Hobby Projects - Insulation tester, LED Circuits, Meters.
Showing posts with label Amateur-Radio. Show all posts
Showing posts with label Amateur-Radio. Show all posts

Tuesday, August 08, 2017

Amateurfunkbasteln - Amateur Radio Crafts and Electronics

Amateur radio is a technical hobby. The attraction? To cover long distances with a low power radio to talk with other people, learn about their countries and cultures.

Amateurfunkbasteln - Amateur Radio Crafts and Electronics

But amateur radio also means tinker devices themselves, solder, apply electronics and learn something. In this sense, it can be a preparation for a technical career or even an engineering degree.

Use Google Translate, the pages are in German.

A Data Logger that records Slowly varying parameters, such as the temperature or decreasing the voltage of a battery. This copy records up to four measurements on parallel and saves it on a EEPROM.

Four Channel Data Logger - Amateurfunkbasteln

Four Channel Data Logger

It measures self-sufficient - without a PC - analog voltages (0-5V), it digitizes and stores the numerical value obtained in a separate memory. Later, after the measuring and recording phase, passes the data logger its information to the PC.

Thursday, March 05, 2015

RASON Projects Page - Amateur Radio

Designing Bipolar Transistor Audio PreAmps, Designing JFET Transistor Audio PreAmps, Designing Op Amp IC Audio PreAmps, Switching Regulator Basics, Using Transistors As Switches.

RASON Projects Page - Amateur Radio
  • 10 Amp, 13.8 Volt Power Supply
  • 12 Volt Gel Cell Charger
  • Thermal Fan Controller
  • Transistor Audio Amplifiers
  • 12 Volt Gel Cell Charger
  • Switching Regulator Basics
RASON Projects Page - Amateur Radio

A Potpourri of Audio Amplifiers  By N1HFX

"I intentionally avoided the use of IC amplifiers to provide a real learning experience for audio amplifier design. Although many IC amplifiers provide excellent performance at low cost, we need to learn the basics first. I will address IC audio amplifiers in a future article."

The Radio Amateur Society of Norwich
P.O. Box 329 - Norwich, Connecticut 06360

Saturday, February 02, 2008

PY2WM JK De Marco Projects

An Amateur Radio Enthusiast from Brazil. JK De Marco. In these pages Hams will find his ideas on QRP, Antennas and Complete circuits.

PY2WM JK De Marco Projects



A 40 dB RF Attenuator

"To measure power of a high power transmitter, or to be able to observe the output signal on an oscilloscope or spectrum analyzer, it is necessary that the signal is attenuated in accordance with the instrument, while it must be ensured that the transmitter is "seeing" the correct impedance. So it requires an attenuator that works with three ports (input, output, and output attenuated), all while maintaining the correct impedance of 50 ohms.

The circuit assembly and is shown here in EMRFD and also in the QST. When properly calibrated can be used for precision measurements in section 0-500 MHz, or a a calibration capacitor C1, can be used for the range of 0-50 MHz with reliability."

Other Projects and Ideas
  • Simple Homebrew Coil Winding Machine
  • Qrp-Br Spectrometer
  • Simple ESR meter
  • Swr Power Measuring mW To KW
  • 5 Volts Reference Voltage Calibrator

Friday, January 04, 2008

Lars Petersen OZ1BXM QRP Denmark

Amateur radio homepage by Lars Petersen of Holstebro, Denmark. The Useful Articles include some good rules for the QRPer and Main HF rig and antenna.

Lars Petersen OZ1BXM QRP Denmark
 
CW, QRP, and satellites. Satellite radios and PIC experiments like the one below. The K3 testboard for 16F873

Lars Petersen OZ1BXM QRP Denmark

The main components are: A 7805 bolted to a small heatsink, a blue reset button, a red LED, a serial I2C EEPROM (24LC256), four DIL switches, the 16F873 with 4 MHz crystal oscillator, a real time clock (DS1302) with lithium battery backup and a MAX232 for serial communication. I'm using an external power supply which is able to provide 12V DC at 300 mA.
 
Ham radio blog by OZ1BXM
 
SSPA for 2 meters - 1 kW module - The core of the SSPA is the 1 kW amplifier module. The module is built around the LDMOS transistor MRFE6VP61K25H from Freescale. This device can operate between 1.8 MHz and 600 MHz and delivers 1250 W output. In this application, the output is limited to 1000W.

