -Unlimited-
Polarity: Centre-Pin Negative (+)------------(o------------(-)

Ampere Notes: The FC will draw upon demand, so you can pretty much go as high as you need. You need to worry about covering the minimum rating here, and I suggest an 800mA minimum if you plan to use games with lots of extra memory or if you plan to use external controllers, etc. I would not try to use the 3D glasses, for example, without the full 850mA. Using less won't damage your hardware, but it may damage your PSU.  Others may suggest more or less, but much more will cause the system to overheat, as will be explained below.