CircuitSim
by Dankov
CircuitSim lets players build electronic circuits from component blocks and wires inside the game, then run a full SPICE simulation on them.
What it does
Players place component blocks in the world and connect them with wires. Once the layout is complete, CircuitSim runs a SPICE-based simulation of the circuit, so the behavior of the build can be checked without leaving the game world. The mod is built for Forge and is published for the 1.20.1 – 1.20.6 range, with the latest file 1.5.0 for 1.20.6 released on 2026-07-07.
Installation covers the server and each player's game. It is released under the GNU General Public License v3.0 only, and its source code is public. Files were first published on 2026-05-24, and the Forge loader is the only one supported, so no Fabric or NeoForge build exists for this mod.
Key features
Component blocks
Resistors, capacitors and inductors are available as placeable blocks that can be wired into a circuit.
Voltage and current sources
DC, sinusoidal (SIN) and pulse (PULSE) voltage sources sit alongside a current source for driving a build.
Controlled sources
Voltage-controlled and current-controlled sources are included, among them VCVS (E), VCCS (G), CCVS (H) and CCCS (F).
Wires and ground
Wire and ground blocks give the circuit its connections and a reference node for the simulation.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Testing a circuit before building it large
A player can wire a small design, run the simulation, and adjust component values before scaling the layout up.
Teaching electronics on a server
A server owner can give students a shared space where circuit behavior is simulated from real component models.
Who it’s for: Players who want to study or prototype electrical circuits inside Minecraft, and server owners who host Forge 1.20.x worlds with a technology focus.
Questions
Does CircuitSim need to be installed on the server?
Which loader does CircuitSim use?
Which game versions does CircuitSim support?
Is the source code of CircuitSim available?
In the catalog
CircuitSim is one of 8,499 Technology mods on ModsFinder, and one of 4,122 Technology mods for Forge. 11,154 mods support Minecraft 1.20.6.
Similar mods
What the author says
CircuitSim is a Minecraft Forge mod for version 1.20.1 that lets you build and simulate real electronic circuits inside the game. Place component blocks in the world, connect them with wires, and right-click the Simulate Block to run a full SPICE simulation powered by ngspice.
Official listing
- Modrinth page
- modrinth.com/mod/circuitsim
- Owner
- Dankov
- Published
- 2026-05-24
- Updated on Modrinth
- 2026-07-07
- Facts verified
- 2026-10-15