|
Dark-Activated 230V Lamp - Compact circuitry using small-size parts only. Can
be wired in parallel to existing switches. (added 6/06) |
|
DC Motor Brake - When the power switch is closed, the gate voltage of Q1 turns
Q1 on. The drain of Q1 swings low, turning off Q2. Current flows freely into the
DC motor with only one diode drop from D2. When the power switch is open. The
gate voltage of Q1 swings low, causing the drain of Q1 to swing high. This turns
on the transistor Q2. With Q2 on, the resistor R3 is switched in parallel with
the motor, producing a braking action. The value of R3 can be selected for the
desired braking action. A zero ohm resistance will produce the fastest slow down
of the motor. The circuit below is good for about 500ma of motor current. A Q2
transistor with a lower on resistance would be needed for bigger motors. Also, D2
would need to increase in size ….(designed by David A. Johnson) |
|
DC Motor Control Circuit - Here, S1 and S2 are normally open , push to close,
press button switches. The diodes can be red or green and are there only to
indicate direction. You may need to alter the TIP31 transistors depending on the
motor being used. Remember, running under load draws more current. This circuit
was built to operate a small motor used for opening and closing a pair of
curtains... (added 2/06) |
|
DC Motor Control using a Single Switch - (electronic Circuit / Schematic added
10/04) |
|
DC Motor Controller (jcmiras.net) - This DC Motor Controller circuit will
control a 12V dc motor. The system will have three pushbuttons: a START button, a
REVERSE button and a STOP button. Initially, the motor must not be running. When
the START button is pressed, the motor will run in one direction. (added 6/06) |
|
DC Motor Driver with L6203 - (electronic circuit added 4/05) |
|
DC Motor Model - Although SPICE does not provide explicit models for
electro-mechanical devices, like a DC motor, creating one is fairly
straightforward. You just need to remember that most physical behaviors, whether
mechanical or electrical, can be described by a set of equations. So for a desired
...(spice design added 02/09) |
|
DC Motor Pulse Width Modulation 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. (electronic diagram added 10/06) |
|
DC Motor Reversing Circuit (Andy Collinson) - A DC motor reversing circuit
using non latching push button switches. Relays control forward, stop and reverse
action, and the motor cannot be switched from forward to reverse unless the stop
switch is pressed first. (added 4/02) |
|
DC motor speed controller -Scroll down to find link to circuit drawing and
circuit explanation….(electronic schematic added 09/06) |
|
DC Motor-Driver H-Bridge Circuit - Physical motion of some form helps
differentiate a robot from a computer. It would be nice if a motor could be
attached directly to a chip that controlled the movement. But, most chips can't
pass enough current or voltage to spin a motor. Also, motors tend to be
electrically noisy (spikes) and can slam power back....(schematic added 03/04/05) |
|
DC Motor-Driver H-Bridge Circuit circuitdb - Physical motion of some form
helps differentiate a .... (added 2/07)t from a computer. It would be nice if a
motor could be attached directly to a chip that controlled the movement. But, most
chips can't pass... |
|
DC Push Button Motor Control Circuit - (circuit / schematic design added 6/06) |
|
DC servo motor driver - ….(circuit design added 08/08) |
|
DC Servomotor Controller - An experiment on the DC servomotor control system.
It is controlled with only an AVR. (added 6/06) |
|
Debouncing Networks Make Reliable Selector - 06/05/97, EDN-Design Ideas:
(design idea added 3/03) |
|
Debugging an MCU-based CCD camera controller - Agilent Application Note (app
note added 6/06) |
|
Decoding Infrared Remote Controls - ASCII format (circuit added 7/02) |
|
Delayed shutter control for Kodak DC-20 - A review of diode-based limiter
design. Includes discussion of hard and soft limiters, the differences between
diode types as clipping elements, variable limiters and multiband limiters.
Designed by HeadWize Design Paper (circuit design added 04/05/06) |
|
Desktop Power Supply - (application / block diagram added 6/07) |
|
Desktop Power Supply Clone Market - (application / block diagram added 6/07) |
|
Device Control using DTMF - Controlling devices using switches are common.
