Ultrasonic Pest Repeller

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These emit noise to confuse or agitate insects or animals.

This is one of the better and more popular brands. It emits bursts of pulses at different frequencies. I did not find any spider webs inside this unit:

Circuit Diagram aka Schematic reverse engineered from circuit board

Here is a higher end version of the same thing, with a few extra user selectable settings to allow audible as well as ultrasonic output so it can be more effective against animals:

Circuit Diagram aka Schematic reverse engineered from circuit board

And a cheapo one that runs directly off the AC line:

Circuit Diagram aka Schematic reverse engineered from circuit board

Safety, accuracy and completeness of information provided herein is not guaranteed,
so be inspired by it but do not use it as a basis for experimentation or other actions.

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