Jason and Alon's Coil Corner

The prototype Oscillator is complete. The resulting frequency is around 3 kHz, and required some trial and error to output a relatively clean sine wave. Figure 1 shows the final oscillator design, and figure 2 shows the resulting waveform. There is still some distortion as the oscillator reaches the upper rail voltage of the op amp, but it shouldn't affect the rest of the detector system. Figure 1: Oscillator final design Figure 2: Oscillator waveform Figure 3: Oscillator circuit on breadboard

Here are a few updates on the work completed over break. Most importantly, the 3D-printed coil has been completed. The final dimensions are 11 cm diameter and 2 cm height. The winding also took a good amount of work to complete and resulted in some very sore hands. The completed coil can be seen in Figure 1. It consists of around 100 turns on the outside and twice that on the inside for increased signal sensitivity. Figure 1: Completed Coil The design for the amplitude detection circuit is also complete. It consists of a half-wave rectifier (just a diode) fed into a two-stage integrator to give different DC voltages for varying input amplitudes. The amplitude detection circuit can be seen in Figure 2. Figure 2: Amplitude Detection Schematic To verify the design, I performed a simulation with a 5 kHz sinusoidal signal with various amplitudes. Figure 3 shows the output waveform for input signals with amplitudes up to 5 Volts, stepped by 1 volt.  Figure ...