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Smartcard PC Emulator - This smartcard adapter follow exactly
the specification ISO 7816. Also, the protocol is the "asynchronous half duplex T=0 protocol" with "active low
reset" and "inverse convention" as defined in this standard. The following description may be used in order to
connect computers to ISO 7816 compatible chip. . . [designed by Markus Kuhn]
SMBus
Accelerator Improves Data Integrity – Design Note 193 -
DN193 Design Notes (Linear Technology). . . [Linear Technology]
Soft limiter for oscillator circuits uses emitter-degenerated differential pair - 10/12/06 EDN Design Idea Phase-shift network plus a few active components yields
low-distortion output - Most oscillator circuits include a nonlinear amplitude control that sustains oscillations
at a desired amplitude with minimum output distortion. One . . . [by Douglas Sudjian, Resonext Communications
Inc, San Jose, CA]
Soft-Start Module - Simple circuit that reduces surge current on start of an induction motor. . . . [Wichit
Sirichote, designer]
Software Code EE-236 - EE-236
Analog Devices App Note. . .
Software Code
EE-247 - EE-247 Analog Devices App Note. . .
Software Code
EE-248 - EE-248 Analog Devices App Note. . .
Software I2C Routine for the COP8 - Application Note. . . [National Semiconductor]
Software Implementation of Asynchronous Serial I/O - Application Note Published 26-Aug-97. . . [Microchip]
Software Implementation of I²C Bus Master - Application Note Published 26-Aug-97. . . [Microchip]
Software Implements Digital Potentiometer - 06/08/95 EDN Design Idea In some applications (for example, dynamic biasing of laser
diodes) , the use of digital potentiometers, or trimDACs, has limitations because of resolution, accuracy, or
interface difficulties. Using the simple (but maybe not so obv. . . [by Gray Creager,Xicor Inc, Milpitas, CA]
Software makes full use of 8051's interrupt system - 12/06/01 EDN Design Idea The program in Listing 1 uses a pseudo-RETI instruction to
provide a five-priority-level interrupt system for the 8051P microcontroller. The interrupt-priority order, from
high to low, is INT0 IT0 INT1 IT1 INTP. Before the pseudo-RE. . . [by Deng Yong, Shanghai Jiaotong University,
China]
Software PLL locks
VCXO to reference - 08/01/98 EDN Design Idea (File has
several circuit ideas. Scroll to find this one. ) The circuit in Figure 1 provides a precisely controlled clock
signal. The method modifies the controller's quartz oscillator such that the control voltage at point P1 controls
the frequency. A D/A converter using an R-2R ladder n. . . [by Martin Ossmann, Philips Research Labs, Aachen,
Germany]
Software PLL locks
VCXO to reference - 08/01/98 EDN Design Idea The
circuit in Figure 1 provides a precisely controlled clock signal. The method modifies the controller's quartz
oscillator such that the control voltage at point P1 controls the frequency. A D/A converter using an R-2R ladder
network connected to output port D generates the control voltage. A precise reference-frequency signalMultiple
circuits in this file. . . [by Martin Ossmann, Philips Research Labs, Aachen, Germany]
Software provides interrupt system for 8052 - 11/23/00 EDN Design Idea By using a pseudo-RETI instruction, the program in Listing 1
provides a three-priority-level interrupt system for the 8051 mC. Among the three interrupt sources in the
routine, external Request 0 (INTO) hasPDF contains multiple . . . [by Deng Yong, Shanghai Jiaotong University,
China]
Software Routine Minimizes Large Logic Tables - 07/03/97 EDN Design Idea You can define combinatorial logic circuitry by explicitly
stating the output patterns that result from particular input patterns. Such behavioral description is sometimes
more convenient than writing logic equations; virtually all logic-design systems accept table entry, among other
entry formats. Unfortunately, limitations of allowable table size preclude direct minimization of large logic
tables. The technique proposed here uses Espresso, a public-domain logic minimizer available from the University
of California--Berkeley. . . . [by Jerzy Chrzaszcz, Warsaw University of Technology, Warsaw, Poland]
Software routine stabilizes hardware register
- 07/18/96 EDN Design Idea Microprocessor peripheral devices with multibyte
registers often harbor a subtle bug that can bite the unwary software engineer. If your program reads the
peripheral device's registers at the same time that the device is updating those registers, the program can
obtain a mixed result. One or more of the bytes could be left over from a previous reading, . . . [by Greg
Young, Z-World Engineering, Davis, CA]
Software snippet provides improved subset-sum algorithm - 09/25/03 EDN Design Idea The subset-sum problem is one of the most frequently occurring
NP (nondeterministic, polynomial-time]-complete] problems. It asks whether a subset of numbers in a set of
positive integers adds up exactly to a given value. A relaxed . . . [by Ivan Basov, Brandeis University,
Waltham, MA]
Solar Charged LED Utility Light - Tired of always spending money on flashlight batteries only to have them fail just when you
need them? Try this simple circuit out. It would make an excellent science fair project. The white LEDs are quite
bright, they provide enough light to illuminate a small room at night. The LEDs produce a nicely focused beam.
You can read by the light of this device. . . . [G. Forrest Cook]
Solar Energy Meter - Turn 8051SBC to be a dedicated instrument for measuring AC energy when sunshine. . . . [Wichit
Sirichote, designer]
Solar Powered Reading Lamp - The goal of this project was to produce a self contained reading lamp that could be used by
students in developing countries for reading at night. The circuit can be used for a wide variety of lighting
applications. . . [G. Forrest Cook]
Solar Recorder - The PIC Solar recorder for daily insolation measurement. . . . [Wichit Sirichote, designer]
Sonic Distortion - . . .
Sonicguide Helps
Blind Ambulate Freely - Analog Devices-Analog Dialogue. .
. [by Smith, Russell]
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