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ADC to PC interface transfers data in nibbles : 12/09/99 EDN-Design
Ideas / The circuit in Figure 1 uses a Centronics printer port
to interface an eight-channel, 8-bit ADC to a PC. The circuit
cuts the cost of addressing and decoder circuitry and saves one
expansion slot for interfacing. The design uses three of the
subport... |
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LFSR provides encryption: 09/13/2001 EDN - Design Ideas /
LFSRs (linear-feedback shift registers) find extensive use in
cryptography. For example, the cryptographic algorithms in the
GSM (Global System for Mobile communications) mobile-phone
system rely on the use of LFSRs. An LFSR comprises a register
containing a sequence of bits and a feedback function. . |
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Manchester co decoder fits into 32 macrocell PLD: 01/06/00
EDN-Design Ideas / Manchester encoding is common, and this
scheme erases the dc-spectrum component present in an NRZ signal
in baseband transmissions. An important application is in
Ethernet-interface adapters, in which several kinds of
media-attachment units interfac... |
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Microcontroller visualizes hex code: 04/27/00 EDN-Design
Ideas / In C systems, information exchanges usually use the
hexadecimal 1-2-4-8 format; output data also appear in this
format. Reading the hex code is not a problem; several LEDs
connected to the output lines can display the answer. The
problem arises when you w... |
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Rotary encoder mates with digital potentiometer: 03/06/03
EDN-Design Ideas / In developing electronic systems, designers
look for products or ideas that may benefit from the better
performance, smaller size, lower cost, and improved reliability
that an IC can offer. Toward that end, the digital potentiometer
emerged as an alternative to its mechanical counterpart, the
mechanical potentiometer... |
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Sequential channel selector simplifies software: 01/04/01
EDN-Design Ideas / An efficient but powerful circuit is useful
for a variety of applications with limited I/O and for which you
want to use one input to sequentially select a different output
channel ( Figure 1 ). When the software changes the state of
only one input,... |
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Simple phototimer controls load: 04/18/2002 EDN - Design
Ideas / In industrial and home applications, the need sometimes
exists for a device that, after activation by some physical
effect, such as light, temperature, or sound, switches a load on
for a predetermined time. The load, such as a lamp, motor,
solenoid, or heater, usually derives its power from the ac line.
. |
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Single printer port pin acts as an encoder output: 06/07/01
EDN-Design Ideas / ( Encoders and decoders are common elements
in alarm, remote-control, and measurement systems. However, most
of these devices require many I/O lines when under
microprocessor or PC control. For example, the HT-12E encoder
has eight address pins, four... |
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Use your printer port as a high current ammeter: 07/06/00
EDN-Design Ideas / With a few inexpensive components and INT1Ch,
you can turn the printer port of your PC into a high-current
ammeter.... |
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You've got mail: 08/19/99 EDN-Design Ideas / Many e-mail
programs provide a "beep" or a pop-up message box signaling the
user that a new e-mail message has arrived. If the you are too
far from the computer to hear the audible signal or if the
monitor is turned off, then you miss the new-mail a...
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