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  Electronic Tuner

Introduction to Electronic Tuning

Varicaps or Varactors are employed for electronic tuning in tuner circuits. Varactor is a unique silicon diode, the junction capacitance of which is employed for tuning. The capacitance changes in reverse with the amount of reverse bias applied beyond the diode. The tuned circuits' resonant frequency, in which they are connected, is controlled just through changing the reverse bias across the varactor:

STICK TYPE

A plastic stick is employed to adjust the variable resistor's value so as to change the voltage from 0-33 V.

THUMBWHEEL TYPE

A tuner setup that has plastic wheels can be rotated through using our thumb.

DIGITALTYPE

Micro processor is employed in this type, for adjust the voltage from 0-33 V to the varicap diode for tuning.

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