Martin Jones Sync Pulse Generator: A Layman in Need of Help with a Schematic

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    • Martin Jones Sync Pulse Generator: A Layman in Need of Help with a Schematic

      I would like to build Martin Jones's Sync Pulse Generator so that I can solder it in-line on my JAMMA harness. Seems the Sanwa PFX monitor in my NNC is not compatible with sync on some of my PCB's (mainly, the Taito F3). I am at a complete loss as to how to approach this since I have no engineering skills to speak of. This will probably be a longer than usual journey as I complete this but I would appreciate the help.

      Firstly, the final product shows two IC's plus various components. Also, the same is shown over jammaarcade.net. However, the bill of materials lists out 4 IC's, which I believe are sub-"modules" in the same IC's?:

      Martin Jones wrote:


      • IC1B is a monostable which triggers on every sync pulse, generating a pulse 4.7 microseconds long. These become the new horizontal sync pulses.
      • IC2B combined with D1, R3 and C3 form a sync separator which triggers the monostable in IC1C only on sync pulses which are longer than about 40 microseconds.
      • IC1C is a monostable which generates vertical sync pulses about 200 microseconds long.
      • IC2E combines the new horizontal and vertical sync pulses into a new sync signal.

      So as for the 1st questions:
      1. IC1B and IC1C are simply the same IC, a 74LS221, correct?
      2. IC2B and IC2E are simply the same IC as well, a 74L86, correct?
      That is all for now. Will ask further questions as I try to make sense of the schematic myself. Thanks!
      Arcade Multi Systems:
      • Sega: ST-V, Naomi w/Net Dimm, Naomi w/CF Boot (DIY and OG versions), Taito: G Net, Taito F3, Taito Type X², Capcom CPS2, Capcom CPS3, Neo Geo MVS 4-Slot
      Favorite Arcade Genres (in order):
      • Fighting games, Shmups, Light-gun, Puzzlers, Driving
    • acblunden2 wrote:

      I would like to build Martin Jones's Sync Pulse Generator so that I can solder it in-line on my JAMMA harness. Seems the Sanwa PFX monitor in my NNC is not compatible with sync on some of my PCB's (mainly, the Taito F3). I am at a complete loss as to how to approach this since I have no engineering skills to speak of. This will probably be a longer than usual journey as I complete this but I would appreciate the help.

      Firstly, the final product shows two IC's plus various components. Also, the same is shown over jammaarcade.net. However, the bill of materials lists out 4 IC's, which I believe are sub-"modules" in the same IC's?:

      Martin Jones wrote:


      • IC1B is a monostable which triggers on every sync pulse, generating a pulse 4.7 microseconds long. These become the new horizontal sync pulses.
      • IC2B combined with D1, R3 and C3 form a sync separator which triggers the monostable in IC1C only on sync pulses which are longer than about 40 microseconds.
      • IC1C is a monostable which generates vertical sync pulses about 200 microseconds long.
      • IC2E combines the new horizontal and vertical sync pulses into a new sync signal.

      So as for the 1st questions:
      1. IC1B and IC1C are simply the same IC, a 74LS221, correct?
      2. IC2B and IC2E are simply the same IC as well, a 74L86, correct?
      That is all for now. Will ask further questions as I try to make sense of the schematic myself. Thanks!
      I made the post on JAMMArcade and build this device.There are only two ICs (74LS221 ans 74LS86), the four simbols on schematics are for the different gates of same IC (two per IC) :)
    • invzim wrote:

      Which chassis do you have? Name for JVS2JAMMA board

      The tri-sync helper should fix F3, but seem to confuse the KW0606 with CPS2. Just trying to get to the bottom of what works with what..
      Sanwa PFX. I think @radiantsvgun confirmed on your JVS2JAMMA thread or the NNC appreciation thread that the Sanwa PFX doesn't like tri-sync helper. I can't find the post though. Wish we could search threads on this forum.

      nam9 wrote:

      Also came across this as a possible solution to dodgy sync issues and such...
      Following with interest.
      I am going to get my hands on one that was put DIY'ed later this week. Hopefully, that will let me make sense of the schematic. It's starting to make more sense the more I look at it and research. But still in the dark.

      caius wrote:

      I made the post on JAMMArcade and build this device.There are only two ICs (74LS221 ans 74LS86), the four simbols on schematics are for the different gates of same IC (two per IC)
      Thanks caius. I know that is your site. I was thinking of paging you. But the question seemed too low-level to reach out to you yet. I'll get there though. It's starting to make more sense now. Silly question here though, do you think the schematic could have been composed better?
      Arcade Multi Systems:
      • Sega: ST-V, Naomi w/Net Dimm, Naomi w/CF Boot (DIY and OG versions), Taito: G Net, Taito F3, Taito Type X², Capcom CPS2, Capcom CPS3, Neo Geo MVS 4-Slot
      Favorite Arcade Genres (in order):
      • Fighting games, Shmups, Light-gun, Puzzlers, Driving
    • nam9 wrote:

