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?:
That is all for now. Will ask further questions as I try to make sense of the schematic myself. Thanks!
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?:
So as for the 1st questions:
- 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.
That is all for now. Will ask further questions as I try to make sense of the schematic myself. Thanks!