If you want to avoid birds from your farm then this circuit helps to scare the birds and makes them to avoid the farm.
This circuit uses 6V/300mA solar panel and Timer IC555, this circuit continuously produce sound using buzzer at the KHz range so this sound scares birds. The SLA battery charges during day time using the power out from solar panel and during night time this battery reacts as power source for the circuit.
|1.||Solar panel 6V,300mA||1|
|2.||SLA battery 6V/4Ah||1|
|8.||Resistor 68KΩ, 100Ω||each 1|