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A direct conversion receiver. I have sucessfully made it for 3.5MHz, 7MHz, 10MHz and 14Mhz. I cannot give you any schematic though, since i built it completely by head, not documenting as I worked. Not very smart. It uses a NE612 mixer, with an VFO on the receiving frequency. The receiver is quite sensitive, and due to the balanced output to a LM386 audio amp, it does not suffer very much from intermod.
My MP3 Player as it stands today. It is based on a PIC17C756, 512Kb SRAM, a 3,2 Gb hard disk, 256*64 pixel Graphic LCD, MAS3507D decoder Chip, CS4334 D/A, a PIC16F877 to control a numeric keypad, and an old computer case. It works big time, and was my portable monster music box, back in 1998 when portable HD based mp3 players didn't exist.
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This is a Memorykeyer and audio break-out box. I can with the knobs on the front select to key radio 1-4, select 2 of 10 different audio-sources to come out on the two built in speakers, or headphones. This way I can run all my radios more or less simultaneously The LCD has backlight of course. The CWThing is built up around a PIC16F877, a IRF530 Switching FET, a load of knobs and connectors, a couple of speakers, a standard ASCII LCD and a 64KBit EEPROM.
On the backside you can see all the connectors. From the left, one line out connector, 5 stereo in connectors, below there are 5 mono in connectors. Then there is the key in connector and four key out connectors. And last but not least the RS232 computer-port, which I use to add/remove/edit the stored messages and a bunch of other things...
Several scrapped projects lying around for a rainy day. There is a flash burner, another receiver project, a morse keyer, a "computer game", a internet ready eeprom burner and temperature sensor(!) with ethernet connection, amongst other things. I mostly use Microchip PIC in my projects.
This is a picture of a magnetometer i hopefully some day will get online. It's quite old, and not exactly in mint condition. The only thing that works as of today, is the X-axis. I have no schematic, and no info on how it works. Hopefully I'll figure it out some day. If anybody has any info, please send me an email. I think it might be a Flinders type.
Last changed: 28 02 2005 - 12:47