XOR gate using tranistors

the circuit below is the transistor xor gate and the led will glow only A and B inputs are opposite to each other. this is very important circuit used in making adder circuit and other very important device. this circuit is successively simulated in proteus simulator and is tested successfully. please check it out to improve your practical knowledge in logic circuit.

monostable mode of NE555 chip

This is a basic and important circuit and working principle of popular ciruit NE555. this circuit can be operated with various sensors instead of switch. the circuit can be assembled as shown below and can be simulated using proteus simulator.

working of a circuit when the switch is closed then the lower led will glow and hold for some time until the charge of capacitor finished. after then the lower led will be off and the upper led will glow. again when we press the switch than the same process repeats. if you have any confusion, please ask me...................

bidirectional transistor motor driver for robotic project/ H bridge motor driver

this is the very useful motor driver circuit and its easy to make. this circuit is used in robotic project to move the robotic wheel front back right and left. this circuit is composed of two npn and two pnp transistors and some resistor. you need to have two switch to change the direction of the motor. here the transistors are acting on the its switching application. when both switches are off then motor donot move. when one of the switch is on then the npn of the one and the pnp of another side will be on so current flow through motor. so motor is on. when upper pnp is on on the left side, its lower npn is of and right side lower npn will be on but right side upper pnp will be off when switch is pressed at right side. note switch on means logic 0 and switch off means logic 1 if you are facing problems you can comment here. for the full description i ll upload the working video on youtube.com. check my channel sangit.niroula. this circuit is simulated in proteus simulator.

automatic street light using two transistor

automatic street is a very interesting circuit and using it we can make the light lamp on at night time and off at day time. this circuit is very simple to understand and make. components required -> two bc547 transistors --> resistors of value 2.2kohm and 330ohm both two --> light dependent resistors ->>>light emitting diode -->> 9v battery circuit diagram in night time, the value of light dependent resistor is very high and it makes the first transistor off so the second transistor will get base current and and it will be on so the led glows at this time. in day time, the resistance value of light dependent resistor is very low so it makes the first transistor on and the current flows through the first transistor therefore the second transistor will not get the base current so it will be off.. therefore at day time light will be off. still you have any confusion making this circuit on breadboard and matrix board, you can comment here/.......... thanks

astable multivibrator circuit using two transistors (led flasher)

INTRODUCTION Astable multivibrator circuit is a circuit whose output level is not stable. the output of the circuit is high and low alternately. the circuit below is very interesting and there are two leds which glows turn by turn. ie they blick turn by turn. CIRCUIT DIAGRAM WORKING OF THE CIRCUIT the above circuit work based on two properties of the two components. 1. capacitor stores charges when DC is applied across it.when charging a capacitor, direct current flows through capacitor.when capacitor is charged two third, then current stops flowing. when its discharged upto one third then current again flows through it. 2. when current is supplied to the base region of the transistor, then current starts to flow from collector to emitter of the transistor because transistor is current controlled device. This condition of the transistor is called saturation. again when base current is not supplied to the transistor, then current doesnot flow through collector to emitter of the transistor which is called cut off .. lets look at the following diagram when capacitor 1 is charging note that led2 is glowing since transistor 1 gets base current when capacitor 1 is charging being transistor 1 on... when capacitor 2 is charging still if you have any confusion about making this circuit, you can comment here... thanks for your visit in this blog.

circuitsnepal: running light and decade counter

circuitsnepal: running light and decade counter

circuitsnepal: running light and decade counter

circuitsnepal: running light and decade counter