I suppose the frequency will be above 20kHz. Does it need a second amplification to be accurately read by the multimeter?
these are the exact specifications given:
Specifications and Requirements
1. The loudspeaker should be at least 2 meters far from microphones.
2. The amplitude of the sinusoidal wave which is applied to the loudspeaker should be equal
or less than 5 Vpp.
3. The distance (d) between the microphones should be Lambda/ 2. Consult your assistant for
operation frequency.
4. The direction angle calculation should be done using “Agilent-VEE”.
Allowed Circuit Elements
You may use a loudspeaker, microphones (without embedded pre-amplifier), transistors, op-amps,
resistors, capacitors, inductors, diodes in your circuit. Other ICs (Integrated Circuits) are not allowed.