This post describes a circuit that has a capacitive input sensor and a switching transistor at the output PNP. When…

A band Stop Filter known also as a Notch Filter, blocks and rejects frequencies that lie between its two cut-off…

The state variable filter is a type of multiple-feedback filter circuit that can produce all three filter responses, Low Pass,…

Second Order (or two-pole) Filters consist of two RC filter sections connected together to provide a -40dB/decade roll-off rate. Second…

In the previous filter tutorials we looked at simple first-order type low and high pass filters that contain only one…