HIGH_Z_PREAMP

Published:2009/6/25 21:16:00 Author:May | From:SeekIC

Provides up to 20 megohms of input impedance and has essentially flat response from 10 Hz to 220 MHz Q3 serves as emitter resistorfor Q2、and emitter-follower Q4 reduces loading Input impedance is further increased by adding optionalcomponents shownin dashed lines， Transistors are 2N2188,SK3005,GE-9、or HEP-2．-Circuits, 73 Magazlne，Feb，1974、p102.



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