Circuit Assembly

Week 4 Milestone Deliverable

Circuit Construction Deliverable

The video below illustrates the Transduction circuit functioning. There are some notable issues with the output that must be compensated for, and were discovered through this test. Firstly, it is notable in the first portion of this video that the signal suddenly changes from an intended signal to a different one. This is caused by the thermal shutoff function of the amplifier, which occurs becasue the current draw of the sensor is large. Additionally, the receiveing circuit utilised a 10X multimeter probe which when compined with the preamplifier caused noticable distortions in the signal. Future efforts in adjusting the output load, providing heat sinking, and connecting the preamplifier circuit, are predicted to improve the response of the system.

Below is an image showing the assembled transduction circuit. The green box indicates the amplifier stage of the circuit, the red box indicates the square-to-sine wave converter stage, and the blue box indicates the oscillator circuit.

The following is an image of the sine wave generated by the above circuit with the Transducer connected. Of note in this image is the difference in voltage of the input sine wave from the oscillator and sine wave converter portion of the circuit (yellow) and the output measured on the leads of the transducer (blue). The gain is ~12x, bringing the voltage from 3.2 Vp-p to 38 Vp-p. Additionally the frequency is noted at ~204 kHz, which is well within the tolerances of the sensor.

The below image displays the assembled receiver circuit. This circuit contains two amplification stages and a diode. This circuit must still be connected to the receiver and microcontroller to function. However this image illustrates the Circuit assemble, and will be ready for testing when the system undergoes a full system test within the next few weeks.