https://github.com/iolo/fc-av-mod

Yet another Famicom AV mod with Power LED and USB Power.
https://github.com/iolo/fc-av-mod

Last synced: 4 months ago
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Yet another Famicom AV mod with Power LED and USB Power.

• Host: GitHub
• URL: https://github.com/iolo/fc-av-mod
• Owner: iolo
• Created: 2025-05-13T00:37:56.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2025-06-03T02:34:36.000Z (about 1 year ago)
• Last Synced: 2025-10-27T18:11:24.322Z (8 months ago)
• Homepage: https://iolo.kr/fc-av-mod/
• Size: 37.5 MB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
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

2. Desolder Power Switch

3. Solder 2 x 4.7uF capacitors to reduce jailbar effect(I don't know how it works)

4. 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

![Tear-off RF & PSU board](tearoff_rf_board.jpg)

![Test Video Output](test_video_output.jpg)

![Test Daughter Board](test_daughter_board.jpg)

![Connect Daughter Board - Top](daughter_board_top.jpg)

![Connect Daughter Board - Rear](daughter_board_rear.jpg)

### References

- [Nintendo FAMICOM Mod (USB Power, Composite Video, Stereo Sound)](FamicomMod.pdf) (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/

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May the **SOURCE** be with you...