Want to make some stuff that fits your car or motor cycle Then here is a simple musical horn circuit that can be connected to the 12V battery of any car or motorcycle. This circuit commonly used as reverse musical horn. Here we use a commercially very low cost musical IC UM66. But this Ic can only handle supply voltage below 4V. So we used a 7805
Click here to download the full size of the above Circuit.
regulator ic for adjusting the voltage to 5V and its further reduced to 3. 8 volt by connecting two diodes D1 and D2 then it will supplied to musical horn producer UM66. Whenever we supply a 12v to the musical horn circuit, it will always produce music. So we need to connect a switch between battery and circuit and when you want to move on reverse gear, the switch must be pressed to produce music. ( You can setup the circuit to automatically plays sound while reversing the car but it requires more skill to implement)
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