The transmitter circuit was simulated in PSPICE to identify and solve the current supply problem. The connection between the output of the oscillation circuit to the “tank” circuit was found to be incorrect, therefore leading to a lack of current flow to the inductors. This problem was fixed by altering the wire connections, as they were not connected in the right way initially. However, no frequency was measured at the output of the oscillation circuit, while there was also no waveform displayed on the oscilloscope. The recorded voltage output from the oscillation circuit was also DC (and not AC as required).
Figure 3: Simulation schematic for transmitter circuit using PSPICE
It was also important that the number of turns for each coil (transmitter & receiver) were discussed and calculated using the appropriate formula. The group decided to follow a concept that had already been observed in previous modules (electromagnetism).
The inductive loops were calculated using the formula below:
The two coils were then put together in the same style, with a different number of turns required for both. A similar style to which these loops were made can be observed from the image in figure 4.
Figure 4: Chosen inductive loop design
Once this problem had been solved, the group planned to continue working on the simulation in PSPICE to solve any other potential circuit problems.
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