90- URDU Water Level Switch Dribble Timer
$20.95 – $70.95
This derivative of the dribble timer uses a quad NOR gate IC chip that uses only three of the NOR gates to function. The circuit is stable until the water level has dropped enough that one of the immersed wires is no longer in the water. When the wire is no longer immersed, resistance becomes infinite, creating an open switch and triggering the NOR gate.
The parts in this kit will allow the student to complete this lab.
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