https://github.com/jbilander/amiga_rgb_video_splitter
Extend your amiga RGB video signal to two display units - screens, monitors, etc, simultaneously
https://github.com/jbilander/amiga_rgb_video_splitter
Last synced: 5 months ago
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Extend your amiga RGB video signal to two display units - screens, monitors, etc, simultaneously
- Host: GitHub
- URL: https://github.com/jbilander/amiga_rgb_video_splitter
- Owner: jbilander
- License: cc-by-sa-4.0
- Created: 2025-05-19T13:05:33.000Z (about 1 year ago)
- Default Branch: main
- Last Pushed: 2025-08-25T15:01:10.000Z (10 months ago)
- Last Synced: 2025-08-25T15:40:44.339Z (10 months ago)
- Size: 5.87 MB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Amiga_RGB_video_splitter
Extend your amiga RGB video signal to two display units - screens, monitors, etc, simultaneously
BOM Rev. B
---------
Reference | Name/Value | Package/Footprint | Notes
-|-|-|-|
U1 | THS7374IPWR | TSSOP-14_4.4x5mm_P0.65mm | [THS7374IPWR](https://www.mouser.com/ProductDetail/595-THS7374IPWR)
U2 | 74HCT2G17 | TSOP-6_1.65x3.05mm_P0.95mm | [HCT2G17GV125](https://www.mouser.com/ProductDetail/771-HCT2G17GV125)
U3 | 74HCT2G14 | TSOP-6_1.65x3.05mm_P0.95mm | [HCT2G14GV125](https://www.mouser.com/ProductDetail/771-HCT2G14GV125)
U4 | 74LVC1GX04GV X-TAL DRIVER | TSOP-6_1.65x3.05mm_P0.95mm | [LVC1GX04GV125](https://www.mouser.com/ProductDetail/771-LVC1GX04GV125)
Y1 | 18pF Crystal 28.6363 MHz (NTSC) or 28.375 MHz (PAL) | 3.2 mm x 2.5 mm | [ECS-286.3-18-33-JEM-TR](https://www.mouser.com/ProductDetail/520-286.3-18-33-JEMT) (NTSC)
[ABM8-28.375MHZ-B2-T](https://www.mouser.com/ProductDetail/815-ABM8-28.375-B2-T) (PAL)
J1 | D-SUB DB23| DB23_Female-Connector | [Female 23 PIN DB23](https://www.aliexpress.com/item/1005007020706331.html)
J2 | DSUB-15-HD | HD_Female_Horizontal | [VGA connector](https://www.aliexpress.com/item/1005007383371077.html)
J3 | 9 Pin Mini Din Connector | Right Angle TH Mini Circular DIN Receptacle | [9pin Mini Din](https://www.aliexpress.com/item/1005005737270650.html)
J4 | PJ-320A | DIP 3.5mm Headphone Audio Socket 4Pins Audio interface | [PJ-320A](https://www.aliexpress.com/item/4000661212458.html)
J5 | MSK12D19 | 3Pin Slide Toggle Switch Pitch_2.5mm | [MSK12D19 SMD](https://www.aliexpress.com/item/1005006482584650.html)
J6 | MSK12D19 | 3Pin Slide Toggle Switch Pitch_2.5mm | [MSK12D19 SMD](https://www.aliexpress.com/item/1005006482584650.html)
J7 | Right angle Single-Pin Header | 0.64 mm square pin angled | pin for a flylead back to switchable Agnus pin 41 (or its pad on motherboard, e.g. JP4 on A500 Rev.6A)
JP1 | Solder_Jumper | | Solder Jumper for setting above pin (J7) to either /XCLKEN or OE-signal (inverted /XCLKEN signal).
C1 | 100uF Radial Pitch_2.5mm | Capacitor TH Radial_D5.0mm_P2.50mm | e.g.
[ECA-1AM101](https://www.mouser.com/ProductDetail/667-ECE-A0JKA101I)
[ECE-A0JKA101I](https://www.mouser.com/ProductDetail/667-ECA-1AM101)
Bend down flush to board before soldering
C2-C6 | Ceramic Capacitor 0.1uF = 100nF | 0805 | e.g. [CL21B104KACNFNC](https://www.mouser.com/ProductDetail/187-CL21B104KACNFNC)
C7-C8 | Multilayer Ceramic Capacitors MLCC - 32pF | 0603 | [06031A320FAT2A ](https://www.mouser.com/ProductDetail/581-06031A320FAT2A) for oscillator circuit
RN1-RN2 | 75 Ω RES ARRAY 4 Resistors | 1206 | [CAT16-75R0F4LF](https://www.mouser.com/ProductDetail/652-CAT16-75R0F4LF)
R1 | 330 Ω | 1206 | Series resistor on C-sync line
R2-R4 | 10k Ω | 1206
R5 | Resistor 2.2M Ω | 0603 | Resistor in oscillator-circuit
R6 | Resistor 1k Ω | 0603 | Resistor in oscillator-circuit
Housing | 2 x Plastic Shell Cover | For DB23/DB25 plug | [Aliexpress](https://www.aliexpress.com/item/1005004717091904.html)
4 x PinHeader | PinHeader Board Weight/Level Support | 3-pin 2.54 mm pitch single row | Move the plastic guard to leave ~7.5 mm of pin before soldering in order to hold board in perfect level inside the housing
***
***
If you use jumper-wire from JP1-pin then you bridge it either with the left pad or the right pad depending on your setup:
1. Motherboard has PAL oscillator and Adapter has NTSC oscillator = bridge JP1-pin with XCLKEN-pad (PAD 1)
2. Motherboard has NTSC oscillator and Adapter has PAL oscillator = bridge JP1-pin with OE-pad (PAD 3)
Please note, using a jumper-wire is completely optional, You can switch ECS Agnus in Early Startup menu or with software such as Degrader and then you only control the external XLCK-crystal enable or disable via the switch on the adaptor. However it can be more convenient to have both tasks controlled from one single switch, hence connecting a jumper-wire.
***
Suitable SCART-lead to use with the adapter (originally for the SEGA Mega Drive 2, (Genesis 2) with AC coupling inside)
https://www.aliexpress.com/item/1005007360209844.html
***
Filter OFF vs. Filter ON
With the THS7374's filter activated you can clearly see that the vertical jailbars are gone (right picture).
***
When ordering from JLCPCB select:
Specify Layer Sequence: Yes
L1(Top layer): F_Cu.gbr
L2(Inner layer1): GND_Cu.gbr
L3(Inner layer2): VCC_Cu.gbr
L4(Bottom layer): B_Cu.gbr
Remove Order Number:
Specify a location
This will notify JLC where to put the order number, they will replace the "JLCJLCJLCJLC" silkscreen label.
***