LM1830 low level detector schematic circuit design

This LM1830 low level detector schematic circuit based on the LM1830 low level detector IC require very few external components and is very easy to build .
This LM1830 low level detector can use an audio indication (speaker ) or a visual indicator (LED- light emitting diode ) that will light when the level is too low . This low level detector circuit will generate a 500 Hz audio signal when the level is low .
This low level detector require a 16 V DC power supply and the recipient must be from some metal , because you need to connect the ground of the circuit to the recipient .