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 Post subject: Re: NESRGB board available now
PostPosted: Tue Jul 14, 2015 7:32 pm 



Joined: 24 Oct 2013
Posts: 45
viletim wrote:
To clarify, are you referring to C2? in the AV Famicom diagram? Its job it to silence the input to the cartridge mixer circuit. I haven't actually built it myself. If you say it doesn't work I'll try it myself and work out why.


C2 in the AV Famicom diagram, yes. It appears to be pulling down expansion audio, atleast with Akumajou Densetsu and Just Breed.
If you would like, I can reinstall it and test with Lagrange Point and the FDS to see if this is a consistent occurrence, although I don't have a Namco 163 cart.


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 Post subject: Re: NESRGB board available now
PostPosted: Tue Jul 14, 2015 8:38 pm 


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viletim wrote:
zakruowrath wrote:
I have a question about the NESRGB does anyone else get a speaker pop when they turn on their system? I just bought a pre-modified AV Famicom system from eBay and every time I turn it on, I hear a pop from my speakers. The first time is always the loudest and if I turn it off, switch a game and turn it back on the pop is much weaker. The system is using the original audio circuit so it doesn't go through the NESRGB mixing circuit, and sadly it does use composite sync instead of CSYNC, but the picture is still pixel perfect. Just thought I would ask if this was normal.


It's normal operation for all game consoles of the era. The pop sound is the audio circuit biasing itself. Given the space and the budget it can be removed. For example, original Famicom version of the NESRGB kit has separate board which is mostly dedicated to audio. It eliminates the turn on pop and reduces the size of the turn off pop.


I actually may have someone wire up the board so that it uses the NESRGB audio circuit rather than the original, and possibly the expansion audio. I don't believe I have any games that use the expansion audio but might as well if I'm going through the trouble of having it wired up for CSYNC and NESRGB audio mixing. If the NESRGB circuit dampens the pop then well worth it. :D

So the pop is DC bias being applied to the circuit, you learn something new everyday :)

Question, would you wire the single audio output wire of the NESRGB to both L and R (Pins 11 and 12) on the multi-out for dual mono correct?


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 Post subject: Re: NESRGB board available now
PostPosted: Fri Jul 17, 2015 3:35 am 


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Location: DFW area, Texas
I decided to brave opening up my RGB modded NES and restore the expansion audio channel. This requires adding a resistor between pin 9 and 3 of the expansion connector on the NES motherboard. Many references claim the resistor needs to be 47k, but retrofixes.com claimed better results with a 24k resistor. So I went with 24k and it worked beautifully! I loaded up the Japanese version of Castlevania 3 on my EverDrive and it sounds perfect!

Here's a pic of my complete mod:

Image

The wire leads are wrapped completely around the pins, and then soldered into place after I clipped the excess wire coming off the pins.
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 Post subject: Re: NESRGB board available now
PostPosted: Sat Jul 18, 2015 7:09 am 


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Location: DFW area, Texas
To follow up on the flash-cart expansion audio mod:

I've rigged a 2nd NES deck to where I can test multiple different resistor levels and record the results into my computer using stage 1 one of Castlevania 3. I've just finished a direct recording of 24k and 47k, and I now have to disagree with retrofixes.com about 24k being better sound. To me it sounds much too loud whereas 47k sounds closer to accurate. However, my 'control' recording still suggests 47k is too loud, so I'm going to try higher resistor levels until maybe I can dial in the perfect ratio. I've got 56k and 68k on hand, so I'm going to test those next.

I'll report back what sounds the best of the lot.

Update:

I went all the way up to 68k and found the sweet spot was 56k. That sounds the most accurately balanced on the volume level. Here are the results of all the tests I did:

24k: Way too loud
47k: A tad too loud
56k: Sounds just right
68k: A tad too soft
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SNES Serial DB: https://docs.google.com/spreadsheets/d/1HYLy_TTDop_FzuX6qnxuQI43upg4raXfno582taO744/pubhtml


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 Post subject: Re: NESRGB board available now
PostPosted: Mon Jul 20, 2015 8:08 am 



Joined: 02 Mar 2015
Posts: 27
Well, just wire a 24k resistor in series with a 50k log pot and you'll be able to dial in your setting (in the 24-74k range) on the fly.


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 Post subject: Re: NESRGB board available now
PostPosted: Mon Jul 20, 2015 9:33 am 


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Could just throw a 100K pot in series as a rheostat and get ~0-100K :P.


