![Equivalent Circuit for an SCS](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNTEiIGhlaWdodD0iMjM0IiB2aWV3Qm94PSIwIDAgMjUxIDIzNCI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
MCT (MOS-Controlled Thyristor) and SCS (Silicon Controlled Switch) are the low power devices belong to Thyristor family.
![Block Diagram of X-Ray](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1NDQiIGhlaWdodD0iMzUxIiB2aWV3Qm94PSIwIDAgNTQ0IDM1MSI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
Three types of rays emits continuously from a radium material. These rays are known as alpha rays (a rays), Beta rays (p rays) and gamma rays (x rays).
![Magneto Striation OSC](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyOTgiIGhlaWdodD0iMjQ1IiB2aWV3Qm94PSIwIDAgMjk4IDI0NSI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
The frequencies which are beyond the limit of hearing are called ultrasonic. The ultrasonic waves are of frequencies above 20000Hz (20 KHz).
![UJT Construction](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNjYiIGhlaWdodD0iMjA3IiB2aWV3Qm94PSIwIDAgMTY2IDIwNyI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
The term UJT stands for Uni Junction Transistor. This type of transistor possesses one PN junction and three terminals. Construction, working, applications
![Transistor Timer Circuit Diagram](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MzQiIGhlaWdodD0iMjQ5IiB2aWV3Qm94PSIwIDAgNDM0IDI0OSI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
In electronics timers the output of the timing element is used as a trigger pulse for BJT, FET and UJT, the active devices element signal
The transducer may be defined as any device that convert the energy from one form to another, Most of the transducers either convert electrical
![Thyristor Gate Voltage](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMzAiIGhlaWdodD0iMjkzIiB2aWV3Qm94PSIwIDAgMzMwIDI5MyI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
The thyristor in this condition may be considered as three diodes in series, with directions such as to prevent conduction in either direction.
![Firing System for Complex Systems](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MTAiIGhlaWdodD0iMjM1IiB2aWV3Qm94PSIwIDAgNDEwIDIzNSI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
For safe and certain firing the gate firing signal must be fitted in the area bounded by shaded lines, as shown in the...
![GTO Thyristor Structure](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMDIiIGhlaWdodD0iMTUzIiB2aWV3Qm94PSIwIDAgMzAyIDE1MyI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
The conventional thyristor can only be turned off by effectively reducing the anode current to zero, but the gate turn off thyristor,
![Thyristor Construction](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMTAiIGhlaWdodD0iMTcxIiB2aWV3Qm94PSIwIDAgMTEwIDE3MSI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
Thyristor was invented in 1957 at Bell Labs. They are extensively used as switches, operating from conducting
![3 Phase Motor Control Using SCR](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0ODgiIGhlaWdodD0iMzQ4IiB2aWV3Qm94PSIwIDAgNDg4IDM0OCI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
In this method the speed of squirrel cage induction motor control by varying the stator voltage, which is possible
![3 Phase Delta Star Bridge Rectifier](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1MjMiIGhlaWdodD0iMjEyIiB2aWV3Qm94PSIwIDAgNTIzIDIxMiI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
In this circuit six diodes, Q3 transformer whose primary delta winding and secondary is star winding is used.
![SCR Construction](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMzMiIGhlaWdodD0iMTQ3IiB2aWV3Qm94PSIwIDAgMTMzIDE0NyI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
The SCR stand for Silicon Controlled Rectifier, it is used in industries because it can handle high values of current and voltage.
![Seven Segment Display Physical Layout and Schematic Diagram](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0ODIiIGhlaWdodD0iMjA3IiB2aWV3Qm94PSIwIDAgNDgyIDIwNyI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
In electronic clocks calculators measuring instruments and some other scientific instruments LED are used to display the numerical digits.
![IC Temperature Transducer Symbol](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMzIiIGhlaWdodD0iMTA4IiB2aWV3Qm94PSIwIDAgMTMyIDEwOCI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=)
The self generated transducers don’t use the external power supply source. However they provide an electrical output when stimulated