mosquito replent circuit

mosquito repelent circuit place inbetween your window a sound is generated which effect the mosquito

traffic light signal circuit easy to made

IC = NE555 ( Timer IC) , IC CD4017 (Counter IC)

Diode = IN4007  6Pcs

POT = 470K

Resistance = 22K, 100K, 220 Ohms X 3Pcs

Capacitor = 0.1 Mfd, 1 Mfd, 10 Mfd.

9 Volt Battery with Snap

Switch, Wire, Clamp, PCB

its circuit of rain alarm system try its a good thing

1.              Electronic eye has much use in this electronic age. Also Known as magic eye. It can be used as an automatic guest indicator at the door, If fitted on the bottom of the door entrance. Once it is installed at the door there is no need to install a call bell. It can also be used at homes or in banks as a burglar alarm.

The Police Siren circuit uses two 555's to produce an up-down wailing sound. The first 555 is wired as a low-frequency oscillator to control the VOLTAGE CONTROL pin 5 of the second 555. The voltage shift on pin 5 causes the frequency of the second oscillator to rise and fall.  

The 555 timer is a simple integrated circuit that can be used to make many different electronic circuits. With this information you will learn how how the 555 works and will have the experience to build some of the circuits below.

this circuit will dectect light wher you put light then it work

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