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 Post subject: Re: NESRGB board available now
PostPosted: Mon Jul 20, 2015 10:12 am 



Joined: 02 Mar 2015
Posts: 27
Right, but I'm just afraid 0 could harm the NESRGB audio circuit since it was designed to have a resistor there from the start.


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 Post subject: Re: NESRGB board available now
PostPosted: Mon Jul 20, 2015 11:52 am 


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Location: DFW area, Texas
Not a big deal. I just replaced the 24k with a 56k and it sounds kosher on Akumajou Densetsu through the EverDrive N8. However, I will state that the EverDrive is actually emulating these extra sound channels, and its emulation of the FDS sound channel is completely off and sounds like crap.
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 Post subject: Re: NESRGB board available now
PostPosted: Thu Jul 30, 2015 4:29 pm 


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Location: Asheville, NC
@ FBX

Glad my old article could help you. Further down the page it discussed using 24-60k range of resistors.
Using Carts vs Flashdrives can vary in volume.


You stated that you found the 56Kohm perfect. Did you know that the Everdrive has 2 expansion audio Levels in the software? Hi and LO.
Which setting were you using with the 56k resistor?


Thanks!


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 Post subject: Re: NESRGB board available now
PostPosted: Thu Jul 30, 2015 6:57 pm 


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Location: DFW area, Texas
RetroFixes wrote:
@ FBX


You stated that you found the 56Kohm perfect. Did you know that the Everdrive has 2 expansion audio Levels in the software? Hi and LO.
Which setting were you using with the 56k resistor?


Thanks!


It was default to the "Hi" setting. When I tried it just now on "Lo", I couldn't here any of the expansion audio for Castlevania 3.
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 Post subject: Re: NESRGB board available now
PostPosted: Sun Aug 16, 2015 5:20 am 


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Hi guys im new here, i have a video issue with my NESRGB installes on a Twin Famicom, apparently only occurs with the green color , any help is appreciated, thansk in advance =)

some pics of the video, connected through XRGB mini.

Image
Image
Image

pics of the installed NESRGB.

Image
Image
Image
Image


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 Post subject: Re: NESRGB board available now
PostPosted: Mon Aug 17, 2015 12:43 am 


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Posts: 2100
Location: DFW area, Texas
Try increasing the black level and lowering the brightness level in the Framemeister just to see if it removes the background noise.
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NES NTSC Palettes: http://www.firebrandx.com/nespalette.html

SNES Serial DB: https://docs.google.com/spreadsheets/d/1HYLy_TTDop_FzuX6qnxuQI43upg4raXfno582taO744/pubhtml


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 Post subject: Re: NESRGB board available now
PostPosted: Mon Aug 17, 2015 12:54 am 


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Posts: 135
Location: Stockholm, Sweden
Maybe the output capacitor is busted on the green channel? Tantalum caps can be a bit sensitive.


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 Post subject: Re: NESRGB board available now
PostPosted: Sat Aug 22, 2015 4:48 am 


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yxkalle wrote:
Maybe the output capacitor is busted on the green channel? Tantalum caps can be a bit sensitive.


in deed it was the capacitor on the green channel, thank you very much yxkalle and FBX for your help.

capacitor removed
Image

here is the new one, nothing fancy
Image

Clean Green :D
Image

sorry for the delay and the cell phone photos.


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 Post subject: Re: NESRGB board available now
PostPosted: Sat Aug 22, 2015 12:52 pm 



Joined: 22 Aug 2015
Posts: 6
Hello all! I just registered on the forum and this will be my first post!

I just got an old famicom (HVC-CPU-GPM-02) and am about to mod this to my liking. I am currently stuck at the options I got regarding the audio. I plan to order the NESRGB with the power/audio board to go with it.

I'm about to add regular controller ports to the console with support for zapper and mic by a toggle switch.

I've also learned that my revision of motherboard has a bad value on a resistor before sending the audio to the cart.
If looking at the circuit on the famicom board I would change resistor R7 on this schematic http://nesdev.com/Ntd_8bit.jpg
Mind, on GPM-02 this value is 43K (checked!)
43K would make sound come out too low before mixing with cart/everdrive.

If I was to use the NESRGB audio circuit and get sound directly from CPU, where do I connect the cable from the mic (with R3 in line) and where to swap resistor(s) for a trimpot? The only thing I found in this thread was the fix for the AV famicom but that fix does not make use of the power/audio board shipped with the old famicoms, right?
A schematic for the power/audio board for the NESRGB would be very helpful!

So, how to do to keep mic and be able to adjust sound level before the mixing with expanded sound from cart?


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 Post subject: Re: NESRGB board available now
PostPosted: Sat Aug 22, 2015 1:11 pm 



Joined: 13 Mar 2011
Posts: 1025
Location: Toronto, Canada
I believe that SNES SCART cables have caps in them already. So it's safe to remove that cap and just jumper the 2 pads.


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 Post subject: Re: NESRGB board available now
PostPosted: Sat Aug 22, 2015 4:32 pm 


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Posts: 135
Location: Stockholm, Sweden
leonk wrote:
I believe that SNES SCART cables have caps in them already. So it's safe to remove that cap and just jumper the 2 pads.


I don't think he's using a SNES/GC cable. :)

@reimon00 glad to be able to help you!


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 Post subject: Re: NESRGB board available now
PostPosted: Sat Aug 22, 2015 8:58 pm 



Joined: 22 Aug 2015
Posts: 6
Notised that the NESRGB currently is out of stock. The shop also mentioned an upcoming retailer in Germany. Anyone know when this shop might be up and running?

Also, if mic turns out to be hard to implement into nesrgb audio board, I propably will settle for it just working but not come through to the CRT.. It would be cool still to be able to mix audio levels by a knob.


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 Post subject: Re: NESRGB board available now
PostPosted: Mon Aug 24, 2015 12:18 pm 



Joined: 07 Feb 2013
Posts: 221
Anyone have a working NESRGB board spare which a friend to me can purchase?


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 Post subject: Re: NESRGB board available now
PostPosted: Wed Sep 02, 2015 9:58 am 


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happy me!

Image
Image
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 Post subject: Re: NESRGB board available now
PostPosted: Fri Sep 04, 2015 5:52 pm 



Joined: 04 Sep 2015
Posts: 2
Hi all,

I'm brand new to the Shmup forums, so I don't want to sound like a jerk or anything, but I was hoping someone here could help me out. I have an NES toploader that I would like to have modded with the NESRGB. I'm located in the US and was hoping to be able to send off my console to someone also located in the US. I would prefer to buy a packaged deal, ie whomever I send it to would have all parts on hand to do the mod.

You can look me up on the sega-16 forums under the same name. I am always on-time with my payments and I don't mind working with you to make this an easy deal.

If I'm out of line or anything like that, please let me know. I don't want to be a nuisance on this forum.

Thanks!


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 Post subject: Re: NESRGB board available now
PostPosted: Sun Sep 06, 2015 2:41 pm 



Joined: 24 Jun 2015
Posts: 173
Location: Florida
Does anyone know when the NESRGB boards will be back in stock? I would like to purchase the board the the replacement toploader AV panel, but I'm having no luck finding an in-stock source.

Thanks.

edit: put myself on the Australian distributors waiting list. Fingers crossed :)


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 Post subject: Re: NESRGB board available now
PostPosted: Sun Sep 06, 2015 3:04 pm 


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Joined: 04 Mar 2008
Posts: 483
The website says mid-September.


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 Post subject: Re: NESRGB board available now
PostPosted: Wed Sep 09, 2015 7:06 pm 



Joined: 19 Jun 2008
Posts: 168
mufunyo wrote:
Can anyone tell me what this means?

Image

Image


A year later, and I have this figured out. The console in question contained a 7806, instead of a 7805. The Nintendo parts are all robust enough to merrily chug along without fault at 6V, but the NESRGB is apparently more sensitive equipment.

tl;dr I soldered in a 7805 and now everything works as it should.


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 Post subject: Re: NESRGB board available now
PostPosted: Fri Sep 11, 2015 3:05 pm 



Joined: 11 Sep 2015
Posts: 11
<deleted>

tl;dr my first PPU desolder didn't go so well. Learned a lot and will try again.


Last edited by intrepidbreak on Sun Sep 13, 2015 1:10 am, edited 1 time in total.

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 Post subject: Re: NESRGB board available now
PostPosted: Fri Sep 11, 2015 6:41 pm 


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Posts: 2100
Location: DFW area, Texas
DCMasterCaster wrote:
Hi all,

I'm brand new to the Shmup forums, so I don't want to sound like a jerk or anything, but I was hoping someone here could help me out. I have an NES toploader that I would like to have modded with the NESRGB. I'm located in the US and was hoping to be able to send off my console to someone also located in the US. I would prefer to buy a packaged deal, ie whomever I send it to would have all parts on hand to do the mod.

You can look me up on the sega-16 forums under the same name. I am always on-time with my payments and I don't mind working with you to make this an easy deal.

If I'm out of line or anything like that, please let me know. I don't want to be a nuisance on this forum.

Thanks!


I was very happy with Yurkie's work on my NES. He's the semi-official modder/distributor for NESRGB in the USA. Strangely though, he operates from Atari Age forums:

http://atariage.com/forums/topic/222002 ... stributor/
_________________
Framemeister profiles: http://www.firebrandx.com/framemeisterprofiles.html

NES NTSC Palettes: http://www.firebrandx.com/nespalette.html

SNES Serial DB: https://docs.google.com/spreadsheets/d/1HYLy_TTDop_FzuX6qnxuQI43upg4raXfno582taO744/pubhtml


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 Post subject: Re: NESRGB board available now
PostPosted: Fri Sep 11, 2015 8:15 pm 



Joined: 04 Sep 2015
Posts: 2
FBX wrote:
DCMasterCaster wrote:
Hi all,

I'm brand new to the Shmup forums, so I don't want to sound like a jerk or anything, but I was hoping someone here could help me out. I have an NES toploader that I would like to have modded with the NESRGB. I'm located in the US and was hoping to be able to send off my console to someone also located in the US. I would prefer to buy a packaged deal, ie whomever I send it to would have all parts on hand to do the mod.

You can look me up on the sega-16 forums under the same name. I am always on-time with my payments and I don't mind working with you to make this an easy deal.

If I'm out of line or anything like that, please let me know. I don't want to be a nuisance on this forum.

Thanks!


I was very happy with Yurkie's work on my NES. He's the semi-official modder/distributor for NESRGB in the USA. Strangely though, he operates from Atari Age forums:

http://atariage.com/forums/topic/222002 ... stributor/


Thanks FBX for your help! I found another modder in the US, Wesley Almond, through the NESRGB page. He was one of the recommended modders on the site, so it should go well.

Thanks for not roasting me about my first post. Much appreciated. I'll be sure to let you guys know how this goes.

Thanks!


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 Post subject: Re: NESRGB board available now
PostPosted: Sat Sep 12, 2015 8:14 am 



Joined: 22 Aug 2015
Posts: 6
Thought I'd make a RGB cable while waiting for the kit to get in-stock again.

On Viletilm's RGB cable circuit board, it doesn't seem to be any capasitors nor resistors?

Just a straight connection from 8-din to scart pins, right?


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 Post subject: Re: NESRGB board available now
PostPosted: Sat Sep 12, 2015 8:31 am 


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Joined: 22 Jun 2011
Posts: 1274
Location: Bedfordshire, England.
FBX wrote:
To follow up on the flash-cart expansion audio mod:

I've rigged a 2nd NES deck to where I can test multiple different resistor levels and record the results into my computer using stage 1 one of Castlevania 3. I've just finished a direct recording of 24k and 47k, and I now have to disagree with retrofixes.com about 24k being better sound. To me it sounds much too loud whereas 47k sounds closer to accurate. However, my 'control' recording still suggests 47k is too loud, so I'm going to try higher resistor levels until maybe I can dial in the perfect ratio. I've got 56k and 68k on hand, so I'm going to test those next.

I'll report back what sounds the best of the lot.

Update:

I went all the way up to 68k and found the sweet spot was 56k. That sounds the most accurately balanced on the volume level. Here are the results of all the tests I did:

24k: Way too loud
47k: A tad too loud
56k: Sounds just right
68k: A tad too soft


I did a test about a yeat ago now, with 22k resistor...

https://www.youtube.com/watch?v=1GUygyhNw-Y

and 47k...

https://www.youtube.com/watch?v=Jd-s5cmKJOQ

but i now use a pot to adjust the audio level


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 Post subject: Re: NESRGB board available now
PostPosted: Sun Sep 13, 2015 7:21 am 



Joined: 07 Feb 2014
Posts: 110
Image

Did a quick little design for a PCB that would let me attach my USB Blaster to the NESRGB without having to slice up the cable.

The board only provides that the active IDC pins are available, so I plan to simply solder in machine headers instead of having an actual IDCC10, as well as for the JTAG connection. It's also probably the smallest board I've ever designed, having an area of just over 0.55in². Admittedly, probably not really necessary, but I prefer this solution personally as opposed to destructive modification to my, quite permanently attached, USB Blaster cable.
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