This Check this dry soil circuit For the Blind. Because it will alert on clay. Circuit has less detail. It production the low frequency pulse, the IC CMOS 4001. is primary device,internal structure consists of NOR Gate.When added to RC circuit will be on low frequency oscillator.
It is divided into two series, the first low frequency pulse generator. Then sent to another set. , A set of audio source through the C4 and then out to the speakers.You can apply the display devices as needed. Special about this circuit is to use solar cells as power supply to the circuit.Use only probes. Into the soil, we want to examine.
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