Hi$,$ I need help with Implementing a $555-$based transmitter and verifying its ability to change its frequency in the presence of a magnet. I also need to implement the TIA and verify its ability to produce a measurable output voltage from the small$-$value

current derived from the PD$.$ In order to do that I need help knowing what the schematic is going to look like as I need to build it in LTSpice. I also need to figure out the specific parts I$\text{'}$m going to use alongside finding the nominal values of each specific component to give me the desired outcome. Thank You!