The project is based on the concept of condenser MIC. The MIC is used as sensors to sense the incoming audio signals and convert them to appropriate electrical signals. The output of the MIC is then passed to the transistor T1 passing through a capacitor C1. This capacitor is used to block the DC component of the signal. Resistor R1 is also used in the circuit which provides the required biasing to the condenser microphone. The biasing configuration of transistor T1 is from collector to the base which is accomplished through resistance R2, providing negative feedback to the base of T1.
Filed Under: 555 Timers, Electronic Projects