DIY Electronic Horn for a Bicycle or Car

Details

The LM555 generates an electronic horn signal which is amplified by an LM386. The tone and gain of the horn can be easily varied. The horn can be used in a car, scooter, cycle, and motorbike.

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Build Instructions

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Parts & Tools
Electronic Components:
- 1x IC 555 AliExpress
- 1x IC LM386 AliExpress
- 2x IC Holder AliExpress
- 1x 10Ω Resistor AliExpress
- 1x 1KΩ Resistor AliExpress
- 1x 2KΩ Resistor AliExpress
- 3x 10KΩ Potentiometer AliExpress
- 1x Tactile Momentary Push Buttons AliExpress
- 1x 5mm LED AliExpress
- 1x 0.1uF Capacitor AliExpress
- 1x 10uF Capacitor AliExpress
- 1x 100uF Capacitor AliExpress
- 1x 220uF Capacitor AliExpress
- 1x 10nF Capacitor AliExpress
- 1x 47nF Capacitor AliExpress
- 1x 100nF Capacitor AliExpress
- 1x Speaker AliExpress
- 1x 9V Battery Holder AliExpress
- 1x 9V Battery AliExpress
- 1x PCB AliExpress
Tools:
- Soldering Iron AliExpress
- Soldering Wire AliExpress
- Mini PCB Hand Drill + Bits AliExpress
You can also Buy the PCB
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LM555 Explained

The 555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. For stable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200mA or drive TTL circuits.
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LM386 Explained

The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.

The inputs are ground referenced while the output automatically biases to one-half the supply voltage.