|
PC Interface for Point Controller - (electronic circuit added 4/05)
|
|
PC IR Remote Control - This page gives some information on a PC
based IR remote control system I've developed for computer control of TV,
video, satellite and hifi equipment etc. [Chris Dodge] |
|
PC IR Remote Control Hardware - (electronic circuit added 4/05)
|
| PC securely controls relay - 11/23/95
EDN-Design Ideas When a PC-driven solid-state or electromechanical relay
controls external equipment, take care to design an interface that avoids
false triggering. The interface circuit in Figure 1a switches the relay on and
off only after a specific sequence of outputs. Thus, this design protects the
relay against the influence of computer-reset and I/O operations that some
drivers perform during system start-up to locate add-on cards.... [Design Idea
by Jerzy R Chrzaszcz, Institute of Computer Science, Warsaw University of
Technology Warsaw, Poland |
|
PC Speaker Volume Control Circuit - This simple circuit can be used
to control the volume of PC speaker. The volume can be adjusted to any value
between total silence and full volume…..(circuit / schematic design added
6/06) |
|
PCB for Mark 5 IR Extender - The latest addition to my collection of
Infra Red (IR) Repeater circuits. The Mark 5 is a much improved version of the
Mark 1 circuit and has increased range and sensitivity. It is also immune to
the effects ofambient light, daylight and other forms of interference. In
addition it works with IR [Andy Collison] |
|
PC-Based DC Motor Speed Controller - (electronic circuit added 4/05)
|
|
Peltier Coolers/Heaters - A typical peltier device consists of a
number of series-connected Nand P-type semiconductors sandwiched between two
ceramic plates, such that the flow of majority carriers (electrons or holes)
in each semiconductor occurs in a single direction, as shown.... ASCII format
(Circuit design added 9/06) |
|
Peltier Element Controls Itself - 10/27/94 EDN-Design Ideas
Peltier elements, or semiconductor heat pumps, combined with heat sinks are a
designer's choice when controlled low temperature is required for CCDs and
high-density ICs. These devices are suitable for device temperature cycling in
reliability tests.... EDN is migrating links. This link is not verified.
Google the "title" EDN for new link. |
|
PIC Based Motor Controller - (circuit / schematic added 2/03)
|
|
PIC IR/ RF Remote Control - This is a general purpose remote control
project with using programmable PIC microcontrollers (PIC16F628, PIC16F630,
PIC16F684). Schematics are shown for using infrared (IR) or radio (RF) media.
If you are not familiar with microcontroller programming, you can use fixed
encoder and decoder integrated circuits instead. Well-known such IC-s are
Holtek HT-12D, HT-12E and Motorola MC145026, MC145027, MC145028. ….(electronic
schematic added 11/08) |
|
PIC plots pixels sans Controller - 02/16/98 EDN-Design Ideas
It is sometimes desirable to display the output of a PIC µC graphically,
rather than numerically. However, the operation increases system complexity
and expense. In addition to the LCD itself, you usually need a graphics
controller and at least 1 kbyte of RAM. However, you can obtain a satisfactory
plot (Figure 1].... [Design Idea by Daryl Christopher, Juniata College, and
Tom Fisher, Inexpensive Systems, Huntingdon, PA] |
|
PIC Remote Control - 5 channels are controlled via RF receiver / RF
transmitter and PIC12C508 microcontroller. ….(Circuit design added 11/08)
|
|
PIC Remote Control - 4 / 8 channel RF / IR remote control based on
PIC16F628 and PIC16F630…. [Peter Jakab, Electrical Engineer, Engineer of
Informatics] |
|
PIC12c508 Night Light Saver - (circuit added 2/07)2) |
|
PIC16c505 IR/Wireless Remote Control - (electronic circuit added
7/03) [Peter Jakab, Electrical Engineer, Engineer of Informatics] |
|
PIC16F84 Miniature Real Time Controller - Build a simple real-time
controller with PIC16F84 running at low power X-tal 32,768Hz. Daily scheduler
for 6-channel resided in 64-byte EEPROM can easily be preprogrammed using
Nigel PicProg.... [Wichit Sirichote] |
|
PIC16F84 RF remote Controller - With a handful of inexpensive
components, a little creativity, and the power of PicBasic, you can build some
pretty outstanding robotics creations as Rob Arnold proves with his Ruf-Bot
project… [Rob Arnold] |
|
PIC16F873 Light Controller - (circuit / schematic design added 6/06)
|
|
PID-Control with 68HC12 - ….(Circuit design added 07/08/09)
|
|
Pinewood Derby Finish Line Using a Computer-Scores times & places. -
(circuit diagram added 6/07) |
|
Plane Motor Controller with High-Rate ESC, BEC & Brake - This
electronic speed control (ESC) for brushed motors combines the features of two
of my earlier designs. One was a high-rate 30A ESC with a brake, and the other
a high-rate 12A ESC with a BEC (receiver battery eliminator circuit)…..
