Programmable Siren Circuit Diagram with LM380

This is the simple programmable frequency adjustable rate siren circuit diagram with LM380. The LM380 operates as an astable oscillator with the frequency determined by R2/C2. Adding Ql and driving its base, with the output of a LM3900 wired as a second astable oscillator, acts to gate the output of the LM380 on and off, at a rate fixed by Rl/Cl.

Programmable Siren Circuit Diagram with LM380

Programmable Siren Circuit Diagram with LM380

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