This simple Toy Siren circuit for hobbyist and student who game liker, this is a very simple Toy Siren circuit, This Toy Siren circuit can be built small enough to frt inside a toy. The Toy Siren
circuit consists of a relaxation oscillator utilizing one uni-junction
transistor (2N2646, MU10, TIS43). R2 and C2 determine the frequency of
the tone.
Simple Toy Siren Circuit Diagram
Pushing the button, SW1 charges up the capacitor and the potential at
the junction of R2 and C2 rises, causing an upswing in the frequency of
oscillation. On releasing the push-button the charge on C2 will drop
slowly with a proportional reduction in the frequency of oscillation.
Manual operation of the button at intervals of approximately 2 seconds
will produce a siren sound.
Sourced By: Circuitsstream
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