Homebrew RF Circuit Design Ideas

Transceivers

• 5W 80m CW Transceiver

• 7MHz QRP Transceiver - DL5NEG

• 27MHz R/C Transceiver

• 49MHz Walkie-Talkie

• 432MHz Data Transceiver

• QRP SSB Transceiver

• QRP Transceiver 40m/20m - IK3OIL

• Short Range Wireless Data Communication

• Transceiver QRP 20m SSB

• HF Transceiver CW SSB NorCalSierra

• Transceiver QRP 40m - F6BQU

• Transceiver SSB with 9MHz-IF

• 20m Transceiver BITX - VU2ESE

• 40m - 20m Dual-band Transceiver - VU2ESE

• 10GHz I/Q Transceiver - S53MV

• 7MHz Transceiver - DK6SX

• MIZUHO MX21S QRP Transceiver

• HF SSB QRP Transceiver - YD1JJJ

• 40m CW QRP Transceiver - NT7S

• Long Range FM Cordless Telephone

• 3.5MHz 5W CW Transceiver - JF1OZL

• 14MHz 10W SSB Transceiver - JF1OZL

• 21MHz QRP SSB Transceiver - JF1OZL

• 40m SSB Transceiver Santerre - F6FEO

• 10MHz 1W Transceiver NE-QRP

• 20m CW Transceiver - 7N3WVM

• 20m QRP Transceiver - PA2OHH

Receivers

• 3.5MHz to 10MHz Superheterodine Receiver

• 7MHz Direct Conversion Receiver

• 20m Direct Conversion Receiver

• 27MHz R/C Receiver

• 80m/40m Direct Conversion Receiver

• 80m Superheterodine Receiver

• Aircraft Receiver 118MHz to 136MHz

• AM Superheterodine Receiver with NE612

• Shortwave AM Receiver

• 2 Bands Shortwave AM Receiver

• HF Receiver SSB Superheterodine

• Receiver HF SSB CW Superheterodine

• 144MHz SSB Receiver - W1VT

• Two-stages HF Regenerative Receiver

• 80m/40m IQ Receiver - AK4AA

• 40m Direct Conversion Receiver - VU2ESE

• 1.8MHz to 14.5MHz Direct Conversion Receiver

• 432MHz FM Receiver - DF2FQ

• HF Receiver - WN5Y

• 144MHz FM Receiver

• FM Receiver for Airband 137MHz

• 14.070MHz PSK31 Receiver - DL6FAP

• 20m PSK31 Receiver - DG2SK

• Ten-Tec 1253 Shortwave Receiver

• Direct Conversion Receiver with MOSFETs

• HF Direct Conversion Receiver - VU2UPX

• HF Receiver with MC3362 - VU2UPX

• FM ATV Receiver

• 40m Binaural I/Q Receiver - KK7B

• Two Regenerative Receivers

Transmitters

• 10W 40m CW Transmitter

• 2m Band Beacon

• Beacon for 144MHz

• Beacon for VHF

• HF QRP CW Transmitter

• VHF Beacon

• Wireless AM Microphone

• X-tal VHF FM Transmitter

• Active Frequency Quadrupler

• 432MHz to 1296MHz Frequency Tripler

• 7MHz CW QRP Transmitter

• 14MHz CW QRP Transmitter

• 145MHz X-tal FM Transmitter

• 27MHz AM/FM Transmitter

• HF QRP CW Transmitter VXO - W7ZOI

• FM Audio Transmitter with Monitor

Transverters

• 1.3GHz Transverter - DB9LN / DB6NT

• 2.3GHz to 144MHz Transverter - DB6NT

• 5.7GHz Transverter - DB6NT

• 10GHz to 144MHz Transverter - DB6NT

• 50MHz Transverter - OE9PMJ

• 144MHz to 28MHz RX Converter MOS

• 144MHz to 28MHz RX Converter FET

• VHF to 1.3GHz up-converter

• 1296MHz to144MHz Transverter - F5LGJ

• 10GHz Transverter

• 70MHz to 28MHz Transverter - OZ2M

• No-Tune Transverter 1.3GHz to 144MHz - KK7B

• No-Tune Transverter 2304MHz to 144MHz - W8NLC

• Javornik 144MHz to 14MHz Transverter - S53WW

• 50MHz junk-box converter - WA3ENK

• 50MHz to 28MHz Transverter - DK7ZB

• 50MHz to 28MHz simple Converter

• 144MHz to 28MHz Transverter

• Very Low Frequency Converter 0-250kHz to 3.5MHz

• UHF to VHF TV Converter

• 144MHz to 28MHz Receive Converter - N0GZ

• 1296MHz Transverter - W1GHZ

Audio/Video TV Transmitters/Modulators

• Audio/Video Transmitter

• AM TV Transmitter

• 23cm ATV FM Transmitter

• A-V UHF TV Modulator

• Crystal TV Video Modulator

• TV Audio-Video Transmitter

• Simple TV Video Modulator

• TV Modulator

• A-V Transmitter - ZP5ZDM

• A-V VHF Transmitter

RF Test Circuits

• Capacitance Meter

• Field Strength Meter LM324

• HF Q-meter VK5JST

• Antenna Analyzer - F6BQU

• RF Power Calibrator

• VHF Wattmeter

• 88MHz - 960MHz Antenna Analyzer

• LED RF Power Meter

