|
C-52 EVB Robot Controller: (electronic circuit added 4/05) |
|
Camera Remote Control System using Basic Stamp: (electronic circuit added 4/05) |
|
Cascaded UnManaged
Repeater Applications: National Semiconductor Application Note (app note added 6/06) |
|
Ceiling Fanspeed Control : (electronic schematic / circuit added 2/05) |
|
Circuit Automates Switch over between Battery and Source: 12/12/97 EDN-Design Ideas / (added 3/03) |
|
Circuit Controls Brightness of Multiple Displays: 05/30/02 EDN Design Ideas / (added 6/06) I recently needed to control nine seven-segment displays for a
microcontroller's serial port. The complication I faced was the need to provide a continuous brightness adjustment for all the digits—from completely dark to fully bright. I couldn't easily
use the obvious solution of a string of 74HC595 serial-to-parallel converters driving the segments through series resistors, because I wou.... |
|
Circuit Controls intensity of reflex optical sights: 02/21/02 EDN Design Ideas / (added 1/05) A popular category of aiming/pointing aids is the reflex, or
"red-dot," sight. This system finds use in such diverse applications as astronomy, archery, and shooting. In the reflex sight, light from an internal source-typically a high-intensity red
LED-reflects from a curved, transparent optical (reflex) element through which you view the target. ... |
|
Circuit Controls Isolated 12 Volt Stepper Motor: 09/26/96 EDN-Design Ideas / (added 6/06) -Allows full
direction and step control of a12V, four-phase stepper motor from a5V, TTL/CMOS-compatible logic controller |
|
Circuit Controls Microneedle Etching: 11/27/03 EDN Design Ideas / (added 1/05) At its invention roughly two decades ago, STM (scanning tunneling microscopy) created
a sensation because it was the first technology to make atomic-scale-resolution imaging a routine procedure. An essential requirement for the practical application of STM is some means for the
reproducible fabrication of supersharp, atomic-scale needle tips.... |
|
Circuit Controls Multiple Thermoelectric Coolers: 08/19/99 EDN-Design Ideas / (added 2/06) Optoelectronic and other components sometimes use a thermoelectric cooler and a
thermistor for temperature control. A typical thermoelectric cooler has 1A maximum current and 1µ impedance. These parameters make simple series-pass drive circuits inefficient, given the
typical available supply voltages (5, 12, or 15V). Often, several thermoelectric coolers exist in a single circuit (for example, a multiple-wavelength optical transmitter). In this case, you
can obtain improved efficiency by using the circuit in Figure 1. This circuit has three devices to cool, so it contains three coolers and three thermistors. On the sensor side, each thermistor
connects to a standard proportional-integral-differential op-amp or µP-based-controller circuit. Each controller produces a command voltage that is proportional to the current its respective
cooler requires.... |
|
Circuit Controls Ratiometric or Simultaneous Power Up of Multiple Rails: 05/13/04 EDN Design Ideas / (added 1/05) Many applications use FPGAs, AS ICs, or DSP chips,
which usually require multiple voltage rails, typically two: the core voltage and the I/O voltage. The core voltage is usually lower than the I/O voltage. Guidelines for determining how to
power up two or more voltage rails depend on the part and the manufacturer you use.... |
|
Circuit Controls Slew for Stepper Drive: 03/14/97 EDN-Design Ideas / (added 6/06) The circuit in Figure 1 provides slewing
control for stepper motors that you use in sophisticated applications, such as monochromator movements in optical experiments. The LM331 VFC plays a vital role in this circuit. The constant
10V dc from the IC9596 voltage reference routes to the VFC through the DG303 CMOS switch. The DG303's configuration is such that the VFC initially receives 0V through the grounded 33-kilohms
resistor. When the Inhibit pin goes high,... |
|
Circuit Controls Stepper Motors: 01/08/04 EDN Design Ideas / (added 1/05) Stepper motors are useful in many consumer, industrial, and military applications. Some,
such as personal-transportation systems, require precise speed control. Stepper-motor controllers can be simple (Figure 1), but they require a variable-frequency square wave for the clock
input. The AD9833 low-power DDS (direct-digital-synthesis) IC with an on-chip, 10-bit DAC is ideal for this task, becaus...... |
|
Circuit Disconnects Load from Low Voltage Supply: 04/24/03 EDN Design Ideas / (added 02/05) Power supplies often include a circuit that disconnects the load when
the supply voltage drops too low, such as when a battery is nearly discharged. A p-channel MOSFET connected between supply and load is the typical approach. However, a 1.5V single-cell battery
or other low-voltage supply is insufficient to fully turn on the MOSFET.... |
|
Circuit forms DC
Motor Switch with Brake: 01/10/02 EDN Design Ideas / (added 1/05) controlling a small dc motor without speed control sounds like a trivial task; a switch or a relay
should suffice. However, several problems accompany this approach. For one, the switch, because of the inductive load and the low starting resistance of the motor, tends to wear out
prematurely (with all the related sparks and EMI problems). ... |
