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PC Serial & Parallel Port Software & Interfaces - circuit (added
11/05) |
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PIC Programmer - As you can see, only a few standard elements are
used and the hardware is very simple to build. So here are only a few words
about hardware. Supply voltage can be either AC or DC. Voltage Vdd must be
between 4.5 and 5.5 V. For this purpose integrated stabiliser 78L05 (Vdd=5V)
is used. It has current limitation (protection) 100 mA and with this feature
protects inserted PIC from damage in case something is wrong connected.
Programming voltage 13V is provided with 78L08.... [Bojan Dobaj
http://www.picallw.com] |
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PIC16F84 programmer - Electronic circuit (added 11/05)
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PLD code creates PWM generators - 8-Aug-02 Issue of EDN The
PLD (programmable-logic-device] code in Listing 1 creates
arbitrary-resolution, pulse-width-modulated (PWM] generators. PWM generators
are useful as low-bandwidth D/A converters in hardware of
microprocessor-based systems. When you pass it through a simple RC lowpass
filter, a PWM waveform becomes a voltage that's approximately equal to the
PWM duty cycle times the supply voltage.... [Design Idea by Clive Bolton,
Bolton Engineering Inc, Melrose, MA] |
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Power Dissipation the Easy Way Using the Power Design Tool Apex-AN37 - Apex
App Note.... |
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Program Converts hex to floating point - 07/20/95 EDN-Design Ideas....You
might need to use floating-point variables in some embedded software algorithms.
You'll find this easy to do because all modern C compilers come with a floating-point
library. However, when you're debugging a routine, you sometimes need to "peek" or
"poke" a floating-point variable when all you have available is a hexadecimal
interface. This scenario.... [Design Idea by John Santic, Consultant, Frederick,
MD] |
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Program Converts temperature from RTD sensor - 06/05/97 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Program designs single supply OpAmp circuits - 10/26/95 EDN-Design
Ideas....Mathematically, there is no difference between single- and dual-supply op-amp
designs, except for the signal reference. Dual-supply designs inherently reference
signals to ground. However, you must use biasing to reference signals to ground in a
single-supply design, because the signals are inherently referenced to VCC/2.
This requirement for external bias schemes complicates the design procedure. The Basic
program, which you can download from…. [Design Idea by Ronald Mancini and Dave Culver,
Harris Semiconductor, Melbourne, FL] |
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Program Flags Dangerous DOS CommanDS - 02/02/95 EDN-Design Ideas....Windows
users still perform many small housekeeping tasks, such as renaming, moving, or
deleting files, by switching to DOS, because DOS is much faster than the
time-consuming, icon-driven facilities of Windows. However, you should not use certain
DOS features, such as CHKDSK or tape backup, when Windows is running. Windows, because
it is a multitasking operating system, maintains several open and swap files.... EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Program generates Braille dot code - 12/19/96 EDN-Design Ideas....The Basic
training program in Listing 1 helps visually handicapped people easily learn
Braille dot code with the help of a trainer. The trainer generates six-pin Braille
code using six solenoids operating on an LPT1/2 either by directly connecting the
low-power solenoids to the data bits of the parallel port or by driving solenoid pins
(pull-out type] using an UN2003 power driver (Figure 1]. Push-in type solenoids
require complemented (0 for 1 and 1 for 0] Braille-code data bits or an extra inverter
on the LPT1 port.... [Design Idea by Jose Carlos Cossio, Santander, Spain] |
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Program helps convert OrCAD libraries - 09/14/95 EDN-Design Ideas....A
simple Borland Turbo C 2.00 program, BIT2VEC.C, is useful for anyone using OrCAD SDT
CAE software. The program, which you can download from EDN's FTP server (DI #1755],
helps to convert OrCAD libraries from bit map to vector format.... [Design Idea by
Vincenzo Carlotti, Roland Europe SPA, Acquaviva Picena, ITALY] |
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Program Matches filter network impedances - 07/20/95 EDN-Design Ideas....In
RF circuits, it's often necessary to match one impedance to another. The program in
the Listing 1 can design a network to match any resistive impedance R1 to another R2
(where R1 is less than R2] at a specified frequency and specified Q. The program
employs a lossless (in theory] network that uses just capacitors and inductors. Five
matching networks.... [Design Idea by David Kirkby, University College, London, UK] |
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Program predicts VSWR mismatch RF uncertainties - 02/01/01 EDN-Design
Ideas....Hewlett-Packard (now Agilent Technologies] once offered a useful little
cardboard slide rule for calculating the uncertainty in RF measurements
stemming.... [Design Idea by Steve Hageman, Agilent Technologies, Santa Rosa, CA]
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Program provides integer to binary Conversion - 03/02/98 EDN-Design
Ideas....A simple and inexpensive implementation using an eight-pin 12C508 controller
(Microchip Technology, Chandler, AZ] provides both bit-rate detection and a
synchronous, appended-clock output from an asynchronous input-data stream (Figure
1a].…File contains many circuits, please scroll to find this one.... [Design Idea by
Bert Erickson, Fayetteville, NY] |
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Program provides ISA bus DLL for Windows #2 - 09 May- 96 Issue of EDN
Windows commonly uses a dynamic link library (DLL]to create subroutines and procedures
that all compatible software can call. A DLL is an executable file, with
extension.DLL, that a program can load and unload as required. However, not all
Windows-based software can read from and write to the ISA bus in a PC. The DLL
described here provides 8- and 16-bit I/O reads and writes to the ISA bus.... [Design
Idea by Paul Kemp, NASA Johnson Space Center, Houston, TX] |
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Program Turns PC Sound Card into a Function Generator - 09/02/99 EDN-Design
Ideas EDN is migrating links. This link is not verified. Search the
"title" EDN for new link. |
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Programable LCD counter with memory backup - This counter based on
AT90S1200A its programmable and when shut it down its keeping the current counts to
the memory, until to the power on.…. [Copyright 2003 Serasidis Vasilis] |
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Programmable analog circuits yield single-chip sinusoidal oscillators -
01/19/06 EDN-Design Ideas....Internally programmed low-pass filters yield classic RC
oscillator.... EDN is migrating links. This link is not verified. Search the
"title" EDN for new link. |
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Programmable Charger Fills Capacitor Banks - 10/08/98 EDN-Design
Ideas....Designed for the use with a pyrotechnic pulse generator, the charger in
Figure 1 uses low-cost components to charge the C1 capacitor bank to a voltage
as high as 75V, or to 25V in a few seconds. A 555 timer, IC1, controls a flyback
converter via the Q1 transistor switch....Contains several designs, scroll to
find this one.... [Design Idea by Dennis Feucht, Innovatia Labs, Townville, PA] |
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Programmable Clock Oscillator - PIC-Tock video clock using a PIC16C61.
