ES-03           Mini Siren    (DC 9V)     150 ~ 200mA @ 9V

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This kit produces a warble siren sound when connected to a 9V battery.  No IC are used in  the circuit.   Only 5 transistors & a handful of passive components.  Transistors Q3 & Q4 are configured as a  astable flip-flop which generates a fixed tone. Transistors Q1 & Q2 form a saw-tooth wave generator which modulates the frequency of the tone generated by Q3 & Q4 thereby creating a warble siren sound.  Ideal for used as sound indicator or audible warning device 

  ( speaker & 9V battery clip included )



     PCB size : 50 x 35mm