User:Himansu rawat

(1).TUNED AMPLIFIER...                                                                                                                                                                                                                                                                                          amplifier wich amplify a specifc freuency or now band of frquencycies are called tuend amplifier. tuend amplifier are mostly used for the amplication of high are readio ferquency. it is because radio frequncey are genrally singl and the tuend circiut permites there selection and efficient amplification. however such amplifier are not suitable for amplification of audio frequency from 20Hz to 20KHz and not single tuend amplifier are widely used in radio and telvication circuit where thay are called upon to handle radio ferquencies. above cirecit of a simple transistor tuned amplifier. here insteted of load restor we have a paeralleer tuen circuit in collector .the impedence of this tuend circuit strongly depend upon frequency. it offer very high ipendence at restance frequency and very small impedance at all frequency. (2). analysis of parallel tuend circit....                                                                                                                                                            a paralled tuend circit conist of a capacitor and indictior  L in parller as shown in ferquency in practice some ristance R is alway present with coil if an attenating voltage is applied across this parallel circit the ferquency of ascillation will be that of the applied voltage. however ,it the ferquency of applied voltage is equal to naturale or restance frequency of LC circut then electrical restance occar under such condition the impedance of tuend circut become maxmuim and line curent is maxmuim. the curict then draws just enough energy from ac. supply nessery to over come the loss in restance ..

Himansu Electronics comm. 2012.