How to calculate the CBB capacitor derating?

The editor in the Confidence Forum found a question that was often asked. How to calculate the CBB capacitor derating? There are also many active and enthusiastic respondents, but many of them answered the question, causing the questioner to be confused.

In fact, the derating of CBB capacitors is very simple to calculate. Three capacitors of equal capacity, respectively C1=C2=C3=C, connected in a triangle, arbitrarily measured AB/BC/CA, the total capacity will be 3C/2. (When measuring, the internal equivalent capacitor is C2 and C3 connected in series, and then connected in parallel with C1.) Then, by measuring, any capacity Cx between AB/BC/CA is known, and the capacity of each capacitor can be calculated: C=2Cx/3.

The method of judging whether the capacitor is damaged or derating can calculate the capacitance by measuring the compensation current on the capacitor, and then compare it with the actual one. In order to promote quality sound, CBB capacitors have been more and more advanced, and the price is not the most important factor. Therefore, the number and frequency of PP capacitors and PS capacitors used in audio equipment are also getting higher and higher.