Sonarca Sound Recorder is a straightforward tool for recording sound input to WAV or MP3 audio files.
The program is easy to set up. Choose the input device, and the specifications of the output file (mono or stereo, bit resolution, sampling frequency and so on) and that's just about it. You can then just use the large Record, Pause or Stop buttons to start and end recordings as you require.
Alternatively, you can also tell Sonarca Sound Recorder to automatically stop recording after some defined period of time, perhaps useful if you won't be around and don't want to leave the recorder running indefinitely.
Important: Sonarca Sound Recorder is bundled with an adware package called RelevantKnowledge. This monitors actions on your PC, which the licence says includes "internet usage information, basic demographic information, certain hardware, software, computer configuration and application usage information about the computer on which you install RelevantKnowledge". If this concerns you be sure to read the licence agreement before you install the program, just so you're clear about exactly what's involved (and of course cancel the installation if you're unhappy).