A few Net City power questions

[FrancoB]

Okay, I have my PFX ordered now so I now need to sort what am going to do power wise now for the rest of the cab.

I am going to leave the JVS wiring intact but I want to wire the cab for Jamma too and I have a couple of questions regarding the power.

The cab curretly has a Sega 560-5422 transformer that I would like to remove if possible to give me a little more room.

I spoke to Andy and he said that I can feed the monitor and strip light 240v so thats ok.

Do I need to power the Sun ATX PSU? I'm not planning on having a Naomi set-up but I didn't know if the JVS I/O board under the CP takes power from it or anything else for that matter. I imagine the sound amp next to the ATX takes power from it too, could this be powered from something else if I dont power the ATX? Is there anything else that the ATX powers?

I will also need to power the Jamma harness. I spoke to Adam and he said that some people power Jamma boards from the Sun ATX. If I do power the ATX Is this a good idea to power the Jamma harness from it or should I get a transformer with adjustable 5v etc?

Is there anything I'm missing?

[grantspain]

if you remove the sega stepdown then you will not be able to power the sound amp

[Akuma]

Loosing the transformer is a bad idea because the sound amp runs at 17 Volt or so - funky voltage so good luck finding a PSU solution if you loose the transformer (which steps down the 230 V to 100V and 17V)

The PFX is multivoltage, mine runs at 220V so either voltage is fine

Strip light depends on the ballast. My Naomi Unis from 98 and 99 use Vossloh-Schwabe ballasts which are rated at 100 or 110V. However, there were also ballasts which are rated at 230V and have a big-**** capacitor / resistor - so it depends on the model.

You can get a PC ATX PSU and crimp yourself an adapter for the Naomi. You can also crimp / solder a 4 Pin PC Molex adapter on a Jamma connector to run it through the PC PSU


Your best friend might be the big 2 page wiring diagram that comes woth the owners manual (not the small standard one at the end of Kit manuals)

[FrancoB]

Cheers guys.

It seems a bit daft to keep the **** great transformer just to power the amp. I'll probably remove the amp and get a 240v replacement.

I'm making a cutom I/O panel to house the JVS board and AMP connectors so I'll extend the new amps volume pot to that.

[Akuma]

Ohh - in that case, I could really, REALLY, use that transformer (and a Naomi sound amp) - but due to the weight, shipping would be insane : / You ain't gonna spend holidays in Germany or the Netherlands any time soon and would want to bring it with you?

[FrancoB]

Nothing planned I'm afraid.

Tell ya what, to save on shipping why don't you come over and pick it up?

[Akuma]

Believe me, if I had the possibility to do that, I'd be on my way now!

[FrancoB]

Well I've bought another amp already

Do you want the old one? Obv you need to power it but at least you would be halfway there. I can't imagine it costing that much to ship.

Got one of these for £12 delivered from the states



Sanyo LA4625 115W DIY amp. I have heard good things about them Takes 12-24v DC in, RCA in too - just the job

[Akuma]

Looking good actually - just depends on how it sounds though ; )

If you are getting rid of the Sega amp, I sure could use it but have no funds at the moment

[FrancoB]

I know quite a few peopele who have used them who say they are pretty good.

I can hang on to the Sega amp for the mean time if you like. I could even post it to you and you can pay me whenever if you want.

[Akuma]

I know quite a few peopele who have used them who say they are pretty good.

I can hang on to the Sega amp for the mean time if you like. I could even post it to you and you can pay me whenever if you want.

Thanks but I am in no real rush though as it is for my next project which will be the Christmas-present-cab I'll give to myself Cab is due to arrive early December I guess, so no hurry. Furthermore, of course it depends on how much you are looking for

[FrancoB]

Okies, cool no problems.

Yeah you have to treat yourself, no one else is going to buy you a cab

No idea what they are worh, I'll stick a post in the whats it worth thread unless you know.

I've gotta go to work now (well, 8 hours of Xbox360 ) and can't get onto AO there but I'll get back to you later.

[andygeezer]

I did have a small 17VAC transformer, 240V - 17VAC output.

Seems silly to remove the existing sound amp as it sits nicely on the psu tray and gives you volume controls under the control panel.

[cools]

I did have a small 17VAC transformer, 240V - 17VAC output.

Seems silly to remove the existing sound amp as it sits nicely on the psu tray and gives you volume controls under the control panel.

Airlink will build a transformer to spec

[Flazh]

For the record, the Sun PSU does supply the voltages to the JVS I/O board, as well as that magical 3v for JVS systems, and it is 110v only.

If you want to go down the route of taking out that massive transformer, you can actually use an ATX PSU for all your power needs. The 12v, 5v and 3v connections should nicely give you your power for JVS game boards and JAMMA (though you may have issues with partictularly voltage sensitive boards as an ATX PSU isn't generally very adjustable).

The clever bit is with the sound amp. Instead of using the standard power connections for your power to the sound amp, use the 12v line for your +17v line, and use the -5v line for your 0v/GND line. That will give you an overall voltage of +17v, which should power the amp nicely (basic highschool science stuff this). Assuming that Sega built the amp correctly in the first place and you don't get any voltage leakage down the line level input to the Naomi/other JVS hardware, this setup should work just peachy.

[neokoen]

The clever bit is with the sound amp. Instead of using the standard power connections for your power to the sound amp, use the 12v line for your +17v line, and use the -5v line for your 0v/GND line. That will give you an overall voltage of +17v, which should power the amp nicely (basic highschool science stuff this). Assuming that Sega built the amp correctly in the first place and you don't get any voltage leakage down the line level input to the Naomi/other JVS hardware, this setup should work just peachy.

Does the Naomi sound amp take 17VDC I saw Andygeezer and others refer to 17VAC ?

[FrancoB]

Thanks for the help Flazh. I am installing a ATX PSU anyway for the PC so thats great if I can power the JVS with the 3v line.

It will be interesting to know if the amp does take 17v AC or DC. I just had a look on the transfomer but it didn't say which one it is. t

Seems silly to remove the existing sound amp as it sits nicely on the psu tray and gives you volume controls under the control panel.

I'm planning to make a custom I/O mount under the CP to replace the steel one that the JVS board currently sits on. If I do that I can fit the JVS board and the new amp next to each other so I will still have the volume control (+treble/bass) accessible from under the CP.

I'll probably make it from some black or white 5mm polished acrylic as I'm doing an Ikuraga/Space Invaders theme. You know what my plastic work is like Andy

I'm going to mount the JVS AMP connectors in this panel but also two extra 12 pin and one 10 pin female AMP connectors which will be wired directly to the joys/buttons. I am then going to add male AMP connectors to the DC hacks, 360 hacks and Jamma control wires. I'll make some short male>male mini AMP looms to connect the joys/buttons to the female JVS connectors.

Then if I want to swap systems all I need to do is open the CP and insert the correct male AMP connecters into I/O mount and flick the VGA switch box for 360/DC. I may see if I can extend the switch box knob to the panel too.

I will see what the amp is like when it arrives and take it from there. If I do get rid of the Sun PSU and Naomi amp I will probably use that shelf to mount the pad hacks to.