Example circuits written in Circom used for testing. One basic, multiplier2, and another one slightly more involved, keccak256. The former is a good minimal circuit to test things end to end. The latter is useful for benchmarking.
To compile circuits, run ./scripts/compile.sh <directory> <circom-circuit>. For example, ./scripts/compile.sh multiplier2 multiplier2.circom.
To run a trusted setup, run ./scripts/trusted_setup.sh <ptau> <circuit-name>. For example, ./scripts/trusted_setup.sh multiplier2 08 multiplier2.
Both of these actions are done as part of the ./scripts/prepare.sh script in the root directory multiplier2 and keccak256.