Capacitor with Irregular size dielectric

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SUMMARY

It is feasible to construct a capacitor using a dielectric that does not match the size of its conducting plates. This approach can be advantageous in applications where cost reduction is essential, as it allows for looser manufacturing tolerances. A practical application discussed involves using a car window as the dielectric material in a security alarm system, where breaking the glass alters the capacitance and triggers the alarm circuit. Capacitive sensing techniques are integral to this design, enhancing its functionality.

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TenJuu
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Is it possible to make a capacitor with a dielectric not of the same size with its conducting plates?
 
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Welcome to the PF. :smile:
TenJuu said:
Is it possible to make a capacitor with a dielectric not of the same size with its conducting plates?
Sure. But can you think of any practical reason why you would WANT to do that? What kind of dielectric change like you suggest would make the capacitor better in some way?
 
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Well it certainly would be cheaper to construct if you don't require tight tolerances...
 
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berkeman said:
Welcome to the PF. :smile:

Sure. But can you think of any practical reason why you would WANT to do that? What kind of dielectric change like you suggest would make the capacitor better in some way?
We are having research on making a security alarm with low technology. By making the car window as our dielectric and having small conducting plates sandwiching it. When the glass is broke it will cause a change in capacitance thus triggering our circuit.
 

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