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Joy Stick Controlled Modernized Toy Throttle: (circuit / schematic design added 6/06) |
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Keys to Longer Life for CMOS: AN-349 Analog Devices Application Note (app note added 3/06) |
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Layout and Grounding Recommendations for Touch Screen Digitizers: AN-577 Analog Devices Application Notes (app note
added 2/06) |
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LED Driver provides software Controlled intensity: 09/30/04 EDN Design Ideas / (added 6/06) Recent
advances in operating efficiency have expanded the use of LEDs from one of mere indicators to becoming driving forces in electronic lighting. Increased reliability and ruggedness (versus other
lighting technologies) gives the LED a bright future indeed. Vendors in recent years have introduced many ICs for driving LEDs, but the problem of driving serial chains of LEDs has received
less at...... |
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Leslie Speaker controller: Very basic but viable Leslie Speaker controller. Includes noise-abatement components, to
ensure smooth, quiet Tremelo/Chorale transistions. (circuit design added 9/06) |
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Light Controlled Switch #2: output a control signal suitable for relay depending on the light level (added 5/02) |
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Light Organ for Car: flashes3 low voltage lights, operates at10-25-Volt voltage, in PDF format, text in Finnish (added
4/02) |
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Light Processor 434 Piano Touch Panel: circuit diagram in PDF format, check also power supply circuit diagram (added 4/02) |
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Line Following Robot: This is a tiny line following robot which can run on the desk. (added 10/05) |
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Linear Voltage Fan Speed Control using Microchip's TC64x Family (TC642, TC646, TC648): Microchip Application Note Published
27-Jul-04 (app note added 6/06) |
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Linux Infrared Remote Control (LIRC): (design circuit added 8/02) |
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LM5068-48V Hot Swap Controller: National Semiconductor Application Note (app note added 2/06) |
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Load Switcher Draws Only 6 µA: 07)/04/96 EDN-Design Ideas / (added 3/03) |
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Low Noise AC Amplifier has Digital Control of Gain and Bandwidth: 02/05/04 EDN Design Ideas / (added 1/05)
In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain.
It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth as narrow as possible to pass only the useful input-signal spectrum.... |
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Low Voltage Hot Swap Controller Ignores Backplane Noise and Surges: DN319 Design Notes (Linear Technology) (app note
added 1/06) |
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Low-Noise Low Drop-Out Regulator for Portable Equipment: AN-262 Analog Devices Application Note (app note added
6/06) |
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LT1166: Power Output Stage Automatic Bias System Control IC: DN126 Design Notes (Linear Technology) (app note added
1/06) |
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LT1575 Ultrafast Linear Controller Makes Fast Transient Response Power Supplies: AN69 Linear Technology AN69 describes
considerations for linear regulators based on the LT1575 UltraFastTM Linear Regulator controller. The LT1575 drives an external MOSFET pass transistor as an overdriven source follower. This
configuration results in an extremely high speed regulation loop which minimizes the need for output capacitors. Target applications are state of the art microprocessor core supplies which
exhibit large, high speed load transients while having very tight supply voltage tolerance requirements. The application note shows numerous examples of circuit implementations and offers
detailed discussions of design considerations. |
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LT1619: Tiny Boost Controller Provides Efficient Solutions for Low Voltage Inputs: DN255 Design Notes (Linear
Technology) (app note added 1/06) |
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LTC1645 Dual Channel Hot Swap Controller/Power Sequencer: DN217 Design Notes (Linear Technology) (app note added
2/06) |
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LTC1646: Power Supply Isolation Controller Simplifies Hot Swapping the CompactPCI Bus for 5V-/3.3V-Only Applications: DN253
Design Notes (Linear Technology) (app note added 2/06) |
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LX1720: High-Efficiency Class-D, Stereo Audio Amplifier Controller IC. Summary (AN-11): Application Note 11 from Microsem
(app note added 6/06) |
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Mains Clock Controller using AT89C2051 1: (circuit / schematic design added 6/06) |
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Mains Clock Controller using AT89C2051 2: 12/04/97 EDN-Design Ideas / (added 6/06) |
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Make a simple ramp generator for stepper motors: 04/04/02 EDN-Design Ideas / (added 6/06) Stepper motors are synchronous
motors that step at the pulse rate of the driving signal. For the motor to move quickly, the stepping rate must be fast. |
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Measure temperature in remote locations: 10/12/00 EDN-Design Ideas / (added 6/06) |
