In electronic clocks calculators measuring instruments and some other scientific instruments LED are used to display the numerical digits. Read more about Seven Segment Display
Passive Transducers required an external power supply and therefore output is equal to the variation in a physical parameter such as pressure, temp etc Read more about Passive Transducers
In this method the speed of squirrel gauge induction motor control by varying the stator voltage, which is possible with the help of three sets of SCR’s connected back to back(parallel but opposite in direction ) with each phase of input supply as shown in figure below. Read more about Three Phase motor control using SCR
The diagram of magnetic amp or magnetic amplifier is shown in figure below, only silicon diodes are added in series with each winding of the saturate reactor.
LVDT consist of one primary winding and two secondary windings, which are placed at either side of the primary winding on the same magnetic core as shown in figure
As shown in the below diagram, the direct coupled amplifier (DC) is consist of two transistors Q1 and Q2 , a voltage divider base bias resistor network (R1, R2) which is provided on the transistor Q1 base two collector resistors Rc1and Rc2, Read more about Direct Coupled Amplifier
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