ES-03           Electronic Siren Kit (transistors)    (DC 9V)     150 ~ 200mA @ 9V
 

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This kit produces a warble siren sound when connected to a 9V battery. 

No IC is used in  the circuit.  
Only 5 transistors & a few passive components are used. 

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 )