* Simple board netlist with one subcircuit
* Has connectors J1 (power), J2 (signal I/O), and test point TP1

.subckt amplifier_board VIN GND VOUT SIGNAL_IN
* Internal components (passives, ICs — not relevant to wiring)
R1 VIN N001 10k
R2 N001 GND 10k
U1 N001 VOUT GND VCC opamp

* Boundary components (connectors/test points visible at board edge)
J1 VIN GND PWR_CONN
J2 SIGNAL_IN VOUT SIG_CONN
TP1 N001
.ends amplifier_board