Stethoscope CIR21016S (CB22490E)

Details
Written by: Newton C. Braga

 

With the name of detectaphone, we find this circuit in a documentation from 1966. It will be convenient to couple the input audio signal through a 100 nF capacitor. The transistors are 2N107 and 2N170.

 


 

 

 

 

  

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