Electrical Engineer Crossword (Issue 270)

The answers to Circuit Cellar’s January electronics engineering crossword puzzle are now available.


1.     ICONOSCOPE—The first widely used television camera tube

5.     INTERRUPTROUTINE—Responds to disturbances [two words]

8.     RADIXPOINT—Separates a number’s integer part from its fraction part [two words]

11.   IMPEDANCE—Bridge circuit used to measure resistance

14.   SALLENKEY—A simple filter topology used to implement second-order active filters [two words]

16.   TYNDALLEFFECT—Light scattering [two words]

17.   LADDER—A kind of passive filter

18.   INPUTOUTPUT—Microcontrollers contain these type of peripherals [two words]

19.   IDEMPOTENTLAW—The result never changes [two words]



2.     NANDCIRCUIT—Combines two types of functions in a binary circuit with two or more inputs and one output [two words]

3.     BARDEEN—Won the Nobel Prize in Physics twice

4.     DIODE—Developed in 1904 by English engineer John Ambrose Fleming

6.     ECHOBOX—A device that receives part of a transmitted pulse and transmits it back to the receiver [two words]

7.     KARNAUGHMAP—Used to simplify algebra expressions [two words]

9.     FARADY—English scientist (1791–1867) who published the law of induction

10.   GANGED—Tuning that uses a single control to tune two or more circuits

12.   DCGENERATOR—French instrument maker Hippolyte Pixii developed a prototype for this in 1832 [two words]

13.   ILLUMINATE—What an LED does

14.   SAWTOOTH—A waveform with a slow linear rise time and a fast fall time

15.   RCSERVO—An absolute-positioning actuator that is typically limited to a 180° rotation  [two words]

Electrical Engineer Crossword (Issue 269)

The answers to Circuit Cellar’s December electronics engineering crossword puzzle are now available.


1.     MOSFET—According to Ed Nisley in his Circuit Cellar 265  2012 article, this type of tester characterizes a transistor’s behavior by computing the drain resistance at each combination of measured voltage and current

5.     LORENTZ—Type of force on a charged particle caused by electromagnetic fields

9.     TWEED—Tests your engineering know-how in every issue of Circuit Cellar

10.   HOMECONTROL—In last month’s “Task Manager,” Circuit Cellar Editor-in-Chief C. J. Abate mentioned that this was one of the hottest topics in the magazine’s earliest issues [two words]

12.   TASK—In his article in this issue, Bob Japenga defines this as an instance of a software program that is utilizing CPU resources to accomplish some purpose

14.   WIRTH—Swiss computer scientist who designed the Pascal programming language

16.   ILLUMINATION—An LED’s purpose

18.   CALLBACK—Enables a lower-level software layer to request a higher-level-defined subroutine

19.   ELECTRICALRESISTANCE—German physicist Georg Ohm 1789 – 6 July 1854 first introduced this concept [two words]


2.     SHANNON—Cryptographer known as the “father of information theory”

3.     AUTONOMOUSROBOT—Does not rely on human interaction [two words]

4.     BODEPLOT—Represents a system’s gain and phase as a frequency function  [two words]

6.     EAGLE—Commonly used for PCB design

7.     TACHOMETER—A device that can help you determine revolutions per minute

8.     PROGRAMMABLELOGIC—These types of projects utilize FPGAs, PLDs, and other chips [two words]

11.   THERMOELECTRIC—Type of cooling that relies on the Peltier effect to alter heat between two types of materials

13.   MAGNETOMETER—Used to measure magnetic fields’ strength and intensity

15.   GREENENERGY—Focus of Renesas’s 2012 design challenge [two words]

17.   NONCE—Available for a limited time


Electronic Engineering Crossword (Issue 268)

The answers to Circuit Cellar’s November electronics engineering crossword puzzle are now available.


2.     FLOWCODE—Columnist Jeff Bachiochi taught readers how to use this graphical programming language in his recent article about flowcharting (Circuit Cellar 266, 2012)

7.     LAPLACE—This type of transform is similar to Fourier, but expresses functions into moments as opposed of vibration

11.   RACEWAY—Channel to hold wires, cables, etc.

12.   SENSORSCircuit Cellar’s 250th issue (2011) focused on Measurement and this other topic

13.   LANDS—A metallic contact area

14.   BITTI—Interviewee (Circuit Cellar 253, 2011) who designed the “Witness Camera,” a self-recording surveillance camera

17.   DARLINGTON—This type of pair can be produced using individual transistors or purchased as a single device, as in a 2N6301

18.   WAFER—A slice of semiconductor material upon which monolithic ICs are produced

19.   DIELECTRICCORE—The insulating material that makes up the center of the cable through which the conductors are run [two words]

