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Control
Circuits Page 2
Control Circuits:
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Last Updated on:
Friday, October 16, 2009 03:41 AM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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C# application controls simple ADC - 10/30/08, EDN-Design Ideas: - Control a
simple, low-cost ADC with a PC's serial port.....(design idea added 08/09) |
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C-52 EVB Robot Controller - Use a C-52 EVB for simple robot experiments. Build a
simple two wheels robot with L293 H-Bridge driver and IR sensor. Write a C program
controls robot tracked with black tape. (electronic circuit added 4/05) |
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Camera Remote Control System using Basic Stamp - (electronic circuit added 4/05) |
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CAN Node Using The Mcp2510 And Pic12c67x - Microchip Application Note Published
24-Feb-03 (app note added 6/06) |
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Cascaded UnManaged Repeater Applications - National Semiconductor Application
Note (app note added 6/06) |
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Cat Detector for a Cat Flap on a door. - This circuit uses one tuned coil for on
the door and just a single wire loop on the animals collar. When the two coils come
close together, it produces a signal that can cause a an LED to light and also trips a
solenoid to unlock the door so it can open. Since all these doors are somewhat
different, I leave ….(circuit design added 3/08) |
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Ceiling Fanspeed Control - (electronic schematic / circuit added 2/05) |
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CFL Ballast for 26w/ Sprial Lamp 220Vac Input - The IRPLCFL5E reference design is
an electronic ballast for driving 26W compact fluorescent lamps from 220VAC. The
circuit provides all of necessary functions for preheat, ignition and onstate
operation of lamp and also includes EMI filter and rectification stage. The circuit
is built around IR2520D Ballast Control IC. (added 3/05) |
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Charge Coupled Bi-Directional Power Mosfet Relay - The circuit uses an inexpensive
C-MOS inverter package and a few small capacitors to drive two power MOS transistors
from a 12v to 15v supply. Since the coupling capacitor values used to drive the FETs
are small, the leakage current from the power line into the control circuit is a tiny
4uA. Only about 1.5mA of DC is needed to turn on and off 400 watts of AC or DC power
to a load. Published in Electronic Design, Nov. 8, 1990. ….(designed by David A.
Johnson) |
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Church Bell Controller (Antonis Pontikakis) - This circuit is a church bell
controller. Basic component is an ATmega32 microcontroller. At the circuit 2 24LC32
eeprom memories is being used, the 1st for internal standard melodies and the 2nd one
is for user's compositions. This feature will be provided in the future. .….(circuit
design added 08/08) |
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Circuit Automates Switch over between Battery and Source - 12/12/97, EDN-Design
Ideas: (design idea added 3/03) |
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Circuit Controls Brightness of Multiple Displays - 05/30/02, EDN-Design Ideas:
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.....(design idea added 6/06) |
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Circuit Controls intensity of reflex optical sights - 02/21/02, EDN-Design Ideas:
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.....(design idea added 1/05) |
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Circuit Controls Isolated 12 Volt Stepper Motor - 09/26/96, EDN-Design Ideas:
-Allows full direction and step control of a12V, four-phase stepper motor from a5V,
TTL/CMOS-compatible logic controller.....(design idea added 6/06) |
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Circuit Controls Microneedle Etching - 11/27/03, EDN-Design Ideas: 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.....(design idea added 1/05) |
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Circuit Controls Multiple Thermoelectric Coolers - 08/19/99, EDN-Design Ideas:
Optoelectronic and other components sometimes use a thermoelectric cooler and a
thermistor for temperature control. A typical thermoelectric cooler.....(design idea
added 2/06) |
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Circuit Controls Ratiometric or Simultaneous Power Up of Multiple Rails -
05/13/04, EDN-Design Ideas: 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.....(design idea added 1/05) |
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Circuit Controls Slew for Stepper Drive - 03/14/97, EDN-Design Ideas: 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.....(design idea added 6/06) |
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Circuit Controls Stepper Motors - 01/08/04, EDN-Design Ideas: 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.....(design idea added 1/05) |
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Circuit delivers dimming control for white LED driver - 10/28/04, EDN-Design
Ideas: The demand for power in color cell-phone handsets is constantly increasing.
