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How to Make an AC Power Filter

AC power filters are commonly used in circuits which convert one type of power to another and for filtering out unwanted harmonics in AC power systems. These filters come in a number of different sizes and circuit configurations. AC to DC converters use AC filters to reduce the amount of ripple voltage present after conversion. This helps create a more constant voltage. This is important. If the voltage is not kept at a relatively stable level, it could damage whatever load is attached to the power converter.

Things You'll Need

AC to DC power conversion circuit (unregulated and unfiltered)
Capacitors

Instructions

- 1
  Set the AC to DC power conversion circuit on the work table. This circuit should be composed of a power transformer with an AC plug on the primary side and a bridge rectifier on the secondary side. The output from the bridge rectifier is unfiltered DC power. This power oscillates from 0 to 12 volts if this is a 12-volt circuit.
- 2
  Connect the positive terminal of the capacitor to the positive terminal of the bridge rectifier to connect a 1000 micofarad capacitor across the output side of the bridge rectifier.
- 3
  Connect the negative terminal of the capacitor to the negative terminal of the bridge rectifier. When the voltage goes from 0 to 12 volts, the capacitor will charge. When the voltage drops from 12 volts to 0 volts, the capacitor will discharge its voltage and level out the voltage output of the circuit.

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