Welcome, Guest. Please login or register.
Did you miss your activation email?
September 02, 2014, 05:49:27 PM
Home Famicom World Search Calendar Login Register

+  Famicom World
|-+  Family Computer
| |-+  Famicom / Disk System (Moderators: manuel, MaxXimus, The Uninvited Gremlin, L___E___T)
| | |-+  Famicom AV Mod
0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] 2 Print
Author Topic: Famicom AV Mod  (Read 1880 times)
theelf
Famiclone
*
Gender: Male
Japan Japan
Posts: 23



« on: July 15, 2012, 07:49:12 PM »

HI, i was reading how to mod my famicom to have AV, but my famicom have square buttons, and i don't know if is the same that the round button famicom

I found this topic,

http://www.famicomworld.com/forum/index.php?topic=5520.0

but i don't see diagrams, or what i need to make the AV mod in this different famicom

thanks



Logged
famifan
Twin Famicom
*****
Russian Federation Russian Federation
Posts: 691



WWW
« Reply #1 on: July 15, 2012, 08:09:44 PM »

http://www.famicomworld.com/forum/index.php?topic=4713.0 (a long one thread)

form of plastic buttons can't change anything related to PPU composite video output.

if you in doubt it is better to rebuild the complete buffer plus amplifier circuit connected to video output directly
Logged
80sFREAK
Sharp C1
*****
Gender: Male
Japan Japan
Posts: 2185


« Reply #2 on: July 15, 2012, 11:07:36 PM »

Quote
plastic buttons can't change anything related to PPU composite video output.
Right.

Quote
but i don't see diagrams, or what i need to make the AV mod in this different famicom
Ask "guru", i'm pretty sure, he still around. Or, better, read "long thread".

Quote
Oh lol! I have to apologize to Da Bear - man, you doing very well... very well...

Fuck!,When you will start washing boards after soldering?!


P.S. Canon EOS DIGITAL REBEL XTi made my day
Logged

I do not have paypal, facebook, twitter accounts. Don't ask me why.
UglyJoe
Administrator
FamicomBox
*****
Gender: Male
United States United States
Posts: 4606



WWW
« Reply #3 on: July 16, 2012, 12:15:21 AM »

To the OP:

The thread you linked to is by a member who used to sell his own A/V mod kits.  He has since disappeared from FW after a mysterious fire, so you can pretty much abandon that avenue.

The "long thread" is the one to use for now.  It is summarized in this post: http://www.famicomworld.com/forum/index.php?topic=4713.msg117815#msg117815
Quote
to summarise the steps:
1) shield the PPU crystal by some copper foil
2) use any AV-amplifier circuit you want. At least 3 variants you can find in this thread.
3) if unsatisfied with results (e.g. to much jailbars) - add ceramic capacitors as closer as possible to every ICs' power pins. 0.1uF al least. It is better to use SMD caps with the biggest capacitance you can find (also, can be a little expensive)

The first step pretty simple, just add copper foil tape to the PPU.  I don't know if placing the foil on the top of the PPU is good enough or if you will need to lift the PPU and cover both sides (as seen here).

The second step involves reading through the long thread and picking a video circuit.  As a non-technical guy, I think that the instructions on jpx72's website (as found in that thread) are the most user-friendly.

The third step is covered best in this post, I think.

Even though you (potentially) have an old square-button Famicom unit, I don't think the board varies so wildly that these same techniques wouldn't work.

---

To anyone else more knowledgeable on this subject:  Feel free to correct me anywhere I am factually inaccurate.  I would like to have a good summary of the av-mod thread, and this is my first attempt at doing that.
Logged
80sFREAK
Sharp C1
*****
Gender: Male
Japan Japan
Posts: 2185


« Reply #4 on: July 16, 2012, 01:26:58 AM »

To the OP:

The thread you linked to is by a member who used to sell his own A/V mod kits.  He has since disappeared from FW after a mysterious fire, so you can pretty much abandon that avenue.
Looks like now we have official position. Wink That's good!

Quote
The "long thread" is the one to use for now.  It is summarized in this post: http://www.famicomworld.com/forum/index.php?topic=4713.msg117815#msg117815
Quote
to summarise the steps:
1) shield the PPU crystal by some copper foil
2) use any AV-amplifier circuit you want. At least 3 variants you can find in this thread.
3) if unsatisfied with results (e.g. to much jailbars) - add ceramic capacitors as closer as possible to every ICs' power pins. 0.1uF al least. It is better to use SMD caps with the biggest capacitance you can find (also, can be a little expensive)
check
Quote
The first step pretty simple, just add copper foil tape to the PPU.  I don't know if placing the foil on the top of the PPU is good enough or if you will need to lift the PPU and cover both sides (as seen here).
check
Quote
The second step involves reading through the long thread and picking a video circuit.  As a non-technical guy, I think that the instructions on jpx72's website (as found in that thread) are the most user-friendly.
but not correct. In video circuit you don't need to use 220uF capacitor, 22uF or 33uF is far enough.

