Audio Circuit Diagrams

Musical Horn for ATBs Schematic Circuit Diagram

Craft Your Unique Musical Bike Horn

For enthusiasts skilled in all-terrain biking and soldering, here’s an exciting project: a musical horn that not only produces a more pleasant sound compared to a standard bell but also elicits surprised smiles from passersby. The unique notes emanating from your all-terrain bike or mountain bike are bound to capture attention and spread smiles.

Musical Horn for ATBs Schematic Circuit Diagram

Repurposing the SAE800 Integrated Circuit

In this project, we repurpose the SAE800 integrated circuit, originally designed for doorbells or musical chimes in houses. With minimal external components, it can operate on voltages ranging from 2.8 to 18 V, ensuring functionality even with a significantly depleted battery, albeit at a reduced sound volume. The sound volume, which can be adjusted using potentiometer P1, is relatively high and essential for the horn’s effectiveness. Switch S1, however, is crucial only if maximizing battery life is a priority. When the circuit is inactive, entering standby mode upon push-button S2 not being pressed, it consumes an incredibly low current of about 1 µA.

Creating Varied Musical Tones

IC1, the core component, produces three distinct sounds based on the activation of E1, E2, or both. Diodes D1 and D2 are employed to achieve our desired configuration, generating an appealing sound composed of three notes at 440 Hz, 550 Hz, and 660 Hz. These notes overlap and diminish in amplitude over approximately 7 seconds. Alternatively, you can opt for a different sound profile by selecting only D1 or D2 and leaving the unused input unconnected.

Weatherproofing Considerations

While the project doesn’t pose significant technical challenges, it requires encasing it in a waterproof plastic container to shield it from rain. Additionally, choosing a loudspeaker with a Mylar (plastic) cone rather than a traditional fiber cone is advisable due to the latter’s susceptibility to humidity. If using switch S1 and push-button S2, it’s prudent to select types with small rubber ‘boots,’ enhancing resistance to moisture.

Caution. The installation and use of this circuit may be subject to legal restrictions in your country, state, or area.


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