Posted on Feb 5, 2013

A low-frequency, op-amp oscillator and a VCO, both configured from a single MC3405 ~dual op amp and dual comparator, are tbe major components in a siren circuit tbat can be made to produce various warbles and wails, or serve as an audio sweep generator.

Click here to download the full size of the above Circuit.

The only otber active components needed are an MPS Al3 small-signal transistor and a 2N6030 power Darlington transistor.

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