I designed these circuit boards for various modding purposes, some are assembled, some kits, some are just the pcb. All include instructions. All circuits require regulated 5v except the colecovision video amp.

1. Stereo amplifier 2W x 2
great for PS3 or XBOX laptop project; nice sound
headphone jack support
digital pushbutton volume controls
Uses 4 or 8 ohm speakers
built-in circuit for slowly pulsing "Apple" LED
assembled with pinout
2 available - $39 ea

2. RGB helper
RGB amplifier and Sync separator
Useful for NES, Turbografx 16, N64, etc.
Assembled or bare pcb
2 available - $29 assembled or $9 pcb

3. Atari 5200 v1.2 s-video mod pcb
For info see this thread: http://www.atariage.com/forums/topic/19 ... video-mod/
Bare pcb w/ assembly and installation instructions including Digikey parts list.
Lots available - $6 ea

4. Atari 5200 v2.0 s-video mod pcb
For info see above thread
Bare pcb w/ assembly and installation instructions including Digikey parts list.
10 available - $10 ea

Broken links

what is this "RGB helper" you speak of?

Links fixed.

The RGB helper is a RGB amplifier and sync separator. It can be used to RGB mod the NES, Turbografx, or Nintendo 64.

I am open to offers. Thanks!