[Stefan Vorketter] |
|
PLL implements FPGA-based SDRAM controller - 03/26/98 EDN-Design
Ideas As FPGA capabilities increase and time to market decreases, FPGAs
gain more acceptance for implementing both data and control paths. Thus, they
find wide use as controllers and datapath glue logic for fast-page DRAMs.
Synchronous DRAMs (SDRAMs), whose control signals use a clock input as
reference, are a natural target for FPGA-based controllers…. [Design Idea by
Eddy Debaere, Barco Graphics, Ghent, Belgium] |
|
PLL-based converter controls light source - 07/02/98 EDN-Design
Ideas Using the circuit in Figure 1 , you can digitally control the
light intensity of a lamp. The control loop is based on a PLL, in which the
VCO comprises a light-to-frequency converter (TSL220) coupled to a light
source that derives....PDF has several circuits, please scroll to find this
one.... [Design Idea by MASSIMO GOTTARDI, ITC-IRST, TRENTO, ITALY] |
|
Pocket LED Light - An LED pocket light operates with only one cell
of battery. (added 10/05) |
| Position detectors provide Motor-control
logic - 05/24/01 EDN-Design Ideas In the circuit of Figure 1 ,
assume that a brush-type dc motor must drive a load back and forth between two
endpoints on a lead screw. Optical sensors determine end of travel, and an
SPDT switch selects to which end to send the load. The sensors themselves
supply all the necessary directional logic, and a triac powers the motor with
the necessary polarity of half-wave pulses from the 13….PDF have several
circuits, scroll for this one.... [Design Idea by Steve Pomeroy and
Russell Hedges, Elgar Corp, San Diego, CA] |
|
Power Chopper 1 - (Schematic added 10/06) |
|
Power Factor Corrector - (application / block diagram added 6/07)
|
|
Power Output Stage Automatic Bias System Control IC LT1166 - DN126
Design Notes (Linear Technology) (app note added 1/06) |
|
Power source is insensitive to load changes - 4-Apr-02 Issue of EDN
For the heating and cooling elements common in industrial systems, resistance
is not a fixed quantity. These elements include such devices as
positive-temperature-coefficient heaters and thermoelectric coolers. Their
resistance can changethan 100% during operation, and the result is a change in
power dissipation for elements receiving drive from a fixed voltage or current
source.... [Design Idea by Ken Yang, Maxim Integrated Products, Sunnyvale, CA] |
|
Power-Off Time Delay Relay - The two circuits above illustrate
opening a relay contact a short time after the ignition or light switch is
turned off. The capacitor is charged and the relay is closed when the voltage
at the diode anode rises to +12 volts. The circuit on the left is a common
collector or emitter follower and has the advantage of one less part since a
resistor is not needed in series with the transistor base. However the voltage
across the relay coil will be two diode drops less than the supply voltage, or
about 11 volts for a 12.5 volt input. The common emitter configuration on the
right offers the.... |
|
Power-On Time Delay Relay - Here's a power-on time delay relay
circuit that takes advantage of the emitter/base breakdown voltage of an
ordinary bi-polar transistor. The reverse connected emitter/base junction of a
2N3904 transistor is used as an 8 volt zener diode which creates a higher
turn-on voltage for the Darlington connected transistor pair. Most any
bi-polar transistor may be used, but the zener voltage will vary from about 6
