# BJT bias and switching screening
# Scope: Fixed-base-resistor DC BJT approximation at supplied beta and Vbe.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

supply = 5 V
baseResistor = 100000 ohm
collectorResistor = 1000 ohm
beta = 100
baseEmitter = 0.7 V

baseCurrent := (supply-baseEmitter)/baseResistor [A]
collectorCurrent := beta*baseCurrent [A]
collectorVoltage := supply-collectorCurrent*collectorResistor [V]

check active-region screen: collectorVoltage > 0.2 V

scenario alternative: supply = 4 V