It is currently Sat Jul 21, 2018 12:53 pm

All times are UTC - 7 hours





Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: NES power adaptor spec?
PostPosted: Mon Jul 09, 2018 7:23 am 
Offline
Formerly Fx3
User avatar

Joined: Fri Nov 12, 2004 4:59 pm
Posts: 3127
Location: Brazil
I need another power adaptor, but I need to know the voltage and ampères.


Top
 Profile  
 
PostPosted: Mon Jul 09, 2018 10:05 am 
Offline

Joined: Sun Sep 19, 2004 11:12 pm
Posts: 20280
Location: NE Indiana, USA (NTSC)
The NES Control Deck needs 9 to 10 V, at least 850 mA. Polarity is not important because it uses a diode bridge rectifier. Center negative, center positive, and 9 V AC will all work. Thus the AC adapter for Famicom, Master System, Mega Drive/Genesis model 1, or Sega CD (all 9-10 V DC center negative) will safely power an NES. For example, a Sega MK-1602 (for Genesis) will provide 9 or 10 V DC depending on revision, center negative, at up to 1200 mA. A Sega 3025 (for Master System) provides 9 V DC, center negative, at up to 1000 mA. (See specs and photos at Sega Retro.) It's OK to use an adapter that provides more current (mA) than you need; that's called "headroom".

But don't try using the official NES-002 adapter on a Famicom or Sega system. It'll fry it because these systems can handle only center negative, not the AC that the NES-002 produces.


Top
 Profile  
 
PostPosted: Mon Jul 09, 2018 10:07 am 
Online

Joined: Sun Apr 13, 2008 11:12 am
Posts: 7321
Location: Seattle
Official NES-001 power source is a 9VAC 1.3A supply. (AC, therefore nonpolarized)

It doesn't use the AC anywhere, it just converts it to unregulated DC, goes through the power switch, and then goes two places:
1- presents it on the expansion port for the never-released FDS.
2- goes through a standard 7805 to produce 5V for everything else.

This only counts if you're using an actual NES-001.

The actual NES seems to consume approximately 400-600mA at 5V. I have been using mine with a switching 9VDC 0.5A supply. Anything above 8.2VDC should be fine.


Top
 Profile  
 
PostPosted: Thu Jul 12, 2018 3:58 pm 
Offline

Joined: Tue May 28, 2013 5:49 am
Posts: 982
Location: Sweden
So the NES expansion port gets 9V.

I use a Sega model 1 adapter with my Famicom. It's 1 A so it's probably enough even with a flashcart and lots of accessories.

Here's a sticky that should cover most models of the Famicom and NES:
https://www.famicomworld.com/forum/inde ... pic=6933.0


Top
 Profile  
 
PostPosted: Thu Jul 12, 2018 4:05 pm 
Online

Joined: Sun Apr 13, 2008 11:12 am
Posts: 7321
Location: Seattle
Pokun wrote:
So the NES expansion port gets 9V.
Ehhh....
It's an unregulated power supply. It gets something somewhere between 20VDC and 9VDC depending on load.

The 9VAC 1.3A means that when 1.3A are being drawn the voltage will be 9VAC, but when less current is drawn the voltage will be higher. In addition converting from AC to DC using a full-wave rectifier increases the received voltage by √2. (9VRMSAC ≈ 13VppAC)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group