      @acblunden2 you can pick one up from eBay or at least check which components are in play.
      I'm in the US. Shipping in Euros alone makes the price prohibitive.
      Arcade Multi Systems:
      • Sega: ST-V, Naomi w/Net Dimm, Naomi w/CF Boot (DIY and OG versions), Taito: G Net, Taito F3, Taito Type X², Capcom CPS2, Capcom CPS3, Neo Geo MVS 4-Slot
      Favorite Arcade Genres (in order):
      • Fighting games, Shmups, Light-gun, Puzzlers, Driving
    • Your assumptions are correct. There's two ICs, IC1 and IC2. Guessing he spread them over two parts to simplify drawing the schematic?

      Also note that R1 is meant to be 6.8K and not 680R. He mentions this mistake in a comment at the end.

      I'll whip up a PCB for this if you like? I'll supply the necessary files, you can then order the PCBs and make life easy for yourself.
    • Awesome, thanks so much @Frank_fjs! Doesn't need to have the switches like the eBay seller has done it. Martin Jones says it doesn't impact sync of non-impacted games so it will be wired in-line to my JAMMA harness going into the NNC as a permanent component. Let me know details as to whether you plan on making the components SMD or through-hole. I can start to build out a parts list on Digikey.

      Thanks again!
      Arcade Multi Systems:
      • Sega: ST-V, Naomi w/Net Dimm, Naomi w/CF Boot (DIY and OG versions), Taito: G Net, Taito F3, Taito Type X², Capcom CPS2, Capcom CPS3, Neo Geo MVS 4-Slot
      Favorite Arcade Genres (in order):
      • Fighting games, Shmups, Light-gun, Puzzlers, Driving
    • acblunden2 wrote:

      Thanks caius. I know that is your site. I was thinking of paging you. But the question seemed too low-level to reach out to you yet. I'll get there though. It's starting to make more sense now. Silly question here though, do you think the schematic could have been composed better?
      Schematics are good as they are.But Keep in mind this SYNC pulser is not the panacea for all issues hence some boards will still be probematic..
    • Frank_fjs wrote:

      I'd be inclined to use through hole, but can certainly utilise SMD if that's your preference?
      Through-hole is fine and easier for everyone. I am sure I won't be the only one ordering the PCB's from Osh Park.

      caius wrote:

      Schematics are good as they are.But Keep in mind this SYNC pulser is not the panacea for all issues hence some boards will still be probematic..
      Just need the Taito F3 working with the Sanwa PFX. I have this panel I want to play the Puzzle Bobble games with on my NNC.
      Arcade Multi Systems:
      • Sega: ST-V, Naomi w/Net Dimm, Naomi w/CF Boot (DIY and OG versions), Taito: G Net, Taito F3, Taito Type X², Capcom CPS2, Capcom CPS3, Neo Geo MVS 4-Slot
      Favorite Arcade Genres (in order):
      • Fighting games, Shmups, Light-gun, Puzzlers, Driving
    • For the KW0606 at least, plain CSYNC out of a modded tri-helper works with both F3 and CPS2. The CSYNC output of the mod is not regenerated, meaning KW0606 should in theory work with the F3 with no messing about at all.. This is via the DB15 connector.

      I could make something, but need the facts and details on which setups have issues with what. Would be awesome if you could dig out which chassis you have.
      FOR SCIENCE! I make and sell the Jammafier & other stuff, irkenlabs.com
    • New

      I have the Sanwa PFX (KW0606A) connected via the high-impedence 6-pin header. Don't put too much into it though. It is a rather small corner case. Martin Jone's Sync Pulse Generator will solve the problem I am having for my setup.
      Arcade Multi Systems:
      • Sega: ST-V, Naomi w/Net Dimm, Naomi w/CF Boot (DIY and OG versions), Taito: G Net, Taito F3, Taito Type X², Capcom CPS2, Capcom CPS3, Neo Geo MVS 4-Slot
      Favorite Arcade Genres (in order):
      • Fighting games, Shmups, Light-gun, Puzzlers, Driving
    • New

      More tooling and supplies than I am willing to invest now to check that out.
      Arcade Multi Systems:
      • Sega: ST-V, Naomi w/Net Dimm, Naomi w/CF Boot (DIY and OG versions), Taito: G Net, Taito F3, Taito Type X², Capcom CPS2, Capcom CPS3, Neo Geo MVS 4-Slot
      Favorite Arcade Genres (in order):
      • Fighting games, Shmups, Light-gun, Puzzlers, Driving