The RGB NES jamma adapter

[Drakon]

This's a project I was commissioned to build.

http://www.youtube.com/watch?v=ld2B1y8CgeM

This wasn't as easy as I expected. Apparently arcade rgb is about 4x as strong as scart or home use rgb so I needed to build an amp that would bring the levels up enough.

The rgb from the ppu first passes through a sony cxa2075 circuit for a couple of reasons. The cxa2075 amps the signals up to home standard strength and it also converts the signal into perfect looking s-video. The rgb from the ppu stays crisp when passing through this encoder circuit at close range.

Anyway here's the rgb amp I wound up using to get the rgb up to arcade strength:



What's great about this adapter is it uses normal plugs for the console. The power comes from the 12v line on the jamma connector and connects to the console using the regular power jack at the back. The AV signals connect through a modified scart cable that just plugs into the snes multi av port built into the back of the av famicom. When I build the controllers they'll connect through the regular controller ports.

[APE]

I'm going to go out on a limb and assume you were using a Playchoice 10 PPU for this NES; assuming that is correct what sort of amplification does the PC10 board use for output from the PPU?

[Drakon]

The rgb from the ppu first passes through a sony cxa2075 circuit for a couple of reasons. The cxa2075 amps the signals up to home standard strength and it also converts the signal into perfect looking s-video. The rgb from the ppu stays crisp when passing through this encoder circuit at close range.

reading ftw. Yes it's a playchoice 10 rgb ppu chip.

[APE]

The rgb from the ppu first passes through a sony cxa2075 circuit for a couple of reasons. The cxa2075 amps the signals up to home standard strength and it also converts the signal into perfect looking s-video. The rgb from the ppu stays crisp when passing through this encoder circuit at close range.

reading ftw. Yes it's a playchoice 10 rgb ppu chip.

And what does the PC10 use for amplification?

[Drakon]

The rgb from the ppu first passes through a sony cxa2075 circuit for a couple of reasons. The cxa2075 amps the signals up to home standard strength and it also converts the signal into perfect looking s-video. The rgb from the ppu stays crisp when passing through this encoder circuit at close range.

reading ftw. Yes it's a playchoice 10 rgb ppu chip.

And what does the PC10 use for amplification?

A transistor amp of course, but it inverts the rgb.