CENTER TAPPED TRANSFORMER AUDIO OSCILLATOR

  
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The oscillator circuit uses a center-tapped transistor output transformer to serve as a load for the collector of Q1, supply a feedback signal for the base, and serve as the output winding for driving the speaker. R1 supplies dc bias and C1 completes the ac path from the transformer to Q1`s base. You can play around with the values of C1 and R1 to
CENTER TAPPED TRANSFORMER AUDIO OSCILLATOR - schematic

change the oscillator`s output level and tone, but don`t reduce R1`s value too much or the transistor will draw excessive collector current.



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