20.   THERMOPLASTIC—A synthetic, flexible mixture of rosins used as an insulting material


1.     ROUNDKEYS—In his article “Hardware-Accelerated Encryption” (Circuit Cellar 266, 2012) Patrick Schaumont said AES encryption’s real secrecy comes from the periodic additions of these

3.     OILCAN—A type of planar tube, similar to the lighthouse tube, which has cooling fins

4.     VECTORGRAPHICS—In the 1970s, Circuit Cellar founder Steve Ciarcia wrote his first article for BYTE about this topic

5.     VOLTAGECONTROLLED—An oscillator controlled by voltage input; there are usually two types: harmonic and relaxation [two words]

6.     TEMPEST—Describes compromising emanations

8.     ACQUISITIONTIME—In a communications system, the time interval required to attain synchronism [two words]

9.     INTEL—Company credited with making the first single-chip microprocessor

10.   HANDSHAKING—How one device communicates with one or more other devices, at a predetermined speed

15.   VARACTOR—Used as a capacitor to control voltage

16.   SALLENKEY—Active filer, two-pole [two words]


Electronics Engineering Crossword (Issue 267)

The answers to Circuit Cellar’s October electronics engineering crossword puzzle are now available.


1.     QUADRATURESIGNAL—Can be produced using two sensors spaced at odd half-slot multiples around a single track [two words]

4.     MICROELECTROMECHANICAL—This type of system’s size ranges from 20 µm to 1 mm

8.     MANCHESTERCODE—A low-to-high transition means “0” and a high-to-low transition means “1” [two words]

9.     ABSOLUTEDECODER—Because these devices have only one track per bit of resolution, they can require large diameters, which gives them a nonvolatile and unique output for each position [two words]

15.   BATTERY—Italian physicist Alessandro Volta (1745–1827) is credited with inventing the first one of these in the 1800s

16.   DIGITALFILTER—A piece of software, firmware, or logic circuit that takes a digital data flow as an input and provides a filtered version of this signal on its output [two words]

17.   CONCURRENCY—Topic of columnist Bob Japenga’s ongoing article series, which began in Circuit Cellar 263, 2012

18.   EXBIBYTE—1,152,921,504,606,846,976 bytes

19.   RELATIVEHUMIDITY—Amount of water vapor in the atmosphere expressed as a percentage of the total amount the air can hold at the current temperature [two words]


2.     ACCELEROMETER—The design in Mark Pedley’s article, “eCompass: Build and Calibrate a Tilt-Compensating Electronic Compass” (Circuit Cellar 265, 2012), was built using one of these

3.     SANDER—New Zealand-based Circuit Cellar contributor and recent interviewee who is fascinated with advanced robot technologies

5.     PHASELOCKEDLOOP—This control system generateS an output frequency, which can be either higher or lower than the input, based on a reference input clock [three words]

6.     NEUROMORPHICCircuit Cellar’s October’s interviewee, Helen Li, believes this type of computing will solve the contradiction between the limited functions of computing systems and the ever-increasing variety of applications

7.     ELECTROSTATIC—This type of cell consists of a thin plastic film sandwiched between two metal stators

10.   BOOSTCONVERTER—Its output voltage is greater than its input voltage [two words]

11.   ARMSTRONG—American engineer (1890—1954) who invented the regenerative circuit, the super-regenerative circuit, the superheterodyne receiver, and modern frequency modulation (FM) radio transmission

12.   INCLINOMETER—Used to measure tilt

13.   SHALLENBERGER—American engineer (1860–1898) who invented an induction meter to measure alternating current

14.   MEMRISTOR—The functional equivalent of a synapse


Electronics Engineering Crossword (Issue 266)

The answers to Circuit Cellar’s September electronics engineering crossword puzzle are now available.


3.     ZUSE—German engineer inventor and engineer (1910–1995) who is credited with creating the Z3, a program-controlled Turing-complete computer

5.     ROOTMEANSQUARE—Alternating voltage/current with the exact same energy content as the same value of direct current; a.k.a., quadric mean [three words]

10.   BLOB—Stores binary data; synonym: drop

13.   KLYSTRON—A specialized linear-beam vacuum tube

16.   ELECTROMAGNET—English physicist and inventor William Sturgeon (1783-1850) is credited with using electric current to develop the first one of these objects in 1825

17.   LACOSTE—Circuit Cellar columnist who frequently writes about frequency

18.   SMARTSWITCH—An energy-saving device that was the topic of Fergus Dixon’s article (Circuit Cellar, 263 2012) [two words]

