The second meeting

figure.1 simulation of charge up circuit

figure.2 output of the current

As were shown in the pictures above, a DC power source of 16 volts is assembled in the LHS and a capacitor of 100uF is in parallel with a resistor of 1ohm. In this case, the resistor is on behalf of the magnets which we had mentioned. Once the capacitor is charging to 16 volts, it is essential of obtaining the current once the switch on the RHS is on. With respect to figure.2, it is presented the current is starting to decline after 3ms and it is due to the transient phenomena regarding the capacitor & resistor circuit.

figure.3 simulation of the photo diode

figure.4 output voltage of amplifier

As can be seen in the figure.3, two standard photo diodes are connected to a bipolar transistor individually. Specifically, the common-emitter transistor is treated as an amplifier in order to detect the voltage fluctuation concerning the output side. Two capacitors which located at the base part as well as the output side were aiming to filter the DC voltage source. As a result, the input AC signal should be amplified and detected at the output side of the transistor.