DOUBLE TUNED AMPLIFIERS
DOUBLE TUNED AMPLIFIERS The disadvantage of POTENTIAL INSTABILITY in single tuned amplifiers can be overcome in Double tuned amplifiers. Double tuned amplifiers consists of Inductively coupled two tuned circuits. One L1, C1 and the other L2, C2. In the Collector terminals. A change in the coupling of the two tuned circuits results in change in the shape of the Frequency response curve. By proper adjustment of the coupling between the two coils of the two tuned circuits, the required results(High selectivity, high Voltage gain and required bandwidth) may be obtained. CIRCUIT DIAGRAM OF DOUBLE TUNED AMPLIFIERS CIRCUIT OPERATION OF DOUBLE TUNED AMPLIFIERS The high Frequency signal to be amplified is applied to the input terminal of the amplifier. The resonant Frequency of TUNED CIRCUIT connected in the Collector circuit is made equal to signal Frequency by varying the value of C1. Now the tuned circuit L1, C1 offers very high Impedence to input signal Frequency and therefore, large outpu...