Radio-frequency schematics (also see Transmitters)

  • UHF oscillator
  • Economoy short-wave radio
  • Linearized RF detector
  • Two-band radio
  • Shortwave conveter for scanners
  • FM Bug
  • AM Radio
  • Toroidal coil RF shortwave receiver
  • Crystal radio
  • CW RECEIVER 40/80 meter CW receiver
  • TRF AM Receiver circuit
  • WLW 500KW Transmitter Schematic
  • AM-Receiver for Aircraft communication (118.250MHz)
  • AM receiver for aircraft communications
  • 45-860MHz Radio receiver based on UV916-tuner
  • 80 Meter CW ARDF receiver
  • Four channel RF remote control
  • Build your own VLF Receiver
  • Receiver building blocks
  • Simple wireless radio data link
  • RX3302 receiver module schematic
  • Superregenerative 27MHz receiver
  • 49MHz walkie-talkie
  • Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
  • Vibrating pocket bug detector
  • 2MHz RF Oscillator
  • 50-150MHz Overtone Oscillator
  • Simple Op-Amp Radio
  • UHF - 100W Transistorized amplifier
  • 50MHz Converter
  • RF front-end for triple conversion GPS receiver
  • 2M - 20M transverter
  • Improved CMOS RF PLL sythesizer
  • Harmonic oscillator
  • Direction finder system
  • One transistor regenerative receiver
  • Synthesized HF receiver
  • TBA120 narrowband FM receiver
  • TDA7000 receiver
  • ZN414 receivers
  • 10W HF linear amplifier
  • 500W HF linear amplifier
  • 3W HF QRP linear amplifier
  • Phasing SSB exciter
  • 500mW HF linear amplifier
  • Generic VHF power amplifier
  • 10.7MHz FM detector
  • RTTY terminal unit
  • Q-multiplier
  • CMOS RF PLL sythesizer
  • 3W FM Transmitter
  • Crystal radio
  • Op-Amp Radio
  • Class B series modulator
  • Advanced VHF power meter
  • The MRX-40 Mini Receiver
  • External antenna for the GPS-38, Magellan 2000, or Eagle Explorer GPS receivers
  • AM Broadcast Band Active Antenna
  • Active antenna with gain
  • Ham Band VFO
  • HF Signal generator
  • Simple AM Radio Receiver & Amplifier
  • Bug detector
  • 175KHz inductive pulse receiver (PDF)
  • 200-400 MHz voltage controlled oscillator
  • AM/FM/SW active antenna
  • RF Sniffer <.5 to >500 MHz
  • Demodulator Schematic/Design
  • 73MHz remote controller hallogen light
  • CB (27MHz citizens band) receiver
  • CB (27MHz citizens band) 2.5W transmitter
  • AM to FM conveter
  • AM BCB radio receiver
  • Regenerative shortwave receiver
  • 7MHz SSB Transceiver
  • DSBSC (Double Side Band Supressed Carrier)
  • Frequency Synthesizer
  • Digital Automatic Gain Control (AGC)
  • Four Channel Wireless Transmitter and Receiver
  • PLL synthesizing oscillator (1)
  • PLL synthesizing oscillator (2)
  • PLL synthesizing oscillator (3)
  • 2N2222 40 Meter CW/DSB Transceiver
  • Yaesu FT-736R doppler compensation
  • Phased lock loop schematic
  • 30M PSK31 Transceiver
  • SOP receiver (PDF)
  • SOP direct conversion receiver
  • Receiver
  • 30m direct conversion receiver
  • Popcorn direct conversion receiver
  • 40m direct conversion receiver
  • 80m direct conversion receiver
  • Huge LED Antenna Direction Display (part 1)
  • Huge LED Antenna Direction Display (part 2)
  • 136 kHz direct conversion receiver
  • One Watt 2.45 GHz Linear Amplifier
  • 222 MHz Transverter
  • VFO from 2001 ARRL Handbook, page 17.74
  • VFO from 2001 ARRL Handbook, page 14.20
  • Assorted RF circuits
  • 14MHz SSB 10mW Transceiver
  • Building a Simple LF Exciter
  • Yaesu band decoder schematic
  • VLF radio receiver schematic
  • 5 watt, 80 meter QRP CW Transceiver
  • How to Build a 300MHz AM, RF Remote Control System
  • RF Modem Robotics Project
  • PLL FM transmitter
  • ICOM CI-V interface with RS232 RTS to PTT
  • Improved FM Stereo Modulator
  • Smooth Tone Clickless CW Sidetone Generator
  • Variety of receiver converter projects
  • One transistor FM receiver
  • 42 Mc Band to 88 Mc Band (retrofit converter) Project
  • Crystal radio circuits including diode performance comparison
  • 50MHz Assistant (Preamp & Power Amp.)
  • Bug detector
  • Basic RF oscillator
  • Radio Control Electric Switch
  • 56K RF Modem
  • 80M ARDF direction finder