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PAL Controls Simple Dual Port Memory - 04/27/95, EDN-Design Ideas: (design
idea added 6/06) |
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Parallel Port Controls Arbitrary Waveform Generator - 06/13/02, EDN-Design
Ideas: You can use the parallel port of your PC and a few additional components
to generate a powerful, easy-to-use arbitrary-waveform generator. By using a
Visual Basic program with the circuit in Figure 1, you can generate any waveform
(for example, sinusoid, triangle, amplitudeor frequency-modulated, or exponential
decay).....(design idea added 1/05) |
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Parallel Port Servo Controller - (electronic circuit added 4/05) |
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Parking lamp control -
(circuit design added 05/08) |
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PC
Controlled Voltage or Current Source - Fair Waring, site contains annoying popups.
This project was begun as a means to charge and cycle NiCad batteries but has
become a versatile tool for experiments requiring either a controlled voltage up
to +30V and/or a current of +/2.5 Amps. (added 6/06) |
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PC Controls Inexpensive Waveform Generator - 06/06/96, EDN-Design Ideas: The
circuit in Figure 1 is a simple cost-effective waveform generator using PC
control. You calculate the digital image of the desired waveform and store it in
the 32k X 8-bit RAM (62256)through the 74HCT245 data buffer and the 16-bit
local-address.....(design idea added 6/03) |
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PC Controls Light Dimmer - 08/19/99, EDN-Design Ideas: control one light
dimming from PC.....(design idea added 6/06) |
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PC Infrared Remote Control #1 - (circuit / schematic design added 6/06) |
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PC Interface for Point Controller - (electronic circuit added 4/05) |
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PC IR Remote Control - (circuit / schematic design added 6/06) |
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PC IR Remote Control Hardware - (electronic circuit added 4/05) |
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PC Securely Controls Relay - 11/23/95, EDN-Design Ideas: (design idea added
6/06) |
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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) |
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PC Speaker Volume Control Circuit #2 - (circuit / schematic design added 6/06) |
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PC-Based DC Motor Speed Controller - (electronic circuit added 4/05) |
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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) |
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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.....(design idea added 3/03) |
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PIC Based Motor Controller - (circuit / schematic added 2/03) |
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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) |
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PIC Remote Control - 5 channels are controlled via RF receiver / RF
transmitter and PIC12C508 microcontroller.
.(circuit design added 11/08) |
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PIC Remote-Control - 4 / 8 channel RF / IR remote control based on PIC16F628
and PIC16F630. (circuit added 8/06) |
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PIC12c508 Night Light Saver - (circuit added 2/07)2) |
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PIC16c505 IR/Wireless Remote Control - (electronic circuit added 7/03) |
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PIC16F84 Miniature Real Time Controller - (circuit / schematic design added
6/06) |
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PIC16F84 RF remote Controller - (circuit / schematic design added 6/06) |
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PIC16F84 Stepper Motor Controller - (circuit / schematic design added 6/06) |
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PIC16F873 Light Controller - (circuit / schematic design added 6/06) |
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PID-Control with 68HC13 -
.(circuit design added 07/08/09) |
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Pinewood Derby Finish Line Using a Computer - Scores times and places. -
(circuit diagram added 6/07) |
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Plane Motor Controller with High-Rate ESC, BEC and 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). (electronic schematic added
07/07/07) |
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PLL based converter controls light source - 07/02/98, EDN-Design Ideas:
Sometimes, the need arises for a short-circuit tester that supplies a low current
to the device under test (DUT)and also uses voltages lower than 100 mV to prevent
conduction of semiconductors. The circuit in Figure 1 meets these requirements. R1
limits the current in the DUT to0.9 mA. The voltage on the DUT can not exceed the
value set.....(design idea added 2/06) |
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PLL Implements FPGA Based SDRAM Controller - 05/21/98, EDN-Design Ideas: A
simple way to make an oscillator is to use a resistor, a capacitor, and a Schmitt
trigger (Figure 1a). However, this circuit uses several tens of microamperes
because of the voltage transitions at the Schmitt trigger's input. The CMOS device