to 9 volts depending on the particular transistor used. Time delay is roughly
7 seconds using a 47K resistor and 100uF capacitor and can be reduced by
reducing the R or C values. Longer... |
|
Precision active load operates as low as 2V - 4-Aug-05 Issue of EDN
Self-powered active load matches low-voltage sources.... [Design Idea by Joel
Setton, Crolles, France; Edited by Brad Thompson and Fran Granville] |
|
Precision Attenuator with Digital Control - (circuit / schematic
design added 6/06) |
|
Precision Digital AC Power Controller - (electronic Circuit /
Schematic added 10/04) |
|
Precision temperature
controller has thermal-gradient compensation - 12-Jun-08 Issue of
EDN An electronic work-around cancels the effects of thermal gradients
in the load's thermal impedances.... [Design Idea by W Stephen Woodward,
Chapel Hill, NC] |
|
Printer Port Controls A/D Conversion - 12/19/96 EDN-Design Ideas
The circuit in Figue 1 uses a microcontroller (PIC16C71] as an A/D converter
and a data organizer. The circuit plugs directly into a PC printer port and
needs no external power supply. Under the control of the Borland C program in
Listing 1, the µC selects one of three analog channels, performs A/D
conversion, sends low and high nibbles of converted data back to the printer
port, and waits for the next command.... [Design Idea by Yongping Xia, Philips
Lighting Electronics Co, Torrance, CA] |
|
Printer Port Controls Amplifier's Gain - 10/26/95 EDN-Design Ideas
The circuit in Fig 1 lets you use a PC's printer port to set the gain of an
inverting amplifier. The circuit uses a 4-to-1 analog multiplexer, IC1, to
select a pair of external resistors. The multiplexer's connection scheme
ensures that the on-state resistance of the analog switches does not affect
the performance of the circuit. The on-state series resistance is negligible
in comparison with the high input impedance of the op amp. The op amp's gain
is, thus, the ratio of the two network resistances R2/R1.... [Design Idea by
Bogdan Manolescu, Gunicom Professional, Bucharest, Romania] |
|
Printer Port Controls Video Multiplexer - 08/01/96 EDN-Design Ideas
The circuit in Figure 1 is a four-channel video-signal multiplexer. Eight-bit
binary data (of which only 3 bits are used] from a PC's parallel printer port
controls the multiplexing operation. The inputs for all the channel....
[Design Idea by Shyam Tiwari, SR&HPG, IGCAR, Kalpakkam, India] |
|
Processor Controls Watchdog Circuit - 01/18/96 EDN-Design Ideas
The simple watchdog circuit in Figure 1 allows you to use the same line to
provide additional information about the system's operation by closing or
opening.… [Design Idea by Sergey Velichko, SCP, Boise, ID] |
|
Processor's PWM output controls LCD/LED driver - 27-May-04 Issue of
EDN The PWM (pulse-width-modulation] output available from many
microprocessors is based on an internal 8- or 16-bit counter and features a
programmable duty cycle. It is suitable for adjusting the output of an LCD
driver (Figure 1], a negative-voltage LCD driver (Figure 2], or a
current-controlled LED driver (Figure 3].... [Design Idea by Joe Neubauer,
Maxim Integrated Products, Sunnyvale, CA] |
|
Programmable light relay - Schematic only, no circuit description
|
|
Programming the Automatic Fan Speed Control Loop - AN-613 Analog
Devices Application Note (app note added 2/06) |
|
Proportional Radio Remote Control - Electroinic circuit design….
