Got this today.

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Got my Sega Naomi audio amp in today and we have a green light… That’s a good thing right? Now I just need to put a load on it an see how it does.

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I got a temporary amp to test the stock 3″ speakers that came with the Sega Astro City and I was not impressed at all. In fact, it sounded terrible. So I decided to find some inexpensive replacements and turned to Parts-Express for that. Here are a few different models I am looking at.

The amp I got to drive these speakers is a Sega Naomi Amp.
I know the replacements need to be at the least 3″ and 4 Ohm. The stock speakers are 15 Watt RMS speakers.

Tang Band W3-881SI 3″ Speaker

Peerless 830986 3″ Full Range Woofer

 

Copped this from the Neo-Geo forums.

Tutorial

first step, the amp

2, connect the transformer as shown in the pic.

3, connect this white, black, and green cables to the cable that comes out of the transformer.

4, this are the ends of the white, black, and green cables. Those ends need to be connected to your arcade PSU.

Today I needed to test the AMP, so I had to connect the white and the black cables to a regular AC plug to power the amp.

5, connect the Audio Left (white) and right (red) cables to the amp

6, and then to the PCB board

7, then connect the volume pot molex to the amp. (left hand side next to the audio plugs). volume pot not pictured, I forgot.

8, connect the audio left and right molex to the amp. (right hand side white and red molex)

9. there are 4 end cables from the 2 audio molex, 2 from the white molex (left audio) and 2 from the red molex (right audio) they need to be connected to your cab Stereo plug, in my case was the “F” molex in my Egret II. this one
picture of the cables and the molex:

this is a diagram of the Egret II connector (got the pic from some of Kernow post, thanks!)

and the ends of the red and white audio molex are as follow: WHITE (left audio) Grey is L+ and Orange is L-, and RED (right audio) Grey is R+ and Orange is R-

10, next thing you need to do is go to your ARcade pcb setting and set it to stereo, and make sure you put YOUR CAB in stero, (there should be a switch, at least mine has one switch for Mono and Stereo)

I think thats about it. Power on your cab, if the amp is connected to your cab PSU, it should turn on automatically and be ready to work. Hope it helps.

I just wanted to archive this incase is ever removed.

I am so tired of looking for these AMP UP connectors for my Sega Astro City control panel. I finally found a good USA resource for them. Here are the part numbers for the connectors used in the control panel.

Use this site to search for part numbers
http://octopart.com

http://www.onlinecomponents.com
11125 S. Eastern Ave. Ste 120
Henderson, NV 89052 USA

Speaker male: 4 Pin
Part Number: 176273-1 (Order)

Speaker female:
Part Number: 176294-1 (Order)

Player 1 male: 12 Pin
Part Number: 176278-1 (Order)

Player 1 female: 
Part Number: 176299-1 (Order)

Optional / Kick Harness male: 10 Pin
Part Number: 176277-1 (Order)

Optional / Kick Harness female: 
Part Number: 176298-1 (Order)

Ground male: 2 Pin
Part Number:  176271-1 (Order)

Ground female:
Part Number: 176292-1 (Order)

Male Pins:
Part Number: 175152-1 (Order) (Digikey)

Female Pins:
Part Number: 175150-1 (Order) (Digikey)

 

I finally got my PC to JAMMA converter tested. Next I will get it mounted on a proper piece of wood an clean up the wires. Here is a shot of it.

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Here is the parts list:

  • JAMMA Fingerboard (link)
  • MC Cthulhu from Godlike Controls (link)
  • UltraCade uVC Universal Video Converter (link)

Everything connects to a Dell Quad Core PC.

Here is a shot of everything running in 15khz on my Sega Astro City.

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I got my Godlike Controls ScanLine Generator Kit in the mail today. I jumped on it and got I built in under 25 minutes and it looks great. I hope to get some side by side shots of the LCD without it an with it to compare.

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Got my coin acceptor today for the Sega Astro City. Right now it’s setup for quarters but I will be setting it back up for 100 yen coins.

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It’s kind of a mess right now but I am slowly cleaning it up.