Electromagnetic (EMI) filters and radio frequency interference (RFI) filters purify signals by attenuating the high-frequency RFI (typically 150kHz and up) and passing the low frequency EMI

Signal filters block or decrease (attenuate) unwanted frequencies or signal wave characteristics

Power or line conditioners regulate, filter, and suppress noise in AC power for sensitive computer and other solid state equipment

Harmonic filters isolate harmonic current to protect electrical equipment from damage due to harmonic voltage distortion.

Power filters are electronic circuits designed to locate and eliminate surges, harmonic transient currents, spikes, and other unwanted signals in power distribution systems and electrical equipment such as computers, television sets, and other devices

Voltage and current signal conditioners amplify or modulate AC or DC current or voltage and process signals to improve transmission

DC power supplies accept an input power and output the desired form of DC power.