SPICEBridge

Design an RC low-pass filter with a cutoff frequency of about 1 kHz, generate an ngspice netlist, run an AC simulation, and provide the frequency response with key parameter notes.

A runnable ngspice netlist, simulation setup, a summarized frequency response, and a check of whether the cutoff target is met.

Create a common-emitter amplifier with these requirements: 12 V supply, midband voltage gain above 20, and a 10 mV sine-wave input. Generate the netlist, simulate it, measure the gain, and verify whether it meets the spec.

The amplifier netlist, simulation results, the measured gain value, and a conclusion on whether the design meets the requirement.

Here is a Colpitts oscillator netlist. Check why oscillation does not start, identify likely issues, adjust component values, rerun the simulation, and compare the before-and-after results.

A diagnosis of the issue, recommended changes, an updated netlist, and a comparison of waveforms or startup behavior after rerunning the simulation.