19.   PICOAMMETER—Measures low current


1.     PUBLICKEYCRYPTOGRAPHY—Decodes using two pieces of information, one public and one private [three words]

2.     COMPRESSIONDRIVER—A loudspeaker that achieves high efficiencies by using a consolidating technique [two words]

4.     SPIDER—The flexible collar that helps keep a voice coil magnetically centered

6.     MICROPOWERIMPULSERADAR—A pocket-sized radar that runs off AA batteries and is often used as a basic motion sensor for security applications [three words]

7.     ALPHATESTING—Check performed by an independent team on a system installed at a place other than the targeted customer’s site [two words]

8.     ATOMICOPERATION—An action that is non-interruptible by any other one and never presents partial results to an outside observer [two words]

9.     EMBEDDED—As Circuit Cellar prepares to celebrate its 25th anniversary, a  past, present, and future key theme of the magazine centers on this type of technology

11.   SIGNALPROCESSING—Involves measuring physical quantities with time and spatial variances [two words]

12.   FLOWCHARTING—Jeff Bachiochi describes how to use this technique to write code in this issue

14.   CONVOLUTION—Mark Csele’s article, “DSP-Based Color Organ” (Circuit Cellar, 249 2012), used this technique to create high-performance filters

15.   MULTIPLEXER—A device that combines input signals, shares a single transmission channel, and enables data compression


Electronics Engineering Crossword (Issue 265)

Here are the answers to the crossword puzzle in Circuit Cellar 265, August 2012. The issue is now available.


1.     CUTOFFFREQUENCY—The frequency where a filter’s output has fallen by 3 dB from the maximum level that can be achieved through the filter [two words]

3.     SHAMIR—Israeli cryptographer and one of inventors of the RSA algorithm

6.     AVOGADROSLAW—V/n = k, where V is the volume of the gas, n is the amount of substance of the gas, and k is a proportionality constant [two words]

8.     NOISEFIGURE—Columnist Robert Lacoste’s article, “Noise Filters 101” (Circuit Cellar, April 2012), discussed how to determine this and measure it in a radio frequency filter [two words]

11.   JAVASCRIPT—ECMAScript-approved language that supports a lot of C-structured programming syntax

12.   VOLTAGESPIKE—Lightening or a tripped circuit wire, for example [two words]

15.   THEAMPHOUR—Name of the radio show co-hosted by two recent Circuit Cellar Q&A interviewees [three words]

16.   BLOCKED—When a software thread relinquishes control of the processor to the operating system

17.   KILBY—American physicist (1923-2005) who worked with Robert Noyce to create the first integrated circuit

18.   OCTAVE—The interval between one musical pitch and another with half or double its frequency

19.   PYROELECTRICDETECTOR—A capacitive sensor that changes its polarization in response to a change in temperature [two words]

20.   KYZPULSE—In a mechanical electrical meter, a pulse that changes state every half rotation of the meter’s disk and represents a quanta of energy [two words]


2.     TOOLCHAIN—Software used to create other software, usually including a text editor, a compiler, a linker, and a debugger

4.     HENRY—A unit of inductance; abbreviation “H”

5.     RADIOFREQUENCY—An amount of oscillation ranging from 3 kHz to 300 GHz [two words]

7.     DEPTHCAMERA—Miguel Sanchez’s article, “Image Processing Development” (Circuit Cellar, June 2012), used one of these along with an MCU and bipolar stepper motors to accomplish some computer vision-related tasks [two words]

9.     OHIOSCIENTIFIC—In 1978, this company released one of its first products—a simple, MOS Technology 6502 microprocessor-based, single-board computer [two words]

10.   PHOTOVOLTAICCELL—According to Jeff Bachiochi’s article in this issue, a single one of these is “a translucent sandwich of P-type and N-type material forming a huge diode junction that can be exposed to a light source” [two words]

13.   LOGPOT—Abbreviation; used as a volume control in audio amplifiers [two words]

14.   AMPERE—An SI unit of electric current


Electronics Engineering Crossword (Issue 264)

The answers to Circuit Cellar’s July Electronics Engineer crossword puzzle are now available.

Issue 264 crossword answers


3.     IONIZATION—Occurs when an atom or molecule gains either and positive or negative charge

4.     ANDROIDPHONE—In “Audio-Enhanced Touch Sensors” (Circuit Cellar, May 2012), Matt Oppenheim said one of the stumbling blocks of using this for data collection is that it will try to recharge itself whenever you connect it to a USB port. [two words]

6.     FOLTZER—Circuit Cellar interviewee who participated in Motorola’s IEEE-802 MAC subcommittee on token-passing access control methods. [two words]

