First IF Amplifier

MOSFET Amplifier with S-Meter

The first IF amplifier includes a inexpensive 455kHz IF filter (6kHz wide), and the optoisolator for the S Meter Circuit. The 455kHz IF filter can be left out if you can't find one. I have also taken off the 2.2K matching impedance resistor at the 455kHz filter and found no difference in performance.

4N35 Schematic

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Last Update: 01/22/2000
Web Author: David White, WN5Y