Simple Melody Integrated Circuits - HK226

Key founder IC .
 With a string " bi bi ..." sound 
   output when Buzzer device
   detected a whistle sound (
   frequency between 1 KHz ~
   2 KHz ) .  
 Built in 1 LED flash output for 
   sound out indication .
 Input signal detect device and
   sound output device are using
   same buzzer .