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Wing slash making the world smarter CIRCUIT: Components: ·          IC555-1 ·          330E-1 ·          LED-1 ·          39k-1 WORKING:                 This is the circuit which gives visual indications of the liquid level. LED glows as soon as the  water level reaches the upper level (when the water submerges the two probes). hang two loose wires in a glass. Fill the glass with water. As water touches both the wires, it completes the circuit and LED glows. In this circuit, water acts like a resistor and completes the circuit.

Wing slash making the world smarter Circuit: Components: ·          IC555-1 ·          10k pot-1 ·          1k-5 ·          330E-1 ·          100uf-1 ·          LED-2 Working:                 we are using IC555 in Astable mode. this produces a square wave. which turns ON and OFF the LED. hence by varying the resistance R1 or RV1 we can generate different frequency and duty cycle pulses. the capacitor starts charging via R1 and VR1.The LED remains ON till the capacitor reaches 2/3rd of VCC. at this point, pin 7 and pin 3 go to ground. hence the LED goes off.it takes some time for the charge to drain through RV1. the time taken to discharge is the time LED will remain OFF.  we have connected pin 6 and pin 2. when the voltage reached 1/3rd of VCC pin 2 is triggered causing LED to go high. this disconnects pin 7 from ground. and the cycle repeats. making the LED blink

Wing slash making the world smarter Circuit: Components: ·          mic-1 ·          IC555-1 ·          4027-1 ·          BC547-1 ·          10k-2 ·          100k-2 ·          10uf-1 ·          .01uf-2 ·          LED-1330E-1 WORKING:                 The MIC acts like a transducer. it converts sound into electrical signals. These signals are very low in amplitude. so we use a transistor BC547 to boost the signal hence creating a pulse sufficient to drive IC555 when someone claps. the IC555 is used in Monostable state. when a small pulse is generated when we clap, the IC555 triggers and creates a pulse of roughly 1 second. sufficient for the second stage. if C2 is not present in the kit, replace it with a wire. the output of the IC555 is fed to CD4027 which is a dual JK flip flop. when J=1 and K=1, it toggles for every clock. hence for every pulse created when we clap, the output the IC4027 toggles. hence this entire setup acts like a clap switch. for maki

Wing slash making the world smarter Circuit: Components: ·          IC555-1 ·          IN4007-1 ·          LED-1 ·          330E-1 ·          10k-1 Working: We are using the IC555 to act as a Fire alarm. Pin number 2 is the trigger of IC555, when a negative potential is applied, the IC555 triggers. you can upgrade the circuit to make the circuit turn on for a fixed duration of time when the circuit is triggered or when there is fire. the above circuit turns ON as long as there is a source of heat across the diode. the diode has polarity. and care should be taken while connecting. the cathode should be connected to Pin2 of IC555 and anode to the ground. when the diode is heated, the LED glows.