13.   COORDINATEDUNIVERSALTIME—A method of keeping the world in sync [three words]

14.   CICCHINELLI—Circuit Cellar published his book about a commonly used computer programming language in 2010

17.   HACKSPACE—i.e, “a circuit cellar”

18.   CHIP—A basic component of an electronic device

19.   VOLTAGEREFERENCE—National Semiconductor’s LM385 series is an example of an adjustable one. [three words]


1.     DOPPLEREFFECT—A phenomenon that occurs when a vehicle sounding a siren approaches, passes, and recedes from an observer [two words]

2.     WAVEFORMGENERATOR—A device that produces electronic signals [two words]

5.     ANGSTROM—Equals 1/10,000,000,000 m

7.     ISOTHERMALPROCESS— ΔT = 0 [two words]

8.     COMPARATOR—A device that compares two voltages or currents and switches its output to indicate which is larger

9.     NSPE—Organization formed in 1934 by bridge engineer David Steinman

10.   EMI—Acronym; common cause of electronic data corruption and subject of Novacek’s December 2011 Circuit Cellar article [two words]

11.   PIEZOELECTRICITY—Occurs when crystals acquire a charge after being compressed, twisted, or distorted (e.g., quartz)

12.   WIDLAR—American electrical engineer (1937–1991); IC pioneer

15.   LEDDRIVER—Circuitry that regulates or provides powers to a light source [two words]

16.   JOULE—Symbolized by 10th letter of the alphabet

20.   RTOS—Hint: acronym. Unscramble the following: IETEORGSEPSMNYMRLTIAEAT

Electronics Engineering Crossword (Issue 263)


1.     SPARKGAP—A space in an otherwise closed electric circuit [two words]

3.     FUZZYLOGIC—Began in 1965 with Lotfi Zadeh’s proposal of a certain type of set theory [two words]

6.     NULLTEST—Cancels a device’s signal input by negative feedback from its output [two words]

7.     COULOMB—One of these is equal to 6.28 x 1018 electrons

10.   EDDYCURRENT—A.k.a. Foucault currents [two words]

11.   KIRCHHOFF—Created a law of thermochemistry

13.   ANDGATE—Relies on truth and logic  [two words]

16.   HOLONYAK—Invented the LED while working at General Electric in the 1960s

17.   SOLIDSTATERELAY—Doesn’t rely on movement or contact to switch electric circuits [three words]

20.   ACCIRCUIT—A circuit with a current that goes one way and then another [two words]


2.     ANNEAL—Run hot and cold

4.     OPTOISOLATOR—Changes electrical signals to light and back into electrical signals

5.     CHECKBIT—Adds a bit to make things even or odd [two words]

8.     MICROFARAD—1,000,000 pF

9.     THEVENIN—French engineer (1857–1926); augmented Ohm’s law

12.   KELVINSCALE—Temperature scale where 0° = absolute zero [two words]

14.   PHOTODIODE—Turns light into current or voltage

15.   ACORNTUBE—A small tube used at very high frequencies [two words]

18.   ERG—Causes 1 cm of movement

19.   ASCII—A character-encoding system used to represent text


Electronics Engineering Crossword (Issue 262)


3.     CATHODERAYOSCILLOSCOPE—Isn’t a digital ’scope [three words]

6.     PASSBAND—A super-efficient band of frequencies

9.     MESHNETWORKING—Relies on nodes to capture, distribute, and reproduce data [two words]

11.   PYTHON—An open-source programming language that relies of automatic memory management

13.   NORTONSTHEOREM—A formula for linear electrical networks [two words]

15.   TRIMMER—Variable resistors, variable capacitors, or trimmable inductors, for example

18.   DATATRANSFERRATE—Measures data’s speed of travel [three words]



1.     COLUMBSLAW—Electrostatic physics principal [two words]

2.     NOVACEK—Wrote 26 feature articles for Circuit Cellar between 1999 and 2004

4.     CYGWIN—Enables you to “get that Linux feeling on Windows”

5.     ELECTROLUMINESCENCE—Light emission caused by electrical influences

7.     SCHMITTTRIGGER—A comparator with two different threshold voltage levels [two words]

8.     POLARITYSWITCH—Reverses an output signal’s absolute phase [two words]

10.   SIEMENS—Equivalent of amperes per volt

12.   RAREFACTION—Sound wave phase

14.   SLEWRATE—Represents a signal’s maximum rate of change [two words]

16.   QFACTOR—Measures the damping of resonator modes

17.   GERBER—PCB file format

19.   TRIODE—An amp device with three electrodes

20.   SPRAGUE—Known as the “father of electric traction”


Electronics Engineering Crossword (Issue 261)

The answers to the crossword puzzle published in rCircuit Cellar 261, April 2012.


7. MANCHESTERENCODING—A form of BPSK [two words]

10. REBOOT—Restart

13. HASHTAG—The # label

15. DIRECTORY—File index

17. DAEMON—Takes place behind the scenes

18. FREEBASIC