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|This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system.|
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|change the scr with a bjt NPN transistor|
|Why doesn't OFF when it drys?. Very simple: change The DC supply for an AC supply; the SCR turns OFF during the power supply's negative cycle . Additionally, you can change the SCR for a TRIAC.|
|If it detects rain, and when it drys it still thinks there's rain probably you could put 1N4148 instead of 1N4001 because 1N4148 is a fast recovery diode... maybe...|
|hey. Is this parts also available in south africa? Lol.. sorry but I would like to know|
|SIR, can you explain the function of each part of the circuit, especially the diode and the resistor.|
|to stop the buzzer you have to replace the SCR with a BJT in darlington pair arrangement... and also use 10k resistance as R1 connected with gate.. and the collector of transistor with the buzzer's leg. and emitter =>ground.........BJT 547 will be sufficient for that.|
|i have maid one, its perfect! i just follow the schematic and it works.|
|Is it really not switching off when the sensor is dry?|
|i built this project, but the "buzzer" still On after sensor become wet, but after the sensor is dry, the buzzer still active, Why??, I want the sensor to stop the buzzer when dry. thanx|
|How to make the circuit can differentiate between light, moderate and heavy rain? The application is to control speed motor. For example, minimum speed for light rain and maximum speed for heavy rain.|
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