Can we use NPN transistor instead of PNP?
Generally, the PNP transistor can replace NPN transistors in most electronic circuits, the only difference is the polarities of the voltages, and the directions of the current flow. PNP transistors can also be used as switching devices and an example of a PNP transistor switch is shown below.
What is difference between PNP and NPN?
As they are normally referred, PNP and NPN sensors are both supplied with positive and negative power leads, then produce a signal to indicate an “on” state. PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state.
How do you know if a transistor is NPN or PNP?
Connect the positive lead of the multimeter to the Base (B) of the transistor and connect the negative lead to the Emitter (E) of the transistor. If it is an NPN transistor then meter should show a voltage drop between 0.45V and 0.9V. If it is a PNP transistor, then it should display see “OL” (Over Limit).
How are H bridge transistors used in NPN circuits?
NPN Only Transistor H-Bridge Circuits. Here we look at construction of all NPN transistor h-bridge circuits. This is being done to learn further transistor theory and to deal with the problem of hard to find and often expensive PNP power transistors. Fig. 1 shows an example h-bridge circuit using bipolar transistors.
How to build an H bridge circuit with transistors?
The h bridge circuit we will build with 4 bipolar transistors is shown below. The breadboard circuit of the circuit above is shown below. So the first thing that should be done is setting up power for the circuit. The circuit operates off of 6-12V, so it can run any type of motor.
Where does the current go in an H bridge circuit?
This turns on the transistor at the top on the left side. Current flows from the power source, through the leftmost transistor at the top, through the DC motor, from left to right, and through the rightmost transistor and down to ground. Therefore, the circuit functions as an H-bridge.
How to make a H bridge for two motors?
To make a H-Bridge for two motors the circuit is simply duplicated as two independent circuits. In this project PWM pins 10, 11 control one motor and pins 6, 9 control the other. You have to use PWM pins.