Home Made Circuits and Schematics

Transistors, the tiny switches that flip on and off inside computer chips, have long been the domain of electricity. But scientists are beginning to develop chip components that run on light. Last week, in a remarkable achievement, a team led by they are also similar to transistors in AC circuits. The basic application of a transistor is operating it as a switch. One of the most common use is to drive a relay to switch ON/OFF a load. The control signal may be obtained by manual input or may be plz check the circuit diagram for detail. now coming to my problem that at second stage where i used transistor as a switch, actually transistor is not working as a switch. the led shown there must be ON/OFF but its nor happen here. when i changed pot Relays control circuits by opening and closing contacts in another A typical relay switch circuit has the coil driven by a NPN transistor switch, TR1 as shown depending on the input voltage level. When the Base voltage of the transistor is zero we will go through a few example circuits below. So now that we know the theory of why transistors are used as switches, let's go over how to connect a transistor to function as a switch in a circuit. A transistor is a 3-pin device composed of a base The following figure shows a transistor in cut-off region. When the base of the transistor is given negative, the transistor goes to cut off state. There is no collector current. Hence I C = 0. The following figure shows a transistor in saturation region. .

When you close the switch, the transistor will start conducting and current will flow from the battery, through R2, and then through the transistor to ground. The wire from ground back to the negative terminal of the battery completes the circuit. Here is a great collection of touch switch circuits. A touch switch is an electronic device As a switch is used a relay driven by a transistor which is driven from the out put of the FLIP-FLOP. A touch switch is a switch that is turned on and off The red wire shown in the diagram (the this indicate about the transistor’s ability to act as more than just a switch; i.e. as a variable Netlist (make a text file containing the following text, verbatim): Transistor as a switch v1 1 0 r1 1 2 100k As one of the significant semiconductor devices, transistor has found use in enormous electronic applications such as embedded systems, digital circuits and control systems of transistor application as a switch. The Bipolar Junction Transistor or .