Aside from the capacitance, another thing to consider on how to select capacitors is the tolerance. If your application is very critical, then consider a very small tolerance. Capacitors come with several tolerance options like 5%, 10% and 20%. It is your call which is which.
Tolerance Range (ΔC) = Tolerance (%) × Nominal Capacitance (Cnominal) Here, Tolerance (%) is the specified percentage of capacitance tolerance. Nominal Capacitance (Cnominal) is the specified or desired capacitance value. For example, if you have a capacitor with a nominal capacitance of 100 µF and a tolerance of ±10%, the tolerance range would be:
Significance And Impact Capacitance tolerance is indeed important in most electronic circuits and applications. While it may seem harmless to ignore this specification, it can significantly impact circuit performance and functionality in precision circuits and applications.
A capacitor with a wide tolerance can lead to inaccurate timing and instability. Resonant Circuits: In resonant circuits, like those used in radios and filters, the resonant frequency depends on the precise values of the capacitor and inductor. Tolerance can shift this frequency, affecting the circuit’s performance.
A slight variation in capacitance may not significantly impact this function. However, in some cases, a tighter tolerance may be beneficial: High-Precision Applications: For critical applications where precise power factor correction and motor performance are paramount, a tighter tolerance capacitor might be considered.
Anywhere from 1% to 20% of the maximum capacitance. Check the data sheet. A tunable (rotating) capacitor consists of plates that are spaced apart by some measure. The spacing is what derives a given capacitance. By rotating extra plates in-between the stationary plates you reduce the spacing, thus changing the capacitance.
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For example, if you have a capacitor with a nominal capacitance of 100 µF and a tolerance of ±10%, the tolerance range would be: Tolerance Range (ΔC) = 10% × 100 µF = 0.1 × 100 µF = 10 µF. This means that the actual capacitance of the …
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To actually determine the minimum capacitance is a fairly straight-forward procedure. But you do need a means to measure the resonant frequency of a tuned circuit. …
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