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A Serial Infrared Remote Controller - This is a simple, cheap device
that can be connected to any serial port to control most components that have
infrared remote controls. I designed and built it (on a solderless breadboard)
in 1991. In 1992 I wrote a lengthy description of it for an electronics class.
In 1994 I finally designed a PC board for it, using a free, X-based PC board
design program called pcb, and in 1995 I....(circuit added 08/09)
A Versatile Hybrid Synthesizer for UHF & Microwave Projects -
Controlled by PC parallel port, this hybrid DDS/PLL synsizer delivers
full-octave coverage between 1000 and 2000 MHz with sub-1 Hz resolution and
commercial-quality phase-noise performance. (added 10/05)
A worked Stepping Motor Example - Perhaps some of the most commonly
available stepping motors, for the experimenter, are the head positioning motors
from old diskette drives. These can be found at electronics swap meets, in
computer surplus outlets, and even in trash dumpsters. In addition to a stepper,
a typical full-height 5.25 inch disk drive includes a 12 volt DC motor with
tachometer and motor control circuit board, two microswitches, and a matched
LED-photosensor pair....(schematic design 6/06)