|
Circuit Generates Fan Speed Control: 03/21/02 EDN Design Ideas / (added 1/05) Fan noise is becoming a significant issue as electronic equipment increasingly enters
the office and the home. Noise is proportional to fan speed, and the airflow hence, fan speed necessary for cooling is less at low ambient temperatures. Because ambient temperature is lower
than the upper design point most of the time, a fan can run slower, making it easier on the ears. ... |
|
Circuit Manages Power Up Sequencing: 10/31/02 EDN Design Ideas / (added 1/05) Power sequencing poses a unique problem in power management. Because improper
sequencing may cause damage to many types of processors, power-up sequencing of these devices is critical. Devices that may require power-up sequencing control include FPGAs, AS ICs, and DSP
chips. These devices can require tracking I/O and core voltages.... |
|
Circuit Measures Currents in DC Servo Motor: 12/06/01 EDN Design Ideas / (added 1/05) The simple circuit design in Figure 1 lets you measure all components of a
current flowing in a dc servo motor. The rectified output of the circuit uses ground as a reference, so you can measure the output by using a single-ended A/D converter. The current-sense
resistor, R1, has a value of 0. ... |
|
Circuit Protects System from Overheating: 11/08/01 EDN Design Ideas / (added 1/05) The two-chip circuit in Figure 1 provides fan control and overtemperature warning
and shutdown signals to protect systems from excessive heat. The circuit monitors the temperature of the pc board and the die temperature of a CPU, an FPGA, or another IC with an on-chip
temperature-sensing transistor. ... |
|
Circuit Provides Bidirectional Variable Speed Motor Control: 05/16/02 EDN Design Ideas / (schematic / circuit added 11/03) During the development of systems
that include small motors, a simple, bidirectional motor controller with speed adjustment may be helpful. Figure 1 shows such a controller. The circuit uses everyday components whose
tolerances and ratings are unimportant as long as they sustain the required voltage, current, and power.. |
|
Circuit provides brownout control of 80C31: 08/19/99 EDN-Design Ideas / (added 2/06) |
|
Circuit Provides Class D Motor Control: 05/01/03 EDN Design Ideas / (added 1/05) Class D audio amplifiers provide a dual benefit for battery-powered portable
devices. They enhance battery life, and they produce much less power dissipation than do their linear cousins. Those features make Class D amplifiers ideal candidates for controlling speed and
direction in small electric motors.... |
|
Circuit provides efficient Fan speed Control: 03/04/04 EDN Design Ideas / (added 1/05) As Moore's Law plunges us into the realm of multigigahertz processors and PCs
with gigabytes of RAM, engineers face the task of removing the heat that these state-of-the-art components produce. Cooling such systems poses a dilemma. If you optimize the fan size and speed
for nominal operating conditions, the system is susceptible to failure when conditions deteriorate.... |
|
Circuit Provides Laser Diode Control: 09/19/02 EDN Design Ideas / (added 1/05) Laser diodes are sensitive to ESD, rapid turn-on currents, and overvoltage
conditions. To address those problems, the simple laser-diode controller in Figure 1 has several functions. The first part of the circuit comprises an 8.2V zener diode, D1 that forms the heart
of a constant-voltage source for the laser diode.... |
|
Circuit Provides Motor Feed Control: 07)/25/02 EDN Design Ideas / (added 1/05) Because we needed a small grinding machine, we modified an old milling machine that
lacked a control system. The table of the grinding machine needed only to move back and forth with adjustable feed. Using an existing dc servoamplifier, a servo motor, and limit switches, we
devised the circuit shown in Figure 1.... |
|
Clap Activated Remote: (electronic circuit added 10/05) |
|
CLC030 or CLC031
Control Port Bussed Operation: National Semiconductor Application Note (app note added 6/06) |
|
Closed-Loop Control Circuit Implementation of the ADuC832 MicroConverter®IC and the AD8305 Logarithmic Converter in a Digital
Variable Optical Attenuator: AN-643 Analog Devices Application Notes (app note added 6/06) |
|
Closed-Loop FLow Control Manages ATM Channel Bandwidth: 11/21/96 EDN-Design Feature / (added 11/05) Building Using
closed-loop flow control, you can keep the ATM data pipe wide as well as manage it efficiently. A primer in closed-loop flow control and the related ICs will help you to implement this control
scheme in your next ATM design.—David Copeland, Texas Instruments Inc..... |
|
CMOS Gate Implements Reverse Phase Control: 05/21/98 EDN-Design Ideas / (added 3/03) |
|
CMOS Toggle Flip Flop With Relay(CD4013): (electronic circuit added 2/07) |
|
CO2 Controller for Planted Tanks: (schematic / circuit added 10/02) |
|
Combination Controlled Fully Customizable RF Remote Control: (schematic / circuit design added 08/05) |
|
Compact DWDM
laser Temperature Control with the MAX8521: App Note 3264: Maxim IC (application note added6/06) |
|
Comparator
Adds Current Limit to V2 Controller: 05/21/98 EDN-Design Ideas / (added 6/06) The subroutine "FASTBCD" (Listing 1) for 8051 µPs quickly converts 16-bit binary to 24-bit BCD data.
