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Why npn transistors are preferred in water level detector circuit?
Wiki User
∙ 10y ago
In this circuit all the transistors are working as a switch.
When the water touches the metal contact in which base of each transistor is connected, a small current flows and turns on the transistor.
When a transistor turns on, LED connected to it glows.
Thus LEDs will be turned on depending up on the level of water. By using a relay we can also control the level of water.
-suuh
Wiki User
∙ 10y ago
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Automative water level indicator using scr?
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