preamp

Clifton Laboratories - Band Reject Filters, Bandpass Filter, Active Antennas, amplifiers and preamplifiers

Mic Pre Ampllifier - A microphone preamplifier schematic for hand-helds by ON6MU

Low Power LF Amplifier - ON6MU Low Power amplifier

Design Guidelines for JFET Audio Preamplifier Circuits - Design Guidelines for JFET Audio Preamplifier Circuits By Mike Martell N1HFX

Wideband PreAmp's for HF/VHF/UHF - Wideband VHF/UHF/SHF monolithic PreAmp based on MARx-series by ON6MU

General purpose RF Wideband PreAmp - General purpose RF Wideband PreAmp based on BSX-20 transistor with a frequency range 14-550 MHz

Improving Receiver Noise on 50 MHz - Tests on a preamplifier for 50 MHz installed right at the feedpoint of the antenna.

144 MHz Antenna Pre-Ampilfier - Electronic circuit and components layout fot this VHF Preamp

137 kHz antenna preamplifier - A simple 137 kHz antenna preamplifier to make your FT-817 (and others) useable on 2200m band.

Amateur Radio - Microphone Preamp - Low signal, noise-high AC gain preamplifier

Homebrew UHF Preamplifiers - Amateur Radio UHF Preamplifiers HJ-FET/GasFet