From a few decades controlling devices using remote control switches like infrared
remote control switch, wireless remote control switches, light activated switches
are becoming popular. But these technologies have their own limitations. Laser
beams are harmful to mankind. ….(circuit design added 11/08) |
|
Digi Pack DMX 512 Lighting Controller - (electronic circuit added 4/05) |
|
Digital Automatic Gain Control AGC - (electronic circuit added 7/03) |
|
Digital controller compensates analog controller - 02/19/09, EDN-Design
Ideas: - Combine the simple and robust closed-loop control of the digital
CLZD010 with the current-limited high-side gate drive of the analog LM3485 for the
best of the digital and analog worlds.....(design idea added 08/09) |
|
Digital Speed Control - Digital Speed Control with aSwitching rate of 15KHz
(circuit added 10/06) |
|
Digital Speed Control for RC Car - DC motor PWM controller that takes the1ms
to2ms pulse from the RC receiver and converts it into a PWM train at1Khz (added
6/06) |
|
Digital Speed Control with Reverse - (Schematic added 10/06) |
|
Digital Thermostat with LED Temperature Display - I needed to replace two old,
unreliable thermostats for controlling the heating and cooling for a large garden
shed. Commercial basic digital thermostats are available quite cheaply, but some
lack the ability to control heavy loads or have the extra features that I require
for saving energy when the door is often left open or to indicate temperature
being out of range etc. I like the PIC18F1320 microcontroller used in my previous
project - so decided to use it again in a very similar design to drive three
multiplexed LED displays and read the temperature from a Dallas/Maxim DS18x20
"1-Wire" digital sensor. ….(design added 11/08) |
|
Digital Volume Control - Circuit of a digital volume control using six
discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to
function as astable flip-flop. Its frequency or period may be adjusted by proper
choice of resistors R44, R45 and capacitor C6 combination. Here it is for 0.3
second period.….(design added 08/08) |
|
Digital Volume Control has Log Taper - 04/11/02, EDN-Design Ideas: Digital
potentiometers provide a compact and convenient way to attenuate audio-amplifier
signals. However, most such potentiometers suffer from at least one flaw: a
nonlogarithmic step increment. To avoid this problem, a user must usually step the
potentiometer in a nonlinear sequence to simulate a logarithmic taper.....(design
idea added 1/05) |
|
Digitally Addressable DALI Dimming Ballast - (circuit / schematic design added
6/06) |
|
Digitally Addressable DALI Dimming Ballast App. - Microchip Application Note
Published 10-Apr-02 (app note added 6/06) |
|
Digitally control room light intensity - 11/11/04, EDN-Design Ideas: Many
people favor different light and temperature settings for different rooms
depending upon their mood or whether they are working or relaxing. The circuit in
Figure 1 controls the intensity of the artificial light in a room and monitors the
temperature of two zones. The two main circuit blocks are the PIC16C67 master
controller and the ADT7516 temperature-sensor interface, which includes
a.....(design idea added 11/04) |
|
Digital-Volume Control - This circuit could be used for replacing your manual
volume control in a stereo amplifier. In this circuit, push-to-on switch S1
controls the forward (volume increase) operation of both channels while a similar
switch S2 controls reverse (volume decrease) operation of both channels.….(design
added 08/08) |
|
Dimension Control - Add an effective New Dimension to your Stereo
soundIncrease Seperation and Reduce Noise....(circuit design added 12/08) |
|
Dimmer Circuit for Normal Light Bulbs - (schematic / circuit design added
9/02) |
|
Dimmer/Motor Speed Control - Lamp dimmers using traics can be quite simple,
nothing more than a potentiometer, resistor, capacitor and triac with a built-in
diac. (See Teccor's application note for examples and other technical data.) The
circuit below is similar....(electronic circuit added 7/03) |
|
Disco Light Controller - (circuit / schematic design added 6/06) |
|
DIY remote control based on PIC - Control up to 8 devices by this easy
constructable remote control. It can work as a radio or infrared remote control,
depending on the components. Each device output can be configured to be momentary
(turned on while you press the button) or latched. Latched outputs can be toggled
on/off by one button per channel, or turned on and off by two buttons per
channel….(electronic schematic / circuit added 4/02) |
|
DMOS 3A, 55V, H-Bridge - National Semiconductor Application Note (app note
added 6/06) |
|
Dog Detector for a Dog 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) |
|
Dome Lamp Dimmer - This unique circuit makes your dome light look cool.
