| ... | ... | @@ -10,16 +10,20 @@ Knowledge gleaned from failure. |
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## Vendors
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When ordering PCBs, review the [stack layout](https://docs.oshpark.com/services/four-layer/), tolerances, and the substrate material (FR-4 or [Rogers](https://morepcb.com/rogers-pcb-material/)) for the vendor.
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| Vendor | Pros | Cons | Resources |
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| ------ | ------ | ------ | ------- |
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|[Oshpark](https://oshpark.com/)|Trusted, quick, purple, USA|Substrate spikes on the edges|[4-Layer Coplanar Waveguide](https://hackaday.io/project/162998-the-rise-and-fall-of-pulses/log/168604-osh-park-4-layer-coplanar-waveguide)|
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|[Circuit Graphics](https://www.circuitboard.com/)|Quick, USA (SLC), Cheap, Lets us use our material|Difficult with *hard* substrates (Rogers)||
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- [Oshpark](https://oshpark.com/)
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- Pros: Trusted, quick, purple, USA, [Design Resources](https://hackaday.io/project/162998-the-rise-and-fall-of-pulses/log/168604-osh-park-4-layer-coplanar-waveguide)
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- Cons: substrate spikes on the edges
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- [Circuit Graphics](https://www.circuitboard.com/)
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- Pros: Quick, USA (SLC), Cheap, Lets us use our material
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- Cons: Difficult with *hard* substrates like Rogers
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- Cons: Difficult with *hard* substrates (Rogers)
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- [Aisler](https://aisler.net/)
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- Pros:
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- [PCBWay](https://www.pcbway.com/)
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- Pros: Reasonable job with Rogers materials
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- Pros: Reasonable job with Rogers
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- Cons: China
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- Other Chinese vendors [Fast-PCB](https://www.fast-pcb.com/), [JLCPCB](https://jlcpcb.com/)
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- Needs Review: [Advanced Circuits (4pcb)](https://www.4pcb.com/), [PCBgogo](https://www.pcbgogo.com/), [Sunstone](https://www.sunstone.com/), [Avanti Circuits](https://www.avanticircuits.com/), [PCBcart](https://www.pcbcart.com/), [ACE PCB](https://ace-pcb.com/)
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- DO NOT BUY: Aisler, nextPCB
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