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Welcome to Amateur Radio Station NN1DX

Project Page - All Projects on the site were written by Mike Martell, N1HFX

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CW Tone Keyer

Tone Keyer  

100Khz Crystal Calibrator

Crystal Calibrator

5/4 Wave 2 Meter Antenna

2 Meter Antenna  

Discrete Component Voltage Regulator

Voltage Regulator
70cm Collinear Antenna From Coax
70cm Collinear Antenna  

12 Volt Gel Cell Charger

Gel Cell Charger
10 Amp, 13.8 Volt Power Supply
13.8 Volt Power Supply  

Audio Speech Processor

Speech Processor
PL Tone Encoder Board
Encoder Board  

Thermal Fan Controller

Fan Controller
Improved PL Tone Encoder
 

40 Meter, 5 Watt QRP Transmitter

5 Watt QRP Transmitter
Beef up Voltage Regulators
Voltage Regulator  

Transistor Audio Amplifiers

Audio Amplifiers
Home Brew A Condenser Mike
Condenser Mike  

IC Audio Amplifiers

IC Audio Amplifiers
Simple Electronic Keyer
Electronic Keyer  

Basic VOX Circuit

VOX Circuit
Easy Morse Code Keyer
Code Keyer  

Home Brew A 4 To 1 Balun

4 To 1 Balun
Easy FM Keyer
FM Keyer  

Rechargeable CMOS Battery

CMOS Battery
80 Meter, 5 Watt CW Transceiver
CW Transceiver  

Variable Bandwidth CW Filter

CW Filter
Simple Electronic S Meter
Electronic S Meter  

Adjustable Voltage Regulator

Regulator

Check Out these Circuit Design Articles:

Designing Bipolar Transistor Audio PreAmps

Preamps

Designing JFET Transistor Audio PreAmps

JFET Preamps

Designing Op Amp IC Audio PreAmps

IC Preamps

Switching Regulator Basics

Regulator Basics

Using Transistors As Switches

Transistors As Switches

 

 

 

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