Simple audio booster circuit diagram
This small audio booster circuit has a maximum gain of around 22 dB (voltage gain). The frequency response of the amplifier is decided primarily by the value of just a few components, primarily C1 and R1. The values within the schematic design present a response of ?3.0 dB from about 120 Hz to higher than 20,000 Hz. In fact, the frequency response is ruler flat from about 170 Hz to more than 20,000 Hz; it is the low end that deviates from a flat frequency response.