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
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