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14 MHz SSB 10mW Transceiver - (schematic added 8/03) |
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144MHz 5W power amplifier - (electronic circuit added 05/06/07) |
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144MHz receiver with IC MC3362 Motorola - (electronic circuit added 05/06/07) |
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144MHz TX / RX control - (electronic circuit added 05/06/07) |
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144MHz VCO with FM and audio compression - (electronic circuit added 05/06/07) |
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23cm Wide-Band FM data transceiver for high-speed packet-radio - (circuit added
04/05/06) |
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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) |
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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 ir superior energy density, low self-discharge rate, and high cell voltage. When
you use one Li-ion battery to power a 3.3V dc/dc converter;.....(design idea added
6/06) |
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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. fact.....(design idea added 6/06) |
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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) |
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30M PSK31 Transceiver - (electronic Circuit / Schematic added 10/04) |
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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....(added 8/03) |
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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) |
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5 watt, 80 meter QRP CW Transceiver - (schematic added 03/04/05) |
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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) |
