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How to connect capacitors

Various capacitors

The capacitors can be connected in series and in parallel.

Resulting capacitance is calculated in both formulas.

This compound is used in cases where there are no capacitors with the required parameters, but there are others.

You will need

  • - payalnik-
  • - wires-
  • - kusachki-
  • - Calculator.



Any capacitors can be connected only ifwhen they are weak and disconnected from the rest of the circuit elements. Do not discharge their short circuit - use an appropriate load. Connect it insulated cables without touching live parts. Discharge capacitor, voltmeter, check that it really is low, and using probes with insulated wires and hands and avoid touching live parts.


Prior to the calculation of the capacitorsshould be transferred to the same unit. In this case, use of the SI system is irrational, as a member of her unit - farad - is very large. Depending on what kind of capacitor you connect, you can use the pF, nF or microfarads.


Connecting capacitors in parallel, resultingcalculate the capacity, the capacity simply summing all capacitors. Operating voltage of the same design will be equal to the minimum operating voltage of its member capacitors.


In a series connection of capacitorsfirst get the reciprocal of the capacity of each of them, and then add these values, and then find the reciprocal of the sum. The reciprocal of a unit called the result of dividing by the number. This looks like: Crezult = 1 / (1 / C1 + 1 / C2 + ... + 1 / Cn), where Crezult - resultant capacitance and C1 ... Cn - capacitors in serial chain. this design is more difficult with an operating voltage. In theory, a series connection of capacitors of the same capacity is sufficient to lay down their operating voltages, and if their capacity is different, the voltage distributed to them inversely proportional to the capacitance. In practice, the variation of parameters and leakage can lead to unpredictable stress distribution. Therefore, the most reliable to follow the same rule as in the parallel connection: the operating voltage is equal to the entire structure of the operating voltage of the capacitor, which is the smallest.


When a mixed (serial-parallel)connection capacitors separate structure on the group of capacitors connected in series or only parallel only. Calculate the parameters of each of the groups, and then treat it as a single capacitor with the appropriate parameters. Then look at how connected these groups - in series or in parallel - and make the appropriate formula for the calculation of the parameters of the assembly. Polar connect the capacitors to the same polarity and the same polarity switch circuit design in which it will work. Linking anti-series two polar capacitor even the same capacity for nonpolar is not recommended - variation of parameters and leakage can lead to their failure. At least one polar polar capacitor makes the entire structure.


Sometimes electrolytic capacitors shunt(Connected in parallel) ceramic is much smaller capacity. In this case, assume that either the formulas not necessary because the addition of capacity can be neglected. And doing so is not to increase capacity and to filter high frequency noise, which is not cleaned for electrolytic capacitors because of the parasitic inductance.

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