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Microcontroller or DSP Circuit Controls On/Off Function: 11/13/03 EDN Design Ideas / (added 1/05) In many
applications, a single on/off button switches the power supply on or off. Usually, the system switches off regardless of the processing function or workload the microcontroller or DSP circuit
is currently handling. The small circuit in Figure 1 is intended to make the microcontroller or DSP circuit the master over this on/off function.... |
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Microcontroller Produces Analog Output: 10/16/03 EDN Design Ideas / (added 1/05) A brushless dc motor
needs several voltage levels to control its speed: 0V to stop the motor, 5V to run it at maximum speed, and some voltages between these extremes to run it slower. When you use such a motor in
a system under microcontroller supervision, the microcontroller should generate all these voltages.... |
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Microcontroller Watches Controls AC Power: 06/22/95 EDN-Design Ideas -circuit allows an isolated microcontroller to both
sense and control ac power to an externally plugged-in device (added 3/03) |
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MIDI Controller Footpedal: (circuit / schematic design added 6/06) |
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Miniature high-rate speed control: A miniature high-rate speed control published in the newsletter published by Electric
Model Flyers' of Southwestern Ontario (diagram add |
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Miniature low-rate speed control: A miniature low-rate speed control published in the newsletter published by Electric
Model Flyers' of Southwestern Ontario (diagram added 10/06) |
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Minimize the Short Circuit Current Pulse in a Hot Swap Controller: 05/27/04 EDN Design Ideas / (added 02/05)
Because of internal circuit-breaker delay and limited MOS-gate pulldown current, many hot-swap controllers do not limit current during the first 10 to 50 microseconds following a shorted
output. The result can be a brief flow of several hundred amperes. A simple external circuit can counter this problem. |
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Modulated Constant Off-Time Control Mechanism (AN-9): Application Note 9 from Microsem (app note added 6/06) |
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MOSFET Switch Provides Efficient AC/DC Conversion: 02/17/00 EDN-Design Ideas / (schematic / circuit added 11/03) |
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Motor Control Scheme Yields Four Positions with Two Outputs: 02/07)/02 EDN Design Ideas / (added 1/05)
Figure 1 showshow to position a mechanical device into four discrete positions but with only two free outputs and one free input from the control system. The position depends on a set of cams
and four corresponding limit switches. The 24V-dc motor comes with a worm gear. Darlington transistors Q3 to Q6 and resistors R7 to R12 form an H-bridge that drives the dc motor, M. ... |
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Motor Speed Control: allows you to control the speed of an AC motor, for example an electric drill, designed for115-Volt AC
(added 4/05) |
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Motor Speed Controllers: (electronic circuit added 4/05) |
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Multidisplay LED Controller: Linear Technology LTC3205 (app note added 2/05) |
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Noise Filtering and the ADT7461: AN-699 Analog Devices Application Note (app note added 2/06) |
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Novel Circuit Controls AC Power: 01/07)/99 EDN-Design Ideas / (added 08/05) [Note: File contains multiple circuits scroll to find this circuit] The simple and inexpensive
power-control circuit in Figure 1 uses a readily available fan regulator with built-in phase control. Such fan regulators are limited to approximately 100W. The circuit in Figure 1 adds two
SCRs and a few components.... |
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Opto-coupled Servo Actuator: (Schematic / Circuit added 10/06) |
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Optoelectronic Position Control - App Note 2: Apex Microtechnology Corp App Note (added 6/06) |
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OptoElectronic position Control simplifies motor movements: 04/29/04 EDN Design Ideas /
(added 1/05) The optoelectronic technique for achieving position control provides an inexpensive, easyto-design method of achieving simple, repeatable movement using fixed index points
with linearor rotary-motion components. The simple, basic design in Figure 1 for sequential position control exploits the quick response time of a power op amp, working in tandem with a pair
of photodiodes.... |
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Otp µC Controls Boomer Amplifier: 03/18/99 EDN-Design Ideas / (added 5/03) Figure 1 shows a circuitthat uses a
one-time-programmable (OTP) µC in an unusual way. A COP8SGR7 µC uses digital signals to "bit-bang" an LM4835 (dubbed "Boomer" by National) amplifier. Although the amplifier is designed for
potentiometer control, you can modify it to make it a fully digitally controlled part. Figure 2 shows the flow chart for the control process. A PWM signal and a lowpass filter allow you to use
digital signals to control the amplifier. The technique sets the µC in processor-independent mode. You load the values affecting the duty cycle into the appropriate timer registers. When a
control bit goes high, the µC delivers a PWM signal.... |
