Balanced microphone preamplifier

Photocoupler

A balanced microphone input is an essential design feature that effectively reduces unwanted clicks, hum, and noise. This configuration ensures a cleaner signal by canceling out interference through differential signaling. To achieve optimal performance, resistors R6 and R13 should be matched with R5 and R12 respectively. The typical values for these resistors range from 10kΩ to 22kΩ, depending on the specific application and desired gain. Proper resistor selection not only improves sound quality but also enhances system stability. Always double-check your component values during the layout phase to avoid signal distortion or imbalance.