Radio-frequency schematics (also see Transmitters)

• Simple Op-Amp Radio
  
• TRF AM Receiver circuit
  
• Crystal radio
  
• Automatic message sender for CB
  
• RF Sensing relay driver
  
• Vibrating pocket bug detector
  
• 2MHz RF Oscillator
  
• 50-150MHz Overtone Oscillator
  
• Remote powered antenna pre-amplifier
  
• 10K RF probe
  
• IF amplifiers
  
• VHF 144MHz to HF 14MHz Transverter
  
• VHF harmonic oscillator (or QRP VHF FM TX) LO for transverter
  
• Modify a cheap MW radio for 1.8MHz CW/SSB
  
• Direction finding system
  
• An HF (15khZ UPWARDS) DC receiver
  
• One transistor hf regen receiver.
  
• Modify a cheap MW to cover any HF band
  
• Synthesized HF receiver
  
• TBA120 NBFM/FSK/RTTY RX for HF/VHF
  
• TDA7000 VHF WB FM RX
  
• Receivers for HF and VHF USING ZN414
  
• 10W HF Power Amplifier (linear)
  
• 500W linear HF amplifier.
  
• Step VFO
  
• A wide B/W 3 watt QRP HF linear amplifier
  
• A phasing method SSB exciter
  
• 500mW HF Linear Amplifier using 2N2222
  
• Generic VHF Power Amplifiers
  
• The Baycom packet modem
  
• Simple CW filters for homebrew QRP receivers
  
• 10.7MHz (455KHz) TTL FM demodulator
  
• G8TGL RTTY Teleprinter Terminal Unit
  
• The HamComm RTTY/CW/ASCII modem/Interface
  
• CMOS AF/RF Synthesizer (37Hz - 4MHz)
  
• HF/VHF PCB VSWR bridge
  
• HF Linear RF power amplifier
  
• 3W FM Transmitter
  
• Crystal radio
  
• Op-Amp Radio
  
• Car radio tunes the Amateur Bands
  
• Crystal set that requires no antenna
  
• 80m Direct Conversion Receiver
  
• A compact L-match ATU for portable use
  
• Morse Adaptor for your VHF/UHF FM rig
  
• An end-fed antenna, L-match coupler and resistive bridge for HF
  
• AM Broadcast Band Regenerative Receiver
  
• 50 MHz to 146 MHz Converter
  
• Hear Amateurs on your Shortwave Radio!
  
• Compact 20 14 MHz direct conversion receiver
  
• Hear Amateurs on your FM Radio!
  
• RF actuated CW monitor
  
• LF to HF Converter
  
• Super 80 ultra-simple SSB receiver for 3.5 MHz
  
• 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
  
• Bug detector
  
• 175KHz inductive pulse receiver (PDF)
  
• 200-400 MHz voltage controlled oscillator
  
• Icom CT-17 Logging & Control Interface Level Converter
  
• AM/FM/SW active antenna
  
• RF Sniffer <.5 to >500 MHz
  
• Four Channel Wireless Transmitter and Receiver
  
• Wireless event receiver
  
• Talking receiver
  
• Wireless motion detector
  
• 418MHz Control RX/TX
  
• AM receiver
  
• Field strength meter
  
• MW preamplifier
  
• Simple field strength meter
  
• 4 band double-tuned preselector
  
• ZN414 AM receiver
  
• ZN414 shortwave receiver
  
• Phased lock loop schematic
  
• Receiver
  
• Smooth Tone Clickless CW Sidetone Generator
  
• 50MHz Assistant (Preamp & Power Amp.)
  
• Bug detector
  
• Basic RF oscillator
  
• Superregenerative 27MHz receiver
  
• Radio Control Electric Switch

Look what you can get