Sunday, April 03, 2016
Alan Yates Laboratory - vk2zay
Reflection-pair optical tachometer - The circuit is simplicity itself. There is a red LED to illuminate the target and a photo diode in photo-conductive mode to pick up the reflected light.
One Transistor Voice Transceiver - Building a toy VHF phone transceiver for 3 metres using only one transistor for both TX and RX!
MK484 MW Receiver - A fairly small MK484 based receiver for the AM broadcast band.
40 Metre Spectrum Analyzer - My go at making a JF1OZL-style spectrum analyser for 40 metres.
Nano-Henry Inductance Meter - My implementation of Drew Diamond VK3XU's "Nano-L", plus how I constructed and trimmed my calibration inductances.
Engineering Calculators - Useful online calculators for the Hobby Enthusiast. Ham Radio People and also students and Engineers,
Thursday, February 04, 2016
"The full size plans will allow you to make an exact replica of the key and sounder. The photo above is the "real thing" antique originals. The originals were made in a time when quality was of prime importance and esthetics ran a close second! These instruments were made of brass and steel,"
Western Electric Telegraph Key & Sounder
--. .-. . . - .. -. --. ... / ..-. .-. --- -- / -.. . .-.. .- -... ...
Use Morse Code Translator to Unravel the Telegraphic Morse Message above.
Thursday, May 22, 2008
Bill Jones, K8CU, has been an active Radio Amateur, CW Dxer, and home project builder since first receiving his Amateur Radio license in 1966 at age 17. Bill is an electronics professional with four-decades of experience.
High voltage regulated power supply for RF amplifiers. This is an enhancement of the article by VE6AXW in July/Aug 1999 QEX. I have redrawn the schematic for clarity, added EMI filtering, included a programmable power on timer, and generated a printed circuit board layout. Works for most voltage values.
Saturday, September 29, 2007
Saturday, September 01, 2007
A long, long time ago a bright ape figured out that by climbing down from the trees he could more easily master his life, and that of others......Homo sapiens wanted something else, and better. He started to play. Homo ludens was born!
- Homo ludens radiactivus - amateur radio
- Homo ludens radiohistoricus my antique radio collection
- Homo ludens electronicus - electronic projects
- Homo ludens aeromodellisticus - model airplanes
Transformers and coils: This is not a building project, but a short and concise lesson in how to design electromagnetic parts. It's much simpler than what you may expect!
Thermal design: A short course in keeping electronic parts adequately cool.
"This transceiver was conceived as a power-efficient, small, lighweight unit to be carried in the backpack, along with antenna and battery, for use during trekking and mountaineering trips. It had to be reasonably rugged and reliable, and perform well. Furthermore, I wanted it to solve all the problems the old DSB transceivers had, such as frequency instability, distorted modulation, lack of sensitivity and selectivity, and others."