MW Wireless Microphone (T333E)

Details
Written by: Newton C. Braga

 

    This 1969 circuit uses two batteries, one of 1.25 and one of 45 or 90 V, thus obtaining a good range. The bobbin has 50 + 50 turns of 2 cm shaped wire 28 without core. The microphone is crystal.

 


 

 

 

 

  

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