Variable Sound UJT Siren (CB1483E)

Details
Written by: Newton C. Braga

This circuit was found in a 1977 Radio Shack documentation. The unijunction transistor can be 2N2646 and FET the BF245. The circuit is powered by a 6 to 12 volt symmetrical source. An amplification step for the speaker can be used.

 

  

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