Impedance matching RGB & Sync PCB for NeoGeo (C)MVS
author: n00b
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! :)
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! :)
