Ultrasonic Pest Repeller - These emit noise to confuse or agitate insects or animals HOME

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

I do not gaurantee the accuracy or safety of any information herein.
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Do not experiment with or build any of the above circuits.