Liquid level alarm for 4 tank

Today I made this Liquid Low level Alarm project. already I make one before to monitor a single Tank. But This will Monitor 4 liquid or water Tank. when any Tank reach Low liquid Level a sensor give signal to this device .so The warning Lamp related to that tank start blinking and an beeping Alarm sound also start. we can silence the beeper by pressing the push switch. and the indicator stay on until the liquid level normal.

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Transistor numbers and codes

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