consumes almost no power when the input is either high or low. Whenever the input
voltage.....(design idea added 11/05) |
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Pocket LED Light - An LED pocket light operates with only one cell of
battery. (added 10/05) |
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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.....(design
idea added 6/06) |
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Power Chopper 1 - (Schematic added 10/06) |
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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) |
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Power Source is Insensitive to Load Changes - 04/04/02, EDN-Design Ideas: 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 change more than 100%.....(design idea added 1/05) |
|
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... |
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Precision active load operates as Low as 2V - 08/04/05, EDN -Design
Ideas.....(design idea added 11/05) This Design Idea presents a self-powered,
precision-active-load circuit that improves on a previously published design
(Reference 1). added features include a wider operating-voltage range of 2 to 50V
or higher and several flexible current-setting modes.... |
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Precision Attenuator with Digital Control - (circuit / schematic design added
6/06) |
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Precision Digital AC Power Controller - (electronic Circuit / Schematic added
10/04) |
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Precision temperature controller has thermal gradient compensation - 06/12/08,
EDN-Design Ideas: An electronic work-around cancels the effects of thermal
gradients in the load's thermal impedances.....(design idea added 09/08) |
|
Printer Port Controls Video Multiplexer - 08/01/96, EDN-Design Ideas: (design
idea added 6/06) |
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Processor Controls Watchdog Circuit - 01/18/96, EDN-Design Ideas: (design
idea added 6/06) |
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Processor's PWM output Controls LCD/LED Driver - 05/27/04, EDN-Design Ideas:
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, a negative-voltage LCD
driver, or a current-controlled LED driver. cost alternative that provides not
only a 4- to 20-mA output,.....(design idea added 1/05) |
|
Programming the Automatic Fan Speed Control Loop - AN-613 Analog Devices
Application Note (app note added 2/06) |
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Proportional ac power controller doles out whole cycles of AC line - 09/04/08,
EDN-Design Ideas: A pulsed current mirror comprising discrete transistors drives
LEDs from a low voltage, avoiding thermal runaway.....(design idea added 008/09) |
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Proportional Radio Remote Control - (electronic circuit added 4/05) |
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Provide 4 to 20 Mpwm Control - 09/01/98, EDN-Design Ideas: -Are useful
when you use4to20-mA current-loop signals to control a PWM signal.....(design idea
added 5/02) |
|
Pulse Width Modulation DC Motor Control (Aaron Cake) - controls the motor
speed by driving the motor with short pulses (added 4/05) |
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Push Button Motor Control - (electronic design added 6/07) |
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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) |
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Pushbutton Switch Controls Power Supply and ΅C - 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 added
3/03) |
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Pushbutton Switch Debouncer - (electronic Circuit diagram added 03/03/03) |
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Push-Pull Converter - (application / block diagram added 6/07) |
|
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%. ...
.(designed by David A. Johnson) |
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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 - Power this project from sunlight with a CirKits
solar power circuit board kit. (circuit / schematic design added 04/03/02) |
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PWM Motor Control (mondo-technology) -
.(circuit design added 05/09) |
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PWM motor Controller - (circuit / schematic design added 6/06) |
|
PWM Motor Speed Controller / DC Light Dimmer - A pulse width modulator (PWM)
is a device that may be used as an efficient light dimmer or DC motor speed
controller. The circuit described here is for a general purpose device that can
control DC devices which draw up to a few amps of current. The circuit may be used
in either 12 or 24 Volt systems with only a few minor wiring changes. This device
has been used to control the brightness of an automotive tail lamp and as a motor
speed control for small DC fans of the type used in computer power
supplies.
.(This circuit was featured in an article in Home Power Magazine #75) |
|
PWM Motor/Light Controller - These two schematics are variations on another
PWM circuit that I designed. 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,....(electronic circuit added 4/05) |
|
PWM Speed Control - includes theory and some example circuits (added 6/06) |
|
Quartz Crystal Based Remote Thermometer Features Direct Celsius Readout -
03/17/05, EDN-Design Ideas: (design idea added 5/05) 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 resistanceor semiconductor-based
sensors,... |
|
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) |
