👉 In digital signal processing, a preamplifier is an electronic circuit that amplifies the input signal by multiplying it with a gain. It's used to achieve high output levels and can be applied in various applications such as audio, video, or RF (Radio Frequency) systems. The term "preamplifier" refers to any device or component that converts a low-level signal into a higher level. This process is often done by adding a voltage or current signal to the input signal, which