For a hobbyist, it has always been fun to activate or automate through a clap or a whistle . A whistle sometimes can act like a voice recognition actuator as the frequency varies from person to person. However, for this use the tuning is to be done around 1700 Hz, a pitch that is somewhere near to the middle C octave of the piano chords. A condenser microphone acts as the audio sensor and produces a few milli - volts of current to activate the electrical actuator like a relay. For this it has to be supported by a transistor or FET. Driving such a switch with the resultant milli-Volt from the condenser microphone is not possible. Hence an overall gain 4000 times larger is needed to be divided into two amplifier sections having gain values of 65 each. Resistors denoted by the values R1, R2 and R3 are responsible for the individual gain of the amplifiers and are 1.1K, 1.2K and 15K respectively. Thus we arrive at the formula given below · R1 = Q/(G*C*2*Pi*F) = 8/(65*.01^-6*6.28*17...