New applications steadily emerge, making it imperative to reduce power consumption in
the design. Examination of usage data shows that more than 50% of the power consumed
is in providing backlighting for the color screen. People use the phones for playing
games and MP-3s and a multitude of other heavy-duty, multimedia f.....(design idea
added 11/04) |
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Circuit Disconnects Load from Low Voltage Supply - 04/24/03, EDN-Design Ideas:
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.....(design
idea added 12/04) |
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Circuit forms DC Motor Switch with Brake - 01/10/02, EDN-Design Ideas:
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).....(design idea added 1/05) |
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Circuit Generates Fan Speed Control - 03/21/02, EDN-Design Ideas: 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,.....(design idea added 1/05) |
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Circuit Manages Power Up Sequencing - 10/31/02, EDN-Design Ideas: 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.....(design
idea added 1/05) |
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Circuit Measures Currents in DC Servo Motor - 12/06/01, EDN-Design Ideas: 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 of0.....(design idea added 1/05) |
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Circuit Protects System from Overheating - 11/08/01, EDN-Design Ideas: 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.....(design idea added 1/05) |
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Circuit Provides Bidirectional Variable Speed Motor Control - 05/16/02, EDN-Design
Ideas: 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.. /
(schematic / circuit added 11/03) |
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Circuit provides brownout control of 80C31 - 08/19/99, EDN-Design Ideas: (design
idea added 2/06) |
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Circuit Provides Class D Motor Control - 05/01/03, EDN-Design Ideas: 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.....(design idea added 1/05) |
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Circuit Provides Efficient Fan Speed Control - 03/04/04, EDN-Design Ideas: 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.....(design idea added 1/05) |
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Circuit Provides Laser Diode Control - 09/19/02, EDN-Design Ideas: 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.....(design idea added 1/05) |
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Circuit Provides Motor Feed Control - 07/25/02, EDN-Design Ideas: 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.....(design idea
added 1/05) |
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Circuit Removes Relay Contact Bounce - 11/27/03, EDN-Design Ideas: Advances
in semiconductor technology have allowed ICs to replace many mechanical relays,
but relays still dominate in high-current circuits that must stand off high
voltages of arbitrary polarity. Contact bounce in those relays, however, can prove
troublesome to downstream circuitry. One approach to contact bounce combines a
relay with a hot-swap controller.....(design idea added 1/05) |
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Circuit Simulates Contact Bounce - 05/08/97, EDN-Design Ideas: (design idea
added 2/06) |
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Clap Activated Remote - (electronic circuit added 10/05) |
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CLC030 or CLC031 Control Port Bussed Operation - National Semiconductor
Application Note (app note added 6/06) |
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Closed Loop FLow Control Manages ATM Channel Bandwidth - 11/21/96, EDN-Design
Feature.....(design idea 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.... |
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CMOS Gate Implements Reverse Phase Control - 05/21/98, EDN-Design Ideas:
[Note: File contains multiple circuits scroll to find this circuit] 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.....(design idea added 2/06) |
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CMOS NAND gates control sump pump - 05/14/09, EDN- Design Ideas - A similar
circuit lets you control both the sump pump and the water level.....(design idea
added 08/09) |
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CMOS Toggle Flip Flop With RelayCD4013 - The circuit below uses a CMOS dual D
flip flop (CD4013) to toggle a relay or other load with a momentary push button.
