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Speed Acces to µP's
Real-Time Clock - 06/05/98 EDN Design Idea (Scroll
to find this circuit) The DS5000T (Dallas Semiconductors, www. dalsemi. com) is an 8051-compatible processor
that integrates nonvolatile memory and a real-time clock. This module has an impressive set of functional
extensio. . . [by Jerzy Chrzaszcz, Warsaw University of Technology, Warsaw, Poland]
SP-L Modulator uses Single Speed Bit Clock - 08/15/97 EDN Design Idea Split-level (SP-L) , or Manchester, encoding is a common
modulation scheme in data transmission (Figure 1). SP-L is popular because bit-clock extraction at the
receiving end is easy, and the modulator circuit is simple to implement--simple, but not trivial, because the
output of this classic circuit suffers from severe spikes during data transitions (Figure 2). A different
circuit eliminates the spiking problem (Figure 3). This circuit resamples data after stabilization, but to do
so, it needs a double-speed clock. This need can be as annoying as having spikes. . . . [by Massimo
Garavaglia, Robecchetto con Induno, Italy]
Stepper Control - . . . [Ludwig Orgler-Fachingenieur Elektrotechnik]
Sun-Up Alarm - The Sun-Up Alarm can be used to provide a audible alarm for when the sun comes up or it can
be used in a dark area and detect when a light comes on. It can also be used to detect a light beam,
headlights etc. The circuit works as follows. The phototransistor is very sensitive to light. (Any
phototransistor will work fine) . . . [Randy Linscott]
Supporting
FDDI with the ADN2812 - AN-746 Analog Devices App
Note. . .
System implements digital clock modulation - 10/28/04 EDN Design Idea In spread-spectrum and direct-sequence receivers, it's often
necessary to change the frequency of the clock oscillator, and thus the spreading-code clock, to lock the
receiver's reference pseudorandom-noise code to the incoming cod. . . [by Dan Doberstein, DKD Instruments,
Nipomo, CA]
System's real-time clock "hides" a code sequence - 10/27/05 EDN Design Idea Keep key code sections protected from prying users. . . [by
Mihaela Costin, Delmhorst Instruments, Towaco, NJ]
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