Author - W. Stephen Woodward

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W. Stephen Woodward	Write for Electronic Design
Independent consultant Email address: eecon@email.unc.edu
62 results found for W. Stephen Woodward, displaying items 1 - 20

October 28, 2002 [Ideas For Design]
Hyperbaric Fall-Time Viscometer Is PC-Based
The measurement of the viscosity of solutions is an integral element in analytical chemistry and chemical manufacturing. It has particular value in designing and controlling the processes of polymerization, an essential step in the production of...

July 22, 2002 [Ideas For Design]
PC And Long-Baseline Chronography Measure Ballistic Parameters Acoustically
Ballistics is an ancient art—one that was already old when longbows, catapults, and bronze smoothbore cannons were the high-tech missile projectors of their respective day. "External" ballistics undertakes the prediction of the trajectory of the...

April 29, 2002 [Ideas For Design]
PC-Controlled Current Source Supplies 100-V, 1-A, 16-Bit Pulses
The current source shown in the figure is designed to support toroidal-cavity nuclear-magnetic-resonance electrophoresis (TCNMRE) measurements of molecular electrical mobility in chemical samples. To do so,...

February 4, 2002 [Ideas For Design]
Negative Resistance Nulls Potentiometer's Wiper Resistance
While almost always called "potentiometers" (which are technically defined as three-terminal variable voltage dividers), many "pots" actually end up being used as variable resistors (rheostats) instead. When used as a variable resistor, all...

November 19, 2001 [Ideas For Design]
Thermostat For High-Altitude Atmospheric Sampler is Fault-Tolerant
Among the many measures of good circuit design (e.g., cost, performance, and efficiency), none is more important than reliability. Usually, adequate expected reliability can be achieved by simply sticking to conservative design rules and good...

October 29, 2001 [Ideas For Design]
Measure Projectile Velocity Optically With An Ohmmeter
Archery and target shooting with firearms and air guns are just a few of the many sports and pastimes that involve high-speed projectiles. A handy accessory for any of these activities is some means of accurately measuring the speed of the...

August 20, 2001 [Ideas For Design]
16-Bit PWM Optoisolated DAC Is PC-Controlled
There was a time when an "honest" (e.g., DNL < 1/2 LSB) 16-bit digital-to-analog converter (DAC) was an expensive, premium component. Nowadays they're almost jellybeans—almost. Some applications, however, can still benefit from multichip...

July 9, 2001 [Ideas For Design]
"Take-Back-Half" HVAC Thermostat Is Precise And Energy-Efficient
Implementing tight control of environmental temperature is essential in many critical areas. For instance, it's necessary when research laboratories house sensitive instrumentation and for manufacturing facilities involved in high-precision...

June 4, 2001 [Ideas For Design]
Decompensated Op-Amp Gain Is Adjustable From Zero To Open-Loop
Over three decades ago, the internally frequency-compensated, monolithic op amp was introduced. Since then, many of these devices have been made available in two variations. While both versions are designed to maintain the same dc parameters, they...

May 7, 2001 [Ideas For Design]
Series-Connected Transistors Use Differential Heating To Sense Airflow
Among the methods available for airflow measurement, thermal flow meters enjoy the virtues of simplicity. They also offer simple construction, low cost, and superior sensitivity to low flow rates (less than 1000 fpm). All thermal anemometers make...

April 2, 2001 [Ideas For Design]
Digital-To-Analog-Resistance Converter Is Optically Isolated
The subject of digital-to-analog converter (DAC) applications is generally rather tame. It's usually confined to a boring discussion of settling time, the number of bits of resolution needed, the virtues of serial or parallel interfaces, and whether...

March 19, 2001 [Ideas For Design]
Precision Thermostat Uses TBH And AC Feed-Forward Compensation
Precision temperature control with relatively high-power heaters driven directly from unregulated "120-V" ac lines is an efficient, inexpensive way to manage large thermal loads. A number of annoying complications can render this straightforward...

March 5, 2001 [Ideas For Design]
Linear-RMS Phase Control Improves Thyristor-Based Thermostat
Precision temperature control circuits for small thermal loads like oscillator crystals and voltage references tend to be fairly easy to design. This is because simple, well-behaved, linear-output drivers running from regulated dc supplies are often...

February 19, 2001 [Ideas For Design]
Tunable Diode Laser Photocurrent Amplifier Has 80-dB Logarithmic Gain
Tunable diode lasers (TDLs) are of increasing importance in many optoelectronic applications, including wavelength division multiplex communications and chemical analytical spectroscopy. TDLs are unexcelled as coherent, high-intensity,...

February 5, 2001 [Ideas For Design]
One Single-Section Potentiometer Sets The Gain On Two Channels
What signal conditioning circuit could possibly be easier or more straightforward to design than a dual-channel dc amplifier with a common tracking-gain control? Of course, the obvious way to realize this trivial function is by simply wiring up...

January 22, 2001 [Ideas For Design]
Low-Power Solid-State Airflow Detector
Explicit airflow detection is essential in many applications. High power-density electronics are liable to overheat and self-destruct when cooling-fan failures go unnoticed. Heating and air-conditioning systems often incorporate multipoint...

January 8, 2001 [Ideas For Design]
Circuit Enables Precision Control In Radiant Heating Systems
Successful design of precision temperature-control loops, like all high-performance servo systems, depends on careful management of the usual feedback gain and bandwidth tradeoffs. While always tricky, these interactions can become unmanageable if the...

December 18, 2000 [Ideas For Design]
Digitally Controlled Potentiometer Linearizes A Cryogenic Thermocouple
Regardless of its many personality flaws, the ordinary bi-metallic thermocouple (TC) remains the dominant technology for industrial temperature sensing. TCs are popular because of their durability, simplicity, and low cost, not to mention their...

December 4, 2000 [Ideas For Design]
Take Back Half: A Novel Integrating Temperature-Control Algorithm
According to Linear Technology’s Jim Williams, “The unfortunate relationship between servo systems and oscillators is very apparent in thermal control systems.” (Linear Applications Handbook, 1990). High-performance temperature control is...

November 20, 2000 [Ideas For Design]
Simple Current-Loop Transmitter Converts PWM To 4-to-20-mA Output
Over long cable runs, an isolated 4-to-20-mA current loop offers robust noise immunity and tolerance. This characteristic makes it popular for analog data transmission in noisy industrial and process control environments. Unfortunately, the...

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