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2N2222 40 Meter CW/DSB Tranceiver - In spring of 1998, NorCal
sponsored a contest to design and build a project using no ICs and 22 or
fewer 2N2222s as the active semiconductor devices. I thought this was a
really intriguing idea, so I set about to design my version....(electronic
schematic / circuit added 4/02)
3.3V converter delivers 3W from Li-ion battery - 11/05/98 EDN-Design
Ideas....Lithium-ion batteries are rapidly gaining popularity in portable
applications because of their superior energy density, low
self-discharge….Several circuits here, scroll to find this one.... [Design
Idea by David Salerno, Unitrode Corp, Merrimack, NH]
3.3V Lithium Cell Supply Requires One Inductor - 08/05/99 EDN-Design
Ideas....Because of growing popularity of lithium-ion (Li-ion]batteries and 3.3V
power supplies, portable-equipment designers must often create a 3.3V supply that a
single Li-ion cell can power.... [Design Idea by Matt Schindler and Jay Scolio, Maxim
Integrated Products, Sunnyvale, CA]
300ma DC-to-AC Converter - This circuit was used to provide battery backup
to a device that had an AC (output) wall transformer. Due to quasi-sine-wave
output and imprecise 60Hz output frequency, some devices might not work properly. Peak
output is DC input voltage minus about 20 ohms drop. Use bigger output MOSFETS
for more current output. Designed by Andrew R. Morris (added 20/06)
49MHz Walkie Talkie - Lots of people are requesting walkie-talkie and RF
remote control schematics, so here is some. Building se circuits needs special
equipment and expertise in RF circuits. If you are going to experiment with se
circuits, please note that I did not build.... [Peter Jakab, Electrical Engineer,
Engineer of Informatics]
5 Watt 80 Meter QRP CW Transceiver - A great deal of interest has been
generated by my previous design articles, so I decided to go to work on a full blown
transceiver design. After several months of work, the ROSE-80 transceiver was born.
This transceiver is similar to other designs but contains some unique differences.
This design boasts the following features....)schematic added 8/03)
7MHz SSB Transceiver - Circuit diagram and brief description of 7MHz SSB
Transceiver for Hams. The circuit is designed around two numbers of MC1496. It can
push around 80 Watts with IRF840 in final. You can down load HTML version or
printer friendly word document. (added 6/06)
80 Meter, 5 Watt CW Transceiver - A great deal of interest has been
generated by my previous design articles, so I decided to go to work on a full blown
transceiver design. After several months of work, the ROSE-80 transceiver was born.
This transceiver is similar to other designs but contains some unique differences.
This design boasts the following features.... [Radio Amateur Society of Norwich]
