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** 10 mA in C-E, beta DC less = 10 mA/173 = 58 uA
 
** 10 mA in C-E, beta DC less = 10 mA/173 = 58 uA
 
** 10x the current in the biasing resistors = 580 uA (calculated)
 
** 10x the current in the biasing resistors = 580 uA (calculated)
* R2 is 1.9V at 580 uA = 3.29KΩ use 3.3KΩ
+
* R2 is 1.9V at 580 uA = 3.29K use 3.3K
 
* R1 sources current to R2 and transistor base
 
* R1 sources current to R2 and transistor base
 
** Voltage = Vcc (12V) - 1.9V = 10.1V
 
** Voltage = Vcc (12V) - 1.9V = 10.1V
 
** Current = 577 uA + 58 uA = 635 uA
 
** Current = 577 uA + 58 uA = 635 uA
** R1 = 10.1 / .635 mA = 15.9KΩ, use 15KΩ
+
** R1 = 10.1 / .635 mA = 15.9K, use 15K
  
 
==== Measured DC operating point ====
 
==== Measured DC operating point ====
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** Expected 11 mA - close enough
 
** Expected 11 mA - close enough
 
* +BUFF = 11.84V
 
* +BUFF = 11.84V
** 0.12V which is 12 mA through R4 at 10 Ω - expected
+
** 0.12V which is 12 mA through R4 10 ohms - expected
 
* V emitter = 1.41V
 
* V emitter = 1.41V
** 1.41V/12Ω = 11.75 mA close to 12 mA total measured current
+
** 1.41V/12 Ohms = 11.75 mA close to 12 mA total measured current
 
* V on input divider = 2.06V
 
* V on input divider = 2.06V
 
** Vbase + 0.7V - close
 
** Vbase + 0.7V - close

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