The conversion algorithm involves left-shifting bits from the high-order bit of the binary number into the carry bit while left-shifting the carry bits into the low-order bit of a BCD shift
register using BCD left-shift operations. .... |
|
Computer Controlled Model Train Set: (circuit / schematic design added 6/06) |
|
Computerized Infrared Remote: control your stereo, TV and VCR from Windows, includes schematic and software (added 4/02) |
|
Configuring the AD7877: AN-753 Analog Devices Application Notes (app note added 2/06) |
|
Constant Temperature Circuit: (schematic / circuit design added 9/02) |
|
Control 120VAC relay with TTL : ASCII format (circuit design added 7/06) |
|
Control 120VAC relay with TTL: (diagram added 2/07) |
|
Control 32 DAC Channels via a Parallel Port: 07)/08/99 EDN Design Ideas / (added 6/06) [Note: File contains multiple circuits. Scroll to find this one.]
Occasionally, a system needs several digitally programmable voltage-output channels. Such output channels typically provide the control for robot positioning, industrial processes, and even
home automation. The circuit in Figure 1 controls 32 voltage-output channels from the parallel port of a PC. The circuit comprises eight DAC7615 quad voltage-output, serial-data programmable,
12-bit DACs. The controlling PC individually programs each of the 32 DAC channels, and all DAC outputs simultaneously update.... |
|
Control a Processor's Power Supply in Real Time: 03/31/05 EDN Design Ideas / (added 6/06) Dynamic control of
processor's supply rail minimizes power consumption. |
|
Control Applications
of CMOS DACs: National Semiconductor Application Note (app note added 6/06) |
|
Control Electrical Appliances using PC: Here is a circuit for using the printer port of a PC, for control application using
software and some interface hardware. The interface circuit along with the given software can be used with the printer port of any PC for controlling up to eight equipment . The interface
circuit shown in the figure is drawn for only one device, being controlled by D0 bit at pin 2.... (added 06/06) |
|
Control Electrical Appliances using PC: Here is a circuit for using the printer port of a PC, for control application using
software and some interface hardware. The interface circuit along with the given software can be used with the printer port of any PC for controlling up to eight equipment . The interface
circuit shown in the figure is drawn for only one device, being controlled by D0 bit at pin 2.... (added 06/06) |
|
Controller Easily Evaluates 2-Bit Gray Code : 06/19/97 EDN-Design Ideas / (added 2/06) |
|
Controller IC
and One Shot Form Resonant Controller: 11/28/02 EDN Design Ideas / (added 1/05) Resonant power supplies are popular because of high efficiency, low noise, and
compactness. You can implement a resonant buck or boost converter using a single switch. The regulation of the output in such a converter derives from using a constant on or off time and a
variable frequency. The UC1864 controller IC (Texas Instruments, www.... |
|
Controller Provides Closed Loop Temperature Regulation: 05/08/97 EDN-Design Ideas / (added 3/03) |
|
Controller Provides Constant Power DC Load: 03/14/96 EDN-Design Ideas / (added 3/03) |
|
Controller Provides Multimode Phase Control: 12/12/97 EDN-Design Ideas / (added 6/06) --16C508 multichip
controller, you can implement a phase controller that provides a two-key, indexed processor for ac power |
|
Controller
Provides Multiple Alarm Driver Formats: 01/15/98 EDN-Design Ideas / (added 08/05) DC/DC converters for use inside the telephone handset require operation from the
high-source-impedance phone line. Additionally, the CCITT specifications call for maximum on-hook power consumption of 25 mA. The dc/dc converter in Figure 1 is 70%-efficient at an input power
of 25 mA, providing 5V at 3.4 mA. Controlled, low-peak switch current ensures that the 48V input line experiences no excessive voltage drops during switching. |
|
Controller Supports Differential Monitor Display: 06/24/99 EDN-Design Ideas (added 2/06) |
|
Controlling a Light with Two Switches: a light or lights can be controlled by more than1-switch (added 5/03) |
|
Controlling a Variable Voltage Power Supply using the DS1809 (Pushbutton Control): Maxim Application Note #1035 (app note
added 6/06) |
|
Controlling Relays with Logic Voltages: (circuit / schematic added 5/03) |
|
Controlling Slew Times Tames EMI in Offline Supplies: 11/14/02 EDN Design Ideas / (added 1/05) EMI from offline switching power supplies typically causes all sorts
of problems for power-supply designers. You may need a large EMI filter to meet FCC emission requirements. Switchers for high efficiency produce high-frequency switching noise that can
propagate through the rest of the system and cause problems.... |
|
Controlling TDMA Timeslot Power Levels using the Esg-D Series, RF Signal Generators: Aligent Application Note (added
6/06) |
|
Correct Voltage Drop and Phase Shift in Transmission Lines: 03/20/03 EDN-Design Ideas / (schematic / circuit added 11/03) Many precision test-and-measurement and high-speed
analog applications require an exact targeted voltage to be delivered to the device under test or intended load to accurately analyze the device. Design and test engineers are well-aware that
this goal is sometimes unattainable, because the impedance across the traces delivering the signal to the load alters the original signal... |
