Answer / seenu

What u said all are correct but they are using PNP Transistor

Answer / omar faruk

1. Noise are lesser added in negative voltage supply rather than positive supply.
2. To activate NPN transistor Negative Supply is mandatory.

Answer / kamrul haque

Vibration Sensor are NPN transistor so they can give negative voltage only so they are set -10 v only.its because transistor works linear in -2 to -18v so -2 to-10 8 volts same in -10 to -18 so it can measure both away and near distnce.

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