Capacitor Input Filter: Nothing more than a capacitor across the load resistor. This type of passive filter is the most common. Related posts: Primary filter or Surface filter Halogen lamp Bootstrapping Active Loading Bypass filter Diesel Particulate Filter (DPF) Bypass Capacitor Active Filter Work teams Capacitor Discharge Ignition (CDI) D-Jetronic AC Load Line Bessel filter Chebyshev Filter Thyristor Universal joint Butterworth filter Common rail injection Bridge Rectifier Active-load resistor Read more articles Previous PostBypass Capacitor Next PostCascaded Stages