| Electronics > Beginners |
| Recreating mod chip designed for the Playstation 1. |
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| Katcher:
--- Quote from: KL27x on November 05, 2018, 10:01:22 pm ---OK, well, if you are using the full featured PCB CAD, you typically "route" your traces rather than drawing wires. You change layers while routing and the via automatically appears. But if you're just drawing copper wires, then I guess it can be trickier. Another tidbit, here, and a bit of a pet peeve. Complex routing looks cool, but on a tiny board like this, the routing creates a considerable kerf. If you left the board rectangular, V-scoring would save a bit of money in higher volumes. --- End quote --- I'm using EasyEDA and only just figured out how to do what you just described with it a minute ago. I'm just gonna stick with how I'm doing it with this design however. Seems to be the simplest option for now. And I'm not really going for complex routing if your on about what I'm wanting to do with the capacitor. I was just wondering if the way I'm connecting it all(Capacitors to Pad 1 and 8 then Pads 1 and 8 to their respective pin) was maybe unnecessary. What's V-scoring though? |
| tsman:
Somebody already mentioned it near the top of this thread but your PCB is just breaking out the SMD IC pins to bigger pads and has a decoupling capacitor. You can get SOIC 8 breakout PCBs for very cheap. The decoupling capacitor probably isn't even necessary. If you're doing this to learn some PCB design then that is fine as well obviously. |
| Katcher:
The plan is to recreate the modchip I bought initially. I doubt I could buy a PCB exactly like the one I'm trying to recreate. I appreciate the help but sadly at this point it's moot. |
| KL27x:
"Routing" has two meanings here. Signal routing in software is the one thing. But in the other post I was referring to the board outline being routed by a CNC milling bit, vs V-score, which is making a V shaped groove partway through the PCB material. The cost for tab routing isn't really anything to write home about, but the kerf can add up when the board is so tiny. That small difference might mean the difference btn fitting say, 12x18 pieces on the stock sized copper clad they use in a machine, vs fitting 13x19, or about 14% more boards to the same size raw material. Not that it matters if you are just making 10 board for yourself. Go nuts. The way you did the capacitor is totally fine, but you could also make a more direct connection for the caps, if you wanted the absolute minimum ESR for your decoupling cap. It really doesn't matter; just a note because you asked. |
| james_s:
A decouple capacitor should always be wired directly to the power and ground pins of an IC, as short and direct as possible. In this application it is probably not critical but in things that really need good decoupling those long spindley traces between the IC pins and capacitor would wreak havoc. |
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