This sound generator circuit combines transistor tone generation and the function of the industry standard LM555 general purpose timing chip to increase the "white noise" component present in train whistles. The FK235 is supplied with an 8 Ohm 0.25W speaker and offers a realistic train-whistle sound, making it an ideal sound unit for model train sets.

Technical Specification

  • Power Supply : 9VDC @ 55mA max.
  • Unit Dimensions : 1.98" x 1.05" x 0.6" (plus speaker : 50mm x 26mm x 15mm)

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