This active splitter for RGB-21 (JAP SCART) allows the connections between one video source and two outputs.

VFS6VD81E221U31A RF/EMI filter

https://akizukidenshi.com/catalog/g/gP-04021/

２ＳＣ１８１５ NPN transistor

https://akizukidenshi.com/catalog/g/gI-06477/

220uF cap (polarized)

https://akizukidenshi.com/catalog/g/gP-04629/

10uF cap (polarized)

https://akizukidenshi.com/catalog/g/gP-04638/

0.1uF (100nF) cap

https://akizukidenshi.com/catalog/g/gP-10147/

７５Ω resistor

https://akizukidenshi.com/catalog/g/gR-08521/

330Ω resistor

https://akizukidenshi.com/catalog/g/gR-08530/

10KΩ resistor

https://akizukidenshi.com/catalog/g/gR-08550/

10Ω resistor

https://akizukidenshi.com/catalog/g/gR-08515/

5.6V ZENER DIODE

https://akizukidenshi.com/catalog/g/gI-17082/

1N4148 DIODE

https://akizukidenshi.com/catalog/g/gI-00941/

4.7KΩ resistor

https://akizukidenshi.com/catalog/g/gR-25472/

120KΩ resistor

https://akizukidenshi.com/catalog/g/gR-25124/

680Ω resistor

https://akizukidenshi.com/catalog/g/gR-25681/

LED (red & green)

https://akizukidenshi.com/catalog/g/gI-12605/

https://akizukidenshi.com/catalog/g/gI-11637/

USB B-type (optional)

https://akizukidenshi.com/catalog/g/gC-00161/

SCART connector

https://www.aliexpress.com/item/1005003039871749.html?spm=a2g0o.productlist.0.0.b8c1498fCs8qLZ&algo_pvid=a354c168-fcee-4564-89b9-602109b48b48&algo_exp_id=a354c168-fcee-4564-89b9-602109b48b48-5&pdp_ext_f=%7B%22sku_id%22%3A%2212000024737472546%22%7D&pdp_pi=-1%3B37.0%3B-1%3B-1%40salePrice%3BJPY%3Bsearch-mainSearch