• Return Loss Bridge

• Return Loss Bridge with AD8307

• HF SWR Bridge

• Grid Dip Meter 2MHz-20MHz

• Field Strength Meter 3 Levels

RF Power Amplifiers

• 10W HF Power Amplifier

• 50MHz 100W Power Amplifier

• 50MHz 350W Power Amplifier 2xBLX15

• 80W 3MHz to 30MHz Power Amplifier

• 125W 144MHz Power Amplifier

• 60W HF Power Amplifier IRF840

• 10W to 200W Class E/F HF Power Amplifier

• 20W Linear Power Amplifier for 14MHz

• 144MHz 100W Power Amplifier

• 144MHz 180W Power Amplifier

• 432MHz 50W Power Amplifier

• 432MHz 110W Power Amplifier

• 144MHz 75W PA with RX preamplifier

• 144MHz 110W Linear PA

• 28MHz 150W Power Amplifier

• 144MHz 200W PA with RX preamplifier

• HF PA's with MOSFETs - DK7ZB

• 50MHz 35W PA with MOSFET - DJ9FG

• 40W HF PA with MOSFET - WA2EBY

• 40W 88-108MHz FM Power Amplifier

• 144MHz 100W Push-Pull PA - YU1AW

• UHF 25W Power Amplifier

• VHF 30W Power Amplifier

High Frequency Low Noise Amplifiers

• LNA for 2.4GHz 30dB-Gain 0.6dB-NF

• 10GHz Low Noise Amplifier

• 144MHz GaAs LNA

• 144MHz LNA - YU1AW

• 432MHz LNA MGF1402

• 432MHz LNA - YU1AW

• 950MHz to 2150MHz LNA

• 1296MHz Low Noise Amplifier

• Antenna Preamplifier 100kHz to 220MHz

• UHF TV Preamplifier 25dB Gain

• LNA for UHF Band BFP540

• High IP3 HF LNA

• L-band Low Noise Amplifier

• 950MHz - 2150MHz LNB

• HF Preselector - DL2JDN

Oscillators

• 5MHz to 5.4MHz Variable Frequency Oscillator

• 6MHz to 6.35MHz Variable Frequency Oscillator

• 7MHz to 7.3MHz Variable Frequency Oscillator

• 30MHz to 200MHz VCO

• 50MHz to 150MHz Crystal Oscillator

• 50MHz Crystal Oscillator

• 100MHz Crystal Oscillator

• 100MHz VCXO

• 455kHz Ceramic Filter BFO

• Butler Crystal Oscillator

• Vackar VFO G3PDM

• High Power VFO - K7HFD

• Low Voltage Crystal Oscillator

• Parallel Mode Crystal Oscillator

• Series Mode Crystal Oscillator

• Variable Crystal Oscillator VXO

• 750MHz Push-Push Oscillator

• Butler Overtone Crystal Oscillator

• High Overtone Crystal Oscillator

• 3MHz to 30MHz VCXO

• Low Noise Differential VFO - 5MHz to 5.5MHz

• 2.4GHz Signal Source - W6PQL

• 900MHz Signal Source - W6PQL

• 1104MHz Local Oscillator - W6PQL

• 1296MHz Local Oscillator - W6PQL

• VHF Oven Crystal Oscillator - W6PQL

• 1.3GHz VCO with Emitter Noise Feedback

• 2GHz to 4GHz VCO

• 220MHz Low Noise Cascode Oscillator

• 600MHz to 2.2GHz VCO

• 800MHz to 2.2GHz Push-Pull VCO

• 1GHz Differential VCO with Amplitude Control

• 10MHz VXO

• 116MHz High Level X-tal LO

RF Mixers

• Doubly Balanced Mixer MC1496

• Mixer Diplexer

• Dual MOSFET Mixer

• Microwave Mixers

• Stripline Quadrature Microwave Mixers

RF Switch

• IF Filters Switching Circuit

• TX/RX RF Switch FET

• TX/RX RF Switch PIN

• RF Sensing TX/RX Switch

Audio

• Active CW Filter and Audio Amplifier

• Dynamic Noise Filter

• Microphone Preamplifier Electret

• Microphone Speech Processor

• Microphone Amplifier Low/High Impedance

• Class-A Headphone Amplifier

• Class-A Audio Amplifier

• Speech Processor

• Variable CW Bandpass Filter

• Variable CW Filter and Amplifier

• Audio Automatic Gain Control

• Baxandall Audio Filter

• Microphone Amplifier with ALC

• Audio Amplifier with mute control

Power Supply

• DC Protection Circuits

• Overvoltage Protection

• Power Supply 13.8V/20A

Miscellaneous Circuits

• Microwave Motion Detector

• Satellite Finder

• Electrostatic Detector

• HF Line Coupler

• 4:1 Broadband Transformers

• Noise Blanker

• PIN Attenuator BAR61

• UHF Movement Detector

• VOX Circuit

• Balun Transformers

• Helical Resonator Dimensions

• Crystal Filters Types

• Receiver AGC with hang threshold

• Variable PIN Attenuator 1dB to 20dB

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