Several push buttons can be wired in parallel to control the relay from
multiple.... (electronic circuit added 2/07) |
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CO2 controller for planted tanks - (schematic / circuit added 10/02) |
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Combination Controlled Fully Customizable RF Remote Control - (schematic /
circuit design added 08/05) |
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Comparator Adds Current Limit to V2 Controller - 05/21/98, EDN-Design Ideas:
(added 01/05) |
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Component Video Filtering Using the ML6420/ML6421 / AN-42035 - Fairchild
Application Notes / (app note added 6/06) |
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Computer Controlled Model Train Set - (circuit / schematic design added 6/06) |
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Computerized Infrared Remote - control your stereo, TV and VCR from Windows,
includes schematic and software (added 4/02) |
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Configuring the AD7877 - AN-753 Analog Devices Application Notes (app note
added 2/06) |
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Constant Temperature Circuit - This circuit is a generic low power temperature
controller that can be used for stabilizing temperature sensitive electronic
circuits. It was built to stabilize a radio frequency VFO (Variable Frequency
Oscillator) for ham radio applications. The circuit has also been used to lower
the drift of a Ramsey FM10a micropower FM transmitter.....(schematic / circuit
design added 9/02) |
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Consumer STB/DVD - (application / block diagram added 6/07) |
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Continuity Tester - This is another invaluable piece of test equipment for
digital work. It has been designed by us to cater for a particular
application….(electronic circuit added 05/06) |
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Continuity Tester (Tony van Roon) - Starting with a 9 volt supply, when the
probes are shortcircuited there is a 8.2 volt drop across the zener diode Z1
leaving a maximum of 0.8 volt across R1. Application of Ohms' Law showse
....(circuit added 04/05/06) |
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Control 120VAC relay with TTL - ASCII format (circuit design added 7/06)
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Control 32 DAC Channels via a Parallel Port - 07/08/99, EDN-Design Ideas:
[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.....(design idea added 6/06) |
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Control a Processor's Power Supply in Real Time - 03/31/05, EDN-Design Ideas:
(design idea added 6/06) Dynamic control of processor's supply rail minimizes
power consumption. |
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Control and Interfacing - (electronic design added 6/07) |
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Control Applications of CMOS DACs - National Semiconductor Application Note
(app note added 6/06) |
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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 04/05/06) |
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Control stepping motor via USB interface - This is an example that
demonstration how to control some devices via USB interface.The PC software
program with delphi. Feature: - CPU PIC18F4550 with full speed USB interface at
48MHz. - USB 2.0 compliance - Use on-chip USB driver ...(schematic added 7/08) |
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Controller Easily Evaluates 2 Bit Gray Code - 06/19/97, EDN-Design Ideas:
(design idea added 2/06) |
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Controller IC and one shot form resonant Controller - 11/28/02, EDN-Design
Ideas: 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.....(design idea added 12/04) |
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Controller Provides Closed Loop Temperature Regulation - 05/08/97, EDN-Design
Ideas: (design idea added 3/03) |
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Controller Provides Constant Power DC Load - 03/14/96, EDN-Design Ideas:
(design idea added 3/03) |
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Controller Provides Multiple Alarm Driver Formats - 01/15/98, EDN-Design
Ideas: 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.....(design idea added 06/06/06) |
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Controller Supports Differential Monitor Display - 06/24/99, EDN-Design
Ideas: (added 2/06) |
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Controlling 3-Phase AC Induction Motors using the PIC18F4431 - Microchip
Application Note Published 29-Jun-04 (app note added 2/06) |
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Controlling a Light with Two Switches - a light or lights can be controlled by
more than1-switch (added 5/03) |
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Controlling a Variable Voltage Power Supply using the DS1809 Pushbutton Control
- Maxim Application Note #1035 (app note added 5/08) |
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Controlling Relays with Logic Voltages - (circuit / schematic added 5/03) |
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Controlling Slew Times Tames EMI in Offline Supplies - 11/14/02, EDN-Design
Ideas: 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.... (added 12/04) |
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Controlling TDMA Timeslot Power Levels using the Esg-D Series, RF Signal
Generators - Aligent Application Note (added 6/06) |
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Correct Voltage Drop and Phase Shift in Transmission Lines - 03/20/03, EDN-Design
Ideas: 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.....(design idea added 1/05) |
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Courtesy Light - 15 seconds delayed switch-off for220-Volt AC lamp, a good
idea for bedroom lamps (added 11/06) |
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Control Circuits:
#-B
C
D-G
H-I
J-O
P-Q
R
S
T
U-V
W-Z |
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