Added Circuit_Simulations

Circuit_Simulations.md

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+# Analog circuit simulation: V_BAT change amplifier
+
+## Parts
+
+The circuit parts:
+- PNP Transistor T1: BC557C
+- Zener diode D1: BZX85/5.6
+- Resistor R_Z: 1 Kohms
+- Resistor R_E: 240 Ohms
+- Resistor R_C: 1 Kohms
+
+## Schematic
+
+The schematic:
+- Node V_BAT (battery voltage) connected to R_Z, R_E
+- Node GND (ground, 0 V) connected to D1 anode, R_C
+- Node V_OUT connected to R_C, T1 collector
+- T1 collector connected to V_OUT, R_C
+- T1 base connected to D1 cathode, R_Z
+- T1 emitter connected to R_E
+- R_2 connected to V_BAT, T1 base
+- D1 anode connected to GND
+- D1 cathode connected to R_Z, T1 base
+- R_E connected to T1 emitter, V_BAT
+- R_C connected to V_OUT, GND
+
+## Simulation
+
+The simulation is a DC simulation which takes the analog behavior of
+the circuit parts into account. Use the Ebers-Moll model for T1 and
+a model which accurately calculates the zener behavior of D1.
+
+Sweep V_BAT from 5.8 V to 7.8 V in 0.1 V steps.
+
+Simulate T1 base current, T1 collector current, T1 power dissipation,
+D1 current, V_OUT voltage.
+
+## Your tasks
+
+First use your ask user questions tool to fully understand the requirements
+and your tasks.
+
+Then get the models for T1 and D1.
+ 
+Afterwards create a Jupyter notebook which runs the circuit simulation and
+displays the simulated values in graphs.
+
+
+
+