 Choose one. I'm after first diagram with 100R and 150R insted of 220R and 2k2, capacitor as above.
 Pin 22 should be grounded via ceramic capacitor 0.1uF or so. Some SMD ceramic capacitors around board needed. All pins MUST BE AS SHORT AS POSSIBLE. Don't need to use long wire for +5V - there is plenty spots on PCB to make it as short as possibe.
Quote
The third step is covered best in this post, I think.
check. However at moment few variations exist, i should upload some photos.
Quote
Even though you (potentially) have an old square-button Famicom unit, I don't think the board varies so wildly that these same techniques wouldn't work.
check. Only the difference, where to get +5V on the PCB.

That's all

P.S. At moment i have one unit under modding(probably last one...) with already desoldered PPU. Just checked capacitance between pin21 and pin22 on PCB. It's about 10pF which is big enough to gather noise.
« Last Edit: July 16, 2012, 05:53:50 AM by 80sFREAK » Logged

I do not have paypal, facebook, twitter accounts. Don't ask me why.
famiac
Twin Famicom
*****
Gender: Male
United States United States
Posts: 662



« Reply #5 on: July 16, 2012, 07:39:31 AM »

This should get stickied. All the good info in one place and if people want to add, they post.
Logged

member #844 and 565
jpx72
Sharp C1
*****
Gender: Male
Slovakia Slovakia
Posts: 1401



WWW
« Reply #6 on: July 16, 2012, 11:31:43 AM »

Finaly 80's! Thanks for uploading those schematics, I can do some drawings on actual PCB photos for easy install even for newbies.
BTW there is missing value on the capacitor at sharp twin schematic
Logged

theelf
Famiclone
*
Gender: Male
Japan Japan
Posts: 23



« Reply #7 on: July 16, 2012, 12:12:36 PM »

Hi, thanks for reply to all

I don't understand much of hardware (I'm more software guy), but my brother yes, i will show this diagrams, for sure he can do the modding

Thanks 80sFREAK for the drawing

Now i need to think in a way of modding the console, without damage the case

In two days, i need to flight overseas, then i will do the mod in one month, i will post back then with results



Quote
Even though you (potentially) have an old square-button Famicom unit, I don't think the board varies so wildly that these same techniques wouldn't work.

No idea, i take a picture of the board



And reading, i found that this boards have a number in corner, mine have 03 in the board




For what i saw, is not different from others, then no problem for sure. Must not be so old

« Last Edit: July 16, 2012, 12:20:34 PM by theelf » Logged
jpx72
Sharp C1
*****
Gender: Male
Slovakia Slovakia
Posts: 1401



WWW
« Reply #8 on: July 16, 2012, 12:19:58 PM »

Do you realize that your famicom is quite rare, Rev. 03 square button famicom? Maybe you shouldn't mod this one, keep it for it's value and buy another, round button one for modding and playing!
http://famicomworld.com/workshop/tech/square-button-famicom/
Logged

theelf
Famiclone
*
Gender: Male
Japan Japan
Posts: 23



« Reply #9 on: July 16, 2012, 12:23:51 PM »

Do you realize that your famicom is quite rare, Rev. 03 square button famicom? Maybe you shouldn't mod this one, keep it for it's value and buy another, round button one for modding and playing!
http://famicomworld.com/workshop/tech/square-button-famicom/

Oh thanks i have no idea is rare, well, a famicom is only 200 yens in japan, for my is the same to buy a new one

Now i use a Famulator to play, have AV and the quality is good, i lime the pads!!

Is just a friend gift to me this famicom, and i wanna give some use, but i don't like RF Smiley jaja

thanks for tip, maybe better just put in collection without touch
Logged
jpx72
Sharp C1
*****
Gender: Male
Slovakia Slovakia
Posts: 1401



WWW
« Reply #10 on: July 16, 2012, 12:24:55 PM »

Man this is one of the rarest famicoms out there! Damn, get me one for that price too! Grin
Logged

theelf
Famiclone
*
Gender: Male
Japan Japan
Posts: 23



« Reply #11 on: July 16, 2012, 12:27:56 PM »

Man this is one of the rarest famicoms out there! Damn, get me one for that price too! Grin

Oh this Famicom is a gift, like i say in the post i edit, but for 200-500 yen u can get a famicom in any store. 99% of time are round button, but i bought one square in past for 300 yen or something like this


Mi friend gift to me, the famicom, a nice Sansui pad (very cool pad), and a weird unplayable game Smiley

« Last Edit: July 16, 2012, 12:35:45 PM by theelf » Logged
famiac
Twin Famicom
*****
Gender: Male
United States United States
Posts: 662



« Reply #12 on: July 16, 2012, 04:40:56 PM »

Family School.

Edit: i misread the katakana.
Logged

member #844 and 565
famiac
Twin Famicom
*****
Gender: Male
United States United States
Posts: 662



« Reply #13 on: July 16, 2012, 10:35:06 PM »

True
Logged

member #844 and 565
Da Bear
Famicom
**
Posts: 99



« Reply #14 on: July 19, 2012, 04:14:16 PM »

Oh lol! I have to apologize to Da Bear - man, you doing very well... very well...

 Shocked

Square or not. This is how I AV mod Famicoms that goes for sale, or Famicom's that I mod for other people. Minimal work on the motherboard, some components removed and replaced on the RF board.
Looks pretty neat. RF capabilities are gone though, as I output composite video on the RF connection. No complains yet and from the outside it looks almost stock.

When I do my own projects I don't really care how it looks.

Logged
Pages: [1] 2 Print 
« previous next »
Jump to:  


Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!