[from Harry Lythall's website] |
|
Proportional-ac-power controller
doles out whole cycles of ac line - 4-Sep-08 Issue of EDN A
pulsed current mirror comprising discrete transistors drives LEDs from a low
voltage, avoiding thermal runaway.... [Design Idea by Richard Rice,
Oconomowoc, WI] |
|
Pulse Width Modulation DC Motor Control (Aaron Cake) - controls the
motor speed by driving the motor with short pulses (added 4/05) |
|
Pump Controller - Having a reliable system to pump out a sump pit is
essential as mistakes and failures can lead to serious flooding and enormous
expense. In our article Sump Pump Control System we introduced a selection of
electronic solutions to the following problems.... [REUK - Renewable Energy UK
website] |
|
Push Button Motor Control - This circuit uses solid state switching
(transistors) to control direction of a DC motor. You have precise control of
the movement of the motor, and an indication of direction provided by
LED's….(circuit / schematic design added 6/06) |
|
Pushbutton Controlled Up/Down Ramping Light - There are times when
you want a lamp to gradually change from dark to light and from light to dark,
with each push of a pushbutton switch. The circuit below performs this
control function using a flip/flop and a classic pulse width modulation or PWM
method. The circuit uses a common flip/flop IC to control the on and off
logic states. A simple pushbutton switch toggles between the two states with
each press of the button.... [Designed by David A. Johnson] |
|
Pushbutton Switch Controls Power Supply & µC - 09/25/97 EDN-Design
Ideas Switching handheld units on and off with a pushbutton switch is a
desirable feature. Thus, switching-regulator/ controller ICs for
battery-powered applications provide a logic input to switch the device to a
shutdown mode. This type of shutdown pin can require additional
components.... [Design Idea by Greg Dittmer, Linear Technology Corp, Milpitas,
CA] |
|
Push-Pull Converter - (application / block diagram added 6/07)
|
|
PWM Basics Apex-AN30 - Apex App Note (added 08/08/08) |
|
PWM Circuit for Motor Speed Control - Sometimes you want to slow
down a brush type DC motor. The most efficient way to do this is with a pulse
width modulation (PWM) technique. The hobby circuit below can operate from
about 3 volts to 15 volts. The frequency is fixed at about 2KHz but the pulse
width can be varied from nearly 100% to 0%.... [Hobby Corner Circuit by Dave
Johnson] |
|
PWM Control for Hydrogen Generators - Unlike conventional PWM
Circuits,This circuit also has a special "Current Limit Control". "If your
H-Cell gets hotter and tries to draw more current,This circuit won't let
it"…..(circuit / schematic design added 11/06) |
|
PWM Controller - This controller will deliver up to 30 amps and
control the motor from 5% to 95%. |
|
PWM Controller - 555 Timer based PWM motor control project for
electric fan or other DC motor (added 6/06) |
|
PWM DC Motor Control with SG3525 - (circuit / schematic design added
6/06) |
|
PWM DC Motor Speed Control - This is a circuit for controlling the
speed of small DC motors, it works nicely as a speed controller for an HO or N
gauge model railroad… [Circuit Design by G. Forrest Cook] |
|
PWM Motor Controller - Schematic only, no circuit description [drawn
by Rich Rudman] |
|
PWM Motor/Light Controller - The diagrams are for 12V operation only
and there are high side (common ground) and low side (common +12V) versions.
The low side version of the circuit uses an N Channel FET, the high side
version of the circuit uses a P Channel FET. N Channel devices tend to handle
more current than P Channel devices, they are also less expensive. The high
side version of the circuit is useful when one side of the load has to be
grounded.... [G. Forrest Cook] |
|
PWM Speed Control - includes theory and some example circuits (added
6/06) |
|
Quartz Crystal Synchronizer for Pendulum Windup Wall Clock - Last
year, I found a 31 day pendulum wall clock (dissambled) in a box of parts at a
swap meet and decided to try and put it together and regulate it with a quartz
crystal oscillator. The escapement ….(design added 06/09) |
|
Quartz crystal-based remote thermometer features direct Celsius readout -
17-Mar-05 Issue of EDN Although quartz crystals have served as
temperature sensors, designers haven't taken advantage of the technology
because few manufacturers offer the sensors as standard products (references 1
and 2]. In contrast to conventional resistance- or semiconductor-based
sensors, a quartz-based sensor provides inherently digital-signal
conditioning, good stability, and a direct digital ou.... [Design Idea by Jim
Williams and Mark Thoren, Linear Technology Corp; Edited by Brad Thompson] |
