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Computer Interfaces
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Computer Interface:
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Last
Updated on:
Thursday, November 30, 2017 01:57 PM
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
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Electrically Isolated Rs422 Interface Using Sn75176b Or Max485 - (diagram
added 2/07) |
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Electrically isolated RS485 interface using MAX487 or SN75176B - (diagram
added 2/07) |
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Electronic Distance Meter - Simple device for measuring distance while
riding bicycle. The 16-pin Nitron chip interfaces 16x1 line LCD! (circuit added
09/09) |
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Electronic Lock (Bill Bowden) - The digital lock shown below uses 4 common
logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The
first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated....(added
05/07) |
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Embedded processor directly drives LCD - 9-Jan-03 Issue of EDN Driving
a bare LCD does not necessarily require specialized interface circuitry or
peripherals. This Design Idea describes an alternative drive scheme, which you
can easily implement using the general-purpose outputs of a microcontroller. Many
embedded-system applications need to interact with a user by displaying simple numeric
or alphanumeric characters.... [Design Idea by Daniel Malik, Motorola, Czech Republic] |
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Emissions killers Trap Common Mode Currents - 03/02/98 EDN-Design Ideas
- Unshielded twisted-pair cable that is transformer-coupled to a digital system can
easily act as a radiating antenna because of common-mode currents induced by unwanted
stray coupling from the digital portions of the system.…File contains many circuits,
please scroll to find this one.... [Design Idea by Glen Chenier, Fujitsu Network
Communications, Richardson, TX] |
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Emulate SPI signals with a digital I/O card - 17-Sep-09 Issue of EDN
Four I/O lines let you test microcontroller-based products.... [Design Idea by Andy
Street, Autoliv Electronics, Lowell, MA] |
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Enabling Redundancy In Multi-Gigabit Links with DS40mb200 Mux/Buffer -
National Semiconductor Application Note (app note added 2/06) |
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Encoder and PC make complete motor-control system - 12-Dec-02 Issue of EDN
This Design Idea combines a simple ISA-bus-resident interface circuit; a
garden-variety PC; a high-resolution optical shaft encoder; and a PWM-controlled,
0.05-hp, brushed, permanent-magnet dc motor to make a high-precision and high-power
motion-control system. The system sequences the precise rotation of an evacuated steel
bell jar several feet in diameter, such as those used in molecular-beam.... [Design
Idea by Steve Woodward, University of North Carolina, Chapel Hill, NC] |
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Encrypted routines impede hackers, protect licenses - 4-Apr-02 Issue of EDN
The use of public-key-encrypted algorithms within licensed applications can prevent
hackers from cracking the licensed algorithms. Moreover, you can use them to disable
licensed features that a user doesn't purchase. Licensing schemes eventually arrive at
some critical decision point at which an algorithm decides whether the user is
entitled to run that application.... [Design Idea by Lawrence Arendt, Oak Bluff, MB,
Canada] |
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Envelope follower combines fast response, low ripple - 26-Dec-02 Issue of
EDN Envelope followers extract amplitude information from complex audio
waveforms. The resulting dc voltage often drives nonlinear stages, such as
voltage-controlled amplifiers or filters. You must make a careful trade-off between
the speed of response to a rapidly changing input signal and the amount of ripple in
the dc output that you can tolerate.... [Design Idea by Harry Bissell, Royal Oak, MI] |
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Envelope Tracker Quells Jitter - 07/07/94 EDN-Design Ideas Fig 1's
envelope tracking circuit solves the problem of receiving ac-coupled NRZ data over a
coaxial data link. Because the spectral content of the NRZ data approaches dc (even
with alternate frame inversion], the signal tends to integrate in any ac-coupled stage
preceding the zero-crossing detector, despite the low cutoff frequencies. Thus, the dc
level of the received data wanders, changing the relative switching point at the
comparator....[Design Idea added 3/03] EDN is migrating links. This link is not
verified. Google the "title" EDN for new link. |
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