Voltage controller oscillator that was designed as a wide range oscillator to generate
clock pulses for a stepper motor drive system, frequency could be varied
over1,000,000:1 (added 4/02) |
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Programmable Current-source powers charger - 06/22/95 EDN-Design Ideas EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Programmable current-source requires no power supply - 12-Jun-08 Issue of
EDN A programmable current source is useful for creating I-V curves, charging
and discharging batteries, preloading power supplies, and many other applications....
[Design Idea by John Guy, National Semiconductor, Santa Clara, CA] |
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Programmable Digital Code Lock - Schematic/circuit (added 11/05)
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Programmable diode biases bridge - 17-Mar-94 Issue of EDN-Design Ideas....A
programmable reference diode, such as the Motorola TL431A, can supply constant-current
bias for a silicon pressure-sensor bridge (Fig 1]. This circuit is simpler than
using an op amp and separate reference diode or than using a current diode, which
requires temperature compensation.The TL431A produces a VREF of 2.5V over a current
range of 1 to 100 mA. The value.... [Design by Patrick J Worcester, KAKM TV,
Anchorage, AK] |
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Programmable divider restores SVGA pixel clock - 03/28/96 EDN-Design
Ideas.... EDN is migrating links. This link is not verified. Search the "title"
EDN for new link. |
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Programmable filter uses parallel processing - 05/23/96 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Programmable impedance has 12-bit resolution - 05/23/96 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Programmable LED Flashers - LED goes to steady state after a preset number
of flashes. Two simple, wide supply range operating circuits. ....
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Programmable light relay - Schematic only, no circuit description
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Programmable oscillator uses digital potentiometers - 7-Mar-02 Issue of EDN
Digital potentiometers are versatile devices; you can use them in many filtering and
waveform-generation applications. This Design Idea describes an oscillator in
which setting the resistance of two digital potentiometers independently programs the
oscillation amplitude and frequency. Figure 1 shows a typical diode-stabilized
Wien-bridge oscillator that generates accurate sine waves fro.... [Design Idea by Alan
Li, Analog Devices, San Jose, CA] |
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Programmable Ramp Generator has 14 Bit Linearity - 09/12/96 EDN-Design
IdeasThis linear ramp generator uses a DAC, a transistor array, MOSFET switches, and
current-steering techniques to achieve 14-bit linearity (Figure 1]. The output current
of IC1, a DAC-10, is a product of the digital code and the reference-current input,
where IO=(code/1024]×2IR. IR is the.... EDN is migrating links. This link is not
verified. Google the "title" EDN for new link. |
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Programmable source powers DC micromotors - 03/01/01 EDN-Design Ideas....A
simple, economic, compact, and tricky way of using the LM723 as a programmable voltage
source to drive dc micromotors which can set the output to a value of200 mV to 6V....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Programmable Timer for Appliances - circuit (added 11/05) |
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Programmable-gain amplifier is low-cost 01/18/01 EDN-Design Ideas....Numerous
programmablegain amplifiers are available, but a simple solution provides the option
of using 256 gain steps with an 8-bit DAC and higher steps….PDF has several circuits,
scroll down…. [Design Idea by J Jayapandian, Indira Gandhi Centre for Atomic Research,
Kalpakkam, India] |
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Programmed reference oscillator generates nonstandard clock frequencies -
27-Apr-06 Issue of EDN Small assembly-language process exploits equalized,
fixed-length branch loops with only 12 instructions.... [Design Idea by William Grill,
Honeywell BRGA, Lenexa, KS; Edited by Brad Thompson and Fran Granville] |
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Programmer PIC16F84,12C50x & EEPROM 24Cxx - circuit (added 11/05)
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Programmer PIC16F84,12C50x & EEPROM 24Cxx geocities - Electronic circuit
(added 11/05) |
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Programs calculate 1% & ratio resistor pairs - 12/16/05 EDN-Design
Ideas....Computer programs determine the best values for an application.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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