Advanced Circuit to Processing Unit Chain

Lore & Background

In the alien world the Spaceman calls home, the Processing Unit represents a quantum leap in computational density. While basic circuits let a factory sort and route items, Processing Units enable the factory to think, to plan, to coordinate hundreds of robotic arms in concert. The recipe itself tells a story of material convergence: the Advanced Circuit is a marriage of electrical conductivity (copper) and structural polymer (plastic), while the Optical Debrid demands precision glass and silicon, and the Battery anchors the whole assembly in electrochemical energy. Fans often describe the moment they first complete a Processing Unit as the point where Factorio stops being a crafting game and starts being a systems-engineering puzzle. The chain forces you to build oil infrastructure, chemical plants, and smelting lines that dwarf everything you constructed in the early game. The Advanced Circuit assembler, sitting at the junction of copper smelting and plastic production, becomes a visual landmark in the factory—a small machine whose output ripples outward through dozens of downstream assemblers. There is a quiet satisfaction in watching the chain steady-state: copper plates and plastic bars flowing in lockstep, the assembler's little light blinking as it stamps out circuits, and then the larger Processing Unit assemblers swallowing those circuits alongside glass, silicon, and lithium to produce the dense green-and-gold modules that will soon be slotted into Robotic Arms and Logistic Robots.

In Their Own Story

The Spaceman wiped grease from his forehead and stared at the new row of assemblers humming to life. Twenty Advanced Circuit assemblers, each one a small orange box with a steady green light, fed by two conveyor arteries—one carrying copper plates from the smelter bank, the other carrying plastic bars from the chemical plant. The plastic line was the fragile one; a single clogged oil pump could starve the whole row within minutes. Fifty glass. Ten polysilicone. Ten lithium. Ten iron plates. All of it, just to feed the three Processing Unit assemblers at the end of the line, where the real product was born. A Logistic Robot, freshly assembled and still warm from its own recipe, zipped past on a rail, carrying a single Processing Unit toward the storage chest. The Spaceman let out a breath he didn't realize he'd been holding. The factory was alive, and it was hungry, and it would be hungry forever.

Reader's Guide

For 1 Processing Unit you need: 20 Advanced Circuit, 20 Plastic Bar, 10 Optical Debrid, 10 Battery—all assembled in an Assembler. Advanced Circuit (Assembler): 10 Copper Plate + 5 Plastic Bar. Upstream, Copper Plate comes from a Smelter (Copper Ore); Plastic Bar comes from a Chemical Plant (1 Petroleum + 1 Water), where Petroleum is refined from Crude Oil in an Oil Refinery fed by an Oil Pump. Optical Debrid (Assembler): 5 Glass + 1 Polysilicone. Glass is smelted from Sand (itself smelted from Stone). Polysilicone is produced in a Chemical Plant from 1 Silicon (smelted Sand) + 1 Coal. Battery (Assembler): 1 Lithium + 1 Iron Plate + 1 Copper Plate. Iron Plate is smelted from Iron Ore; Lithium is mined directly. The Plastic Bar / oil-petroleum sub-chain is the most common bottleneck, as it requires the longest infrastructure.

Did You Know?

• The same Sand resource is smelted into both Glass (for Optical Debrid) and Silicon (for Polysilicone), meaning a single Sand smelter line feeds two different downstream chemical processes.
• Processing Units are a direct prerequisite for the Robotic Arm and Logistic Robot recipes, meaning this entire chain must be stable before the player can build any automated logistics network.