Thursday, January 03, 2008

QRP Homebuilder Short Wave Radio

Amateur and Short Wave Radio Electronics Experimenter's Web Site

QRP Homebuilder VE7BPO - Radio Design

"The QRP/SWL Homebuilder site is owned and maintained by VE7BPO. The purpose of this website is to promote experimentation with relatively simple radio electronic circuits. Please keep in mind that I am a novice, lay person experimenter, not an engineer. "

  • Popcorn DC Receiver Mainframe
  • 40 M popcorn Superhet Receiver
  • Crystal Oscillator Frequency Offsets
  • Broadband Transformer Topics
  • Powdered Iron Torroidal Coating
  • Astable Multivibrator Circuits
  • W7ZOI JFET Biasing Tutorial

VE7BPO - Amateur Radio and Electronics

LEDs Page

How to Learn Hobby Electronics

VE7BPO has a way of presenting easy steps towards your Hobby Lab. It is Ham or Amateur Radio DIY Community that caused the outbreak of Electronic Hobbyist Activity the world over, long ago.

Here the Two Transistor Astable Multivibrator for flashing LEDs, that got popular after low priced Plastic Silicon Transistors became available, Superseding Metal Germanium ones.

More LED Flashers

Tuesday, November 13, 2007

Radioing - RF calculators and Virtual Museum

Radioing - RF calculators and Virtual Museum

eHamRadio

  • Library - exams, code, operating aids, DX
  • Ham Tools - RF calculators, conversions
  • Virtual HamShack, callsigns, links, photos

eEngineer

  • Electrical Engineering Topics
  • Electromagnetics, Glossary
  • Interference, RFI

Ham Radio Virtual Museum

  • A Virtual Museum of Ham Radios
  • Transmitters, Receivers, Transceivers
  • Photos & Specifications of the Classics


Thursday, November 01, 2007

VK5JST Amateur Radio Ideas with Photos

The new Ham Project Pages are VHF/HF Aerial Analyser, A 600MHz Frequency Counter.  Then there is a an ESR Meter for Electrolytic Capacitors.

VK5JST Amateur Radio Ideas with Photos

With a two tone tester, a dummy load and an oscilloscope, a transmitter can be really put through its paces. Two tone testing consists of applying two clean non-harmonically related sine waves of approximately equal amplitude to the audio input of an SSB transmitter.

 A Simple Two Tone Oscillator

The sine waves are typically around 600 - 700Hz and 1800 - 2000Hz i.e. about 300Hz from either end of the audio pass band.

A Simple Two Tone Oscillator

This project was published in the September 2004 issue of the Australian magazine "Amateur Radio".

Other Readworthy Pages
  • Easy PCB's Made With Kitchen Appliances
  • How to Make a Q Meter
  • Making a High Current 13.8 VOLT Supply For SSB Transceivers
  • VK5MM's excellent amateur radio homepage
  • Transformer Construction Details
  • Shortform Method of Designing Power Transformers 
The photos at VK5JST Homepage are very educative and express the idea better than words. - delabs

Tuesday, July 03, 2007

TK5EP – Antennas and Measuring Devices

TK5EP - Antennas and Measuring Devices

TS850's heaven Almost everyhting you wanted to know about the TS850. Schematics, mods, repair informations, and much more.

A remote interface compatible with the original IF232 with opto-electronic isolation is also described.

Gain chart - Made with help of F5BU's software GALVA, this small chart will help you to calculate SWR, gain, loss, RL return loss within a few seconds.

Tuesday, June 05, 2007

QRP and homebrew by DL2YEO

"My name is Udo and I am living in the small village called Spenge, about 15 km north of Bielefeld. The DARC radio club is 'OV Widukind - N59' and the locator is JO42FD. I spend a part of my freetime with designing circuits and home-brewing electronic devices..."

QRP and homebrew by DL2YEO 
  • Front Panel Design
  • Some useful Tables
  • 13.8 V / 15 A from a PC
  • 250 W S.M.P.S.
  • Analogue Frequency Display
  • Oscillators
QRP and homebrew by DL2YEO

"The electronics industry uses several methods for labelling front panels and enclosures, including screen printing, press forming, erosion, lasers etc.. The common factor of these techniques is that they are generally beyond the home constructor. Having these parts specially made commercially can be very expensive, and the only alternative is standardized scales and fonts."

Sunday, April 01, 2007

FCs Electronic Circuits

FCs Electronic Circuits

Solar Power Circuits charge control, LED lights, Amateur Radio Circuits, beacon keyer, smooth sidetone, antenna tuner. Micro Power FM Broadcasting Circuits FM stereo, J-Pole, Pulse Width Modulator PWM Circuits, motor speed controls, Geiger Counter Circuits, numerical counter. Video Circuits, camera motor, miniature camera-TV.