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Showing posts with label Transistor Circuit. Show all posts
Showing posts with label Transistor Circuit. Show all posts

Water Sensor Circuit Diagram using IC 555

This is a water sensor /rain alarm circuit diagram; it can be used on motorcycle, car or other device that we want to protect from water, rain.
This is a simple water sensor/rain alarm circuit that makes an alarm when water/rain falls on its sensor. This circuit is based on NE555/LM555 IC and two transistors (Q1&Q2). For  transistor Q1- BC547 or BC107 and for Q2-  2N825,BC548 or BC168 can be used in the circuit. This rain detector circuit can be supplied from voltage source of +9V-12V DC. The resistor 470K ohm is a POT/Variable resistor; it is used to adjust the sensitivity of water/rain sensor. Use a 8 ohm,0.5w-1W  speaker to hearing  better alarm. Less than 8 ohm speaker could be harmful for the IC 555.

Circuit Diagram of Water Sensor

Fig-1: Water Sensor/Rain alarm circuit diagram

Dark detector circuit using LDR, LED

This is a basic dark detector/sensor circuit diagram based on a Photo Resistor (LDR) and  few numbers of parts.

Parts list of dark detector:

R1 = 330Ω Resistor
R2 = 1KΩ Resistor
R3 = 1k Variable Resistor
Q1, Q2 = BC547 Transistor
One Photo Resistor (LDR)
One 6V DC power supply or Battery

Circuit diagram of dark detector/sensor:

dark detector circuit diagram
Fig: Circuit diagram of dark detector/sensor

Astable multivibrator-2 LED flashing circuit,2N3904,3.7V

Many of my friends asked me for automatic on off led circuit or  led flashing circuit so here I’m going to post a Astable multivibrator-2 LED flashing circuit.

Circuit diagram of Astable multivibrator with 2 LED:


Fig:  Astable multivibrator-2 LED flashing circuit Circuit diagram
It is a simple astable multivibrator circuit using 2LED (here i used red LED), two NPN small transistor 2N3904 for switching. Here other small NPN transistor can be used, including  2N4401, 2N2222 or PN2222. Supply voltage is +3.7V to +5V or if you want to supply a larger volt then add a required resistor series connected with  2 LED’s. I recommend to use +3.7V for best result . for +3.7V you can use a battery of  mobile phone.
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