fc-av-mod

This is yet another Famicom AV mod with following features:

• Composite Video and Audio output
• USB-C Power Supply
• Power LED

Pre-requisites

• 1 x C1318 Transistor
• 2 x 22K resistors
• 1 x 0.47uF electrolytic capacitor
• 2 x 4.7uF capacitors(optional)
• USB-C connector(female)
• 3.5mm 3 or 4 pole connector(female)
• 1 x LED
• 1 x 330R resistor
• small PCB

Modify Famicom main board

1. Desolder & Tear-off RF & PSU board
2. Extract 4 pin jumper connector
   • VCC
   • GND
   • Video
   • Audio
3. Desolder Power Switch
4. Solder 2 x 4.7uF capacitors to reduce jailbar effect(I don’t know how it works)
5. Solder Power LED with 330R register

Build daughter board

1. 4 pin jumper connector(male; connect with Step. 2)
   1. VCC - Power Switch
   2. GND - GND
   3. Video - 0.47uF capacitor - Collector of C1318
   4. Audio - Audio Output(TODO: Stereo?)
2. USB-C connector
   1. VCC - Power Switch(center)
   2. GND
3. C1318 Transistor
   1. Base - VCC
   2. Collector - 0.47uF capacitor <- FC Video
   3. Base - 22K resistor - Collector
   4. Emitter - Video Output
   5. Emitter - 22K resistor - GND
4. 3.5mm 3 or 4 pole connector
   • NOTE: we have no stereo!
   • NOTE: 3.5mm 4 pole connector is varying by manufacturer
   • 3 pole connector
     1. Audio Left - Audio Output(from 1.3)
     2. Audio Right - Video Output(from 3.4)
     3. GND
   • 4 pole connector
     1. Audio Left - Audio Output(from 1.3)
     2. Audio Right - Audio Output(from 1.3)
     3. GND
     4. Video - Video Output(from 3.4)

Some photos

References

• Nintendo FAMICOM Mod (USB Power, Composite Video, Stereo Sound) (web link is dead)
• https://miko.mobi/famav.htm
• https://8bitplus.co.uk/your-consoles/famicom-av-mod/
• https://8bitplus.co.uk/projects/famicom-av-mod-nintendo/

---

May the SOURCE be with you…