It is currently Thu Oct 19, 2017 6:37 pm

All times are UTC - 7 hours





Post new topic Reply to topic  [ 23 posts ]  Go to page Previous  1, 2
Author Message
PostPosted: Sat Apr 29, 2017 11:59 am 
Offline
User avatar

Joined: Sat Apr 01, 2017 10:23 pm
Posts: 4
infiniteneslives wrote:
Well I've had this thread bookmarked forever, and finally got around to performing the twin famicom video circuit mod to my original famicom.

Hi, friend! I've recently started collecting parts for this specific twin-circuit, can you take a look, please, if it fits?

    1N4148 DO-35 switching signal Doide
    2SC1740 C1740
    A1015 2SA1015 0.15A/50V PNP TO-92 DIP
    Panasonic FM Series Capacitor Low Impedance (25v, 220uf)

I haven't done my homework regarding the resistors yet, can you suggest what kind suits best here?


Top
 Profile  
 
PostPosted: Sat Apr 29, 2017 12:05 pm 
Offline
User avatar

Joined: Mon Apr 04, 2011 11:49 am
Posts: 1905
Location: WhereverIparkIt, USA
ThePunisher wrote:
I haven't done my homework regarding the resistors yet, can you suggest what kind suits best here?


Your selections look fine to me at a glance. There's nothing special about the resistors.. Just get the suggested values in carbon film and you should be fine.

_________________
If you're gonna play the Game Boy, you gotta learn to play it right. -Kenny Rogers


Top
 Profile  
 
PostPosted: Sat Apr 29, 2017 12:19 pm 
Offline
User avatar

Joined: Sat Apr 01, 2017 10:23 pm
Posts: 4
infiniteneslives wrote:
ThePunisher wrote:
I haven't done my homework regarding the resistors yet, can you suggest what kind suits best here?


Your selections look fine to me at a glance. There's nothing special about the resistors.. Just get the suggested values in carbon film and you should be fine.

Thanks alot, friend! I will post a video of gameplay, once all the parts arrive, and I'm done with soldering.


Top
 Profile  
 
PostPosted: Sat Apr 29, 2017 10:19 pm 
Offline
User avatar

Joined: Sat Apr 01, 2017 10:23 pm
Posts: 4
infiniteneslives wrote:
ThePunisher wrote:
I haven't done my homework regarding the resistors yet, can you suggest what kind suits best here?


Your selections look fine to me at a glance. There's nothing special about the resistors.. Just get the suggested values in carbon film and you should be fine.


Btw, the resistor values, described in the screenshot are regular ohm, right? Not kilo- or micro- ?


Top
 Profile  
 
PostPosted: Sat Apr 29, 2017 10:42 pm 
Offline
User avatar

Joined: Mon Apr 04, 2011 11:49 am
Posts: 1905
Location: WhereverIparkIt, USA
Correct.

_________________
If you're gonna play the Game Boy, you gotta learn to play it right. -Kenny Rogers


Top
 Profile  
 
PostPosted: Fri May 05, 2017 8:35 am 
Offline
User avatar

Joined: Sat Apr 01, 2017 10:23 pm
Posts: 4
infiniteneslives wrote:
Correct.

Hi, once more I need to consult with you:
    Where did you take the Ground? 80sFreak was very specific about it "Take ground from pin20 PPU. Don't ask why, just do it."
    Did you lift the leg of PPU or just cut the pcb route? I really want to keep PPU untouched.
    What kind of wire did you use? Shielded? Single vein?


Top
 Profile  
 
PostPosted: Fri May 05, 2017 9:01 am 
Offline
User avatar

Joined: Mon Apr 04, 2011 11:49 am
Posts: 1905
Location: WhereverIparkIt, USA
I wouldn't lift any pins from the PPU if it were my famicom. Maybe it would help remove some of the jail bars if I did though..?

You can see where I took ground in my pictures. I just took it from the most convenient location. You can also see I just used cheapo IDE style ribbon cable.

These choices prob aren't the best ones. They were just what I had and met my desires just fine. Feel free to experiment!

_________________
If you're gonna play the Game Boy, you gotta learn to play it right. -Kenny Rogers


Top
 Profile  
 
PostPosted: Fri May 05, 2017 9:19 am 
Offline

Joined: Sun Sep 19, 2004 11:12 pm
Posts: 19104
Location: NE Indiana, USA (NTSC)
My speculation about the use of pin 20 in particular:

PPU pins 40 and 20 are the PPU's power and ground pins, connected to the bypass capacitor nearest the PPU. I guess taking ground close to the PPU avoids ground loops and unwanted coupling.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 23 posts ]  Go to page Previous  1, 2

All times are UTC - 7 hours


Who is online

Users browsing this forum: Gilbert, lidnariq, Yahoo [Bot] and 9 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