Usually when the car door is closed, the dome light just goes OFF. With this
circuit, you can have our dome light fade slowly….(electronic circuit added 7/03) |
|
Door Mirror Controller - As for the recent car, the door mirror is popular
thing and the electromotion housing type is used usually. Even my car is a door
mirror type, but the electromotion housing function was not attached.….(added
04/05/06) |
|
Dremel Speed - The circuit at right uses a logi-level N-channel FET driven
directly by the PIC. The PIC creates a variable PWM signal to power the motor.
Motor current is sensed using a combined 0.5 ohm resitance to ground. Since this
….(circuit design added 08/08) |
|
Dual Channel Servo Pulse to H-Bridge Interface - (circuit / schematic design
added 7/06) |
|
Dual Channel Servo Pulse to H-Bridge Interface ~mixos - (electronic circuit
added 2/07) |
|
Dual DC Motor Speed Controllers Navigate Robots - 03/29/01, EDN-Design Ideas:
/ Mobile robots need simple and lightweight dc-motor-speed-control hardware that
can work with low-power batteries. Flip-flop type navigation systems allow only
one motor to operate at a time while the other motor remains off. Navigation
direction changes alternatively even when the robot has to navigate through a
straight path. Line-tracker robots are of this type. (added 2/06) |
|
Dual Fan Controller - A birthday present gone too far. An overengineered
temperature-based automatic twin fan controller with brass face to keep a kitchen
PC cool. (project added 10/06) |
|
Dual Polarity Amplifier has Digital Control - 09/12/96, EDN-Design Ideas:
(design idea added 2/05) |
|
Dual Slope-Sampling Solar Engine - Voltage-Controlled Solar Engine: The dual
slope sensing SE is another Wilf Rigter design; this SE is optimized for 'bots
with a low-power standby mode. (added 6/06) |
|
Economical 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....(circuit added 09/08) |
|
Eight Channel Eight Bit PWM Controller - National Semiconductor Application
Note (app note added 6/06) |
|
Eight Way Switcher - (Schematic / Circuit added 10/06) |
|
Electric Curtains Control - This hybrid circuit uses a mixture of transistors,
an IC and a relay and is used to automatically open or close a pair of curtains.
Using switch S3 also allows manual control, allowing for curtains to be left only
partially open or closed. The circuit controls a motor which is attached to a
simple pulley mechanism, to move the curtains. I first started this circuit over
20 ....(added 11/05) |
|
Electric Power Controller - suitable as dimmer for100-Volt lamp up to1200W
(app note added 6/06) |
|
Electrical Equipment Control using PC - (electronic Circuit / Schematic added
10/04) |
|
Electronic Church Bell Controller - 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) |
|
Electronic Fluorescent Lamp Ballast - International Rectifier application note
in PDF format (added 4/02) |
|
Electronic Keypad - (electronic design added 9/02) |
|
Electronic Motor Starter - (circuit / schematic design added 6/06) |
|
Electronic SPDT controls two PC's - 09/02/99, EDN-Design Ideas: (design idea
added 2/06) |
|
Electronic Speed Controller for R/C Models - Here's how you can make an
electronic speed controler (ESC) for your remote control car, boat or even an
airplane using an old servo and some MOSFETS…. (electronic design added 10/06) |
|
Electronic Thermostat Relay Circuit - Here is a simple thermostat circuit that
can be used to control a relay and supply power to a small space heater through
the relay contacts. The relay contacts should be rated above the current
requirements for the heater. Temperature changes are detected by a (1.7K @ 70F)
thermistor placed in series with a 5K potentiometer which produces
about....(electronic schematic / circuit added 4/02) |
|
Emergency Backup Lamp - This back-up lamp stays off as long as light falls on
the CdS photocell from either the NE-2 or from room ambient light. So, if the
power fails at night, the lamp will light. The 6 volt lamp should be directed away
from the photocell....(electronic circuit added 7/03) |
|
Encoder and PC Make Complete Motor Control System - 12/12/02, EDN-Design
Ideas: This Design Idea combines a simple ISA-bus-resident interface circuit; a
garden-variety PC; a high-resolution optical shaft encoder; and a PWM-controlled,
0.05-hp, brushed, permanent-magnet dc motor to make a high-precision and
high-power motion-control system. The system sequences the precise rotation of an
evacuated steel bell jar.....(design idea added 1/05) |
|
Energy Management Control System - Microchip Application Note Published
26-Aug-97 (app note added 2/06) |
|
Engine Control Unit Schematics - (diagram added 6/03) |
|
Ethernet Controller - ….(electronic schematic added 08/08) |
