AN16 Automotive and Household Siren Driver Circuits: Zsd100 and Discrete 'H'-Bridge Minimum Parts Count Solution:  Zetec Semiconductors  - Applications Notes - A solution is provided that uses a minimum number of components by utilising an application specific signal generation IC, and a high efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style switching transistors.   (Circuit / schematic design added 6/06)

Electronic Siren #1:  (Circuit / schematic design added 6/06)

Electronic Siren #3:  (Circuit / schematic design added 6/06)

One IC 2 Tones Siren Double Tone Police Sound Single Tone Old Ambulance Sound:  This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police or Fire-brigade cars, by the oscillation of IC1A and IC1B gates. (Circuit / schematic design added 6/06)

One-IC two-tones Siren:  This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police or Fire-brigade cars, by the oscillation of IC1A and IC1B gates. (Circuit added 9/04)

Powerful Siren:  Simple circuitry - No ICs - 12V Battery operation (Circuit added 9/04)