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

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


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


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

Li'l 7 AM Transmitter Schematic

Wireless microphone

XTAL locked tone transmitter

AM oscillator for wireless microphones

Wireless microphone

1W CW Transmitter

433MHz transmitter using SAW resonator

A 3m (100 MHz) small bug

Basic FM Transmitter

Micro Power AM Broadcast Transmitter

FM Beacon Transmitter (88-108 MHz)

1 valve CW transmitter

250mW HF CW transmitter

2 valve CW transmitter

Transmitter using LM317

5 Watt HF CW transmitter

Simple FM microphone

FM bug

High power FM bug

27MHz AM/CW transmitter

Easy 2-meter transmitter

QRP HF transmitter

Spark gap transmitter

QRP SSB transmitter

Crystal controlled FM transmitter

150mW FM transmitter

FM transmitter

Simple Low FER Transmitter

7Mhz AM/CW Amateur Radio Transmitter

VHF FM transmitter

Simple FM transmitter

Wireless microphone

Shortwave radio transmitter

175KHz inductive pulse transmitter (PDF)

7MHz QRP transmitter

Small Radio Transmitter

FM Telephone Transmitter

4 watt FM transmitter

FM transmitter bug

Small radio transmitter

AM transmitter

2 Transistor FM Voice Transmitter

15 watt FM transmitter

4 watt FM transmitter

Tiny FM transmitter using SMD (surface mount devices)

Medium range transmitter circuit

AM FM Simultaneous Transmitter Using Digital IC (CD4001)

Tracking transmitter

5W PLL Transmitter

Miniature FM transmitter

Sensitive FM transmitter

Simple RF transmitter

1.5 volt tracking transmitter

Tracking transmitter

Micro Power FM Broadcasting Circuits

Low Power FM Transmitter

RF/SS Handie Hopper Transmitter Schematic

30-Meter QRP Transmitter for Morse Code

Miniature FM Transmitter #1

Miniature FM Transmitter #2

Miniature FM Transmitter #3

Light sensing RF transmitter

Micro-Spy with FETs

Micro-Spy with USW

Micro-Spy with TTL