The tune circuit composed of MOSFET and inductance coils

Published:2011/7/17 20:24:00 Author:Borg | Keyword: tune circuit, inductance coils | From:SeekIC

This is the tune circuit composed of MOSFET and inductance coils, which can only amplify the signals of certain frequency, it is fitted in the terminal circuit of low power emitters. The circuit is in push-pull pattern, so there few odd harmonic waves, its gain without connecting with attenuator is +20~+30dB at the frequency of 14MHZ. in the circuit, R1, R2 and R3 composed the input attenuator, R4, R5 and R6 form the output attenuator; VT1 and VT2 are the 2SK241 power MOSFET. If larger gain and output power are needed, one more parallel 2SK241 can meet the need. When the gain is two large and the impedance may be mismatching, an attenuator can be fixed in it.



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