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Impedance matching RGB & Sync PCB for NeoGeo (C)MVS

author: n00b
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2 layer board of 1.31 x 0.87 inches (33.2 x 22.0 mm)
Uploaded: September 25th 2018
Shared: September 25th 2018
Total Price: $5.65

The PCB offers the option to connect a consolized NeoGeo MVS with impedance matching RGB and Sync signals to a regular TV.

If the CMVS is connected to a TV by using a SCART cable (e.g.) no additonal parts (capacitors, resistors) are needed inside the SCART plug.

If the 5V output of the PCB is connected to SCART pin 16 (RGB switching) an additional 180 ohm resitor is needed.

SMD Parts Value Footprint
R1 9.53KΩ 0805
R2, R3 & R4 7.5KΩ 0805
R5, R6 & R7 1.2KΩ 0805
R8 620Ω 0805
R9, R10 & R11 5.1MΩ 0805
R12 10KΩ 0805
R13, R14, R15 & R16 75Ω 0805
C1, C2 & C3 82nF/16V 0805
C4 (tantalum capacitor) 330uF/10F 2917 or 7374
C5 100nF/16V 0805
C6 47uF/6.3V 0805
THS7374 (or THS7376) TSSOP14

Jumper J1: The THS7374 has four SD-video filters (used for /CSYNC, R, G and B).

All four filters can be bypassed by using jumper J1. close J1: internal filters are NOT bypassed leave J1 open: internal filters are bypassed

It is not possible to set the four SD-video (THS7374) low pass filters individually!

Normally, you don’t need a LPF inside your MVS output. There are just a few capture cards out there who don’t have a anti aliasing filter for is ADC inputs. There you have to have the LPF turned on.

On analog devices a LPF is not needed. On professional upscaling solutions like the Framemeister and OSSC you have an anti aliasing filter prior to its ADC circuits. This means you can leave the filters of the THS7374 off, too.

The picture looks great! :)

alt text

The PCB offers the option to connect a consolized NeoGeo MVS with impedance matching RGB and Sync signals to a regular TV.

If the CMVS is connected to a TV by using a SCART cable (e.g.) no additonal parts (capacitors, resistors) are needed inside the SCART plug.

If the 5V output of the PCB is connected to SCART pin 16 (RGB switching) an additional 180 ohm resitor is needed.

SMD Parts Value Footprint
R1 9.53KΩ 0805
R2, R3 & R4 7.5KΩ 0805
R5, R6 & R7 1.2KΩ 0805
R8 620Ω 0805
R9, R10 & R11 5.1MΩ 0805
R12 10KΩ 0805
R13, R14, R15 & R16 75Ω 0805
C1, C2 & C3 82nF/16V 0805
C4 (tantalum capacitor) 330uF/10F 2917 or 7374
C5 100nF/16V 0805
C6 47uF/6.3V 0805
THS7374 (or THS7376) TSSOP14

Jumper J1: The THS7374 has four SD-video filters (used for /CSYNC, R, G and B).

All four filters can be bypassed by using jumper J1. close J1: internal filters are NOT bypassed leave J1 open: internal filters are bypassed

It is not possible to set the four SD-video (THS7374) low pass filters individually!

Normally, you don’t need a LPF inside your MVS output. There are just a few capture cards out there who don’t have a anti aliasing filter for is ADC inputs. There you have to have the LPF turned on.

On analog devices a LPF is not needed. On professional upscaling solutions like the Framemeister and OSSC you have an anti aliasing filter prior to its ADC circuits. This means you can leave the filters of the THS7374 off, too.

The picture looks great! :)

alt text

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      Hey there! Before ordering, make sure you have all all the info you need to complete and use this design. This usually means a component list, and sometimes additional information such as assembly notes, source code, or usage guides.
      Since this is a project designed by a community member, it may contain design errors that prevent it from working as intended. OSH Park cannot place any guarantees about the functionality or correctness of the design.
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