US Helder's modding parts & systems sales

I have a bunch of mods and even some systems that I'll be updating here as I have them for sale, scroll down for the links to buy or PM me:

PAYPAL Fees have been added to the purchase page and will show up in the form of TAX, if you don't want to pay this fee then contact me to send payment as a "Gift" or "Sending Money to Friends".

Mega AMP 1.2



SNES and PSX/PS2 Multi AV Connectors for DIY Cables






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Mega AMP v1.2

Up for sale is the Mega AMP designed by ACE and villahed94 (from sega-16.com) and PCB made by myself. For more info on this mod go to the thread to read up on it, this board has some switches to choose Filtered or Unfiltered sound so the end user can change it but I will set it up with what the customer wants before shipping it out.

If you are using this to replace the CCAM you MUST repair the PSG cut trace or games like Sonic will have missing audio in the tracks and jumps.

$25 for the board and $5 Shipping In USA. Please tell me the motherboard version and model you have when ordering .




$25 for the board and $8 Shipping for International. Please tell me the motherboard version and model you have when ordering .

Here are the install diagrams for the board in just about all motherboard revisions including Genesis Clones.
http://www.mediafire.com/download/hd2q445d256jmo1/Genesis_Mega_AmpInstall_Pics.rar



The Board:


Installation:



Some audio comparisons with stock audio and using the MegaAMP on the 2 different sound Chips in the Genesis models. Thanks to Villahed94 and AlmostOriginal for making these:

Stock:
http://www.mediafire.com/listen/b62...is_II_(VA0)_-_Original_Hardware_-_(Stock).mp3

ASIC YM3438 (Unfiltered):
http://www.mediafire.com/listen/w0wxnb52qgfojlg/Mega_Amp_-_Sonic_3_-__ASIC_YM3438_(Unfiltered).mp3

YM2612 (Unfiltered):
http://www.mediafire.com/listen/2p91xywfelbpcpp/Mega_Amp_-_Sonic_3_-_YM2612_(Unfiltered).mp3

Audio Comparison of Mega Drive 1 VS Mega Drive 2 With Mega AMP






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SNES & PS2 AV Cable Connectors

I have some SNES/N64/NGC and PS1/PS2 AV connectors for making your own cables, these have all pins available (useful for the SNES connectors) so they can be used to build cables with every connection the system offers. I have plenty of the SNES and a limited amount of the PS2 and will only offer 1 or 10 at a time in this thread. If you want larger quantities send me a PM and we can discuss a deal, I also doubt many people will want more than 10 which is why the sale is setup this way.


SNES Style AV Connector:

In USA:
1 Piece $4 plus $3 Shipping


10 pieces $30 plus $3 Shipping




Outside USA
1 Piece $4 plus $7 Shipping


10 pieces $30 plus $7 Shipping



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PS2 Style AV Connector:
In USA:
1 Piece $4.50 plus $3 Shipping


10 pieces $34 plus $3 Shipping




Outside USA
1 Piece $4.50 plus $7 Shipping


10 pieces $34 plus $7 Shipping

 

Got the Mega AMP Mini for sale which is a trimmed down version without the switches to select filtering and doesn't support the addon systems 32X and Sega CD. Basically you choose either filtered or unfiltered sound and the proper version for your motherboard.

This is great for people on a budget and or don't have or care about the addon systems, the install is virtually the same except you don't remove the 32X and Sega CD caps so the install diagrams in the first post can be used here as well.



Mega AMP Mini Board Front:

Mega AMP Mini Board Back:



Comparison of the Standard Board to the Mini Board in size:




Follow the links below to buy for your appropriate motherboard, be sure to tell me if you want to have Filtered or Unfiltered sound or otherwise I will just send it as Unfiltered.

Mega AMP Mini (ASIC) for MD1 VA7, MD2 VA0,VA1,VA1.8,VA3

USA $18 & $5 Shipping


International $18 & $7 Shipping




Mega AMP Mini (YM2616) for MD2 VA2,VA2.3

USA $18 & $5 Shipping


International $18 & $7 Shipping




Mega AMP Mini for (GOAC) MD2 VA4, MD3 VA1,VA2

USA $18 & $5 Shipping


International $18 & $7 Shipping

 

What op amps you have available? The TI is nice but...

 

I only have that one quad, what other one did you have in mind?

 

Do you realize that only 2 op amps are necessary to mix 2 channels? The output buffer stage is redundant, even if buyers decided to add the headphone driver.

Also hi-fi people never use ceramic caps in the signal path because of their non-linearity, and that's the whole point isn't it?

 

There is no headphone driver in this design as it was optional and I see no one really using it and would require more parts and increase board size. The ceramics I can easily replace for tantalum if the sound difference is noticeable.

 

I can see about the caps, but the megadrive has terrible sound anyway, it's no symphony for certain.

I am just tired of the muffled sound, that's all I care about.

 

I have the components in and will be taking orders for these again.

 

I noticed there's a 1.1 on the PCBs, but ACE posted schematics for 1.0
Are there any changes? Or is the 1.1 related to the pcb and has nothing to do with the schematics?
Thanks Helder, good work!

 

There is a 1.0 prototype board which has ceramic and tantalum for all the signals as well as every combination of resistors so that prototype could be used in any genesis and was mainly used to do some testing on various systems to see what worked and didn't and that was 1.0. Once I figured what worked I designed a smaller 1.1 version so the numbering is just to reflect the pcb revision and not the actual schematic.

 

Very nice, do you think you'll tackle the "System C-2 Mega Amp" variant once that's done?

 

I'm sure the schematic is universal it's just the resistor values change which the board I designed is designed for that so once the installation guide and resistor values are known it will adaptable to that.

 

So basically buy this, solder it in using the instructions, buy a Wii AV cable and it's good to go?

Keen!

 

If you have the NESRGB then yes otherwise no reason to do so, I never did make a WII AV Mod board just an SNES one.

4 Full mount and 3 Screw sockets left.

 

4 Full mount and 1 Screw sockets left.

 

Mine is a bone stock console, but I wanted to modify it so I wouldn't have to use an RF module. So if we install this, just using an SNES AV cable will work?

Finally, which one should we buy off of you then for the console? Whichever it is I will grab it today and send payment as soon as you can tell me which one I should get.

 

If you are only interested in composite video, you should just get the SNES type with integrated AV amp PCB from Helder. The Wii socket versions are meant for folks who want to use the more readily available Wii SCART cable for NESRGB board installation.

Helder has another thread for SNES style socket: http://www.assemblergames.com/forum...-S-Nes-Top-Loader-SNES-Style-Multi-A-V-Socket

 

Bump, and the ceramic caps vs tantalum have no discernible difference to the human ear I have an audio clip of the 2 side by side if anyone wants to test it themselves

 

i can't hear the differents in the sounds on a model one or model 2
but model 2 does have a buzzing sound.
other than that.
but i may try one of these to see what's its like

 

One clip of each type: FM+PSG (Sonic 1 Genesis), PSG only (Thunder Blade SMS), CD audio(Sonic CD), and 32X audio with FM. Left channel is all ceramic and Right channel is all electrolytic/tantalum. Use Audacity (free) to play the file and you can also listen to each channel individually.

http://www.mediafire.com/download/jo7cubjxc2e8ar4/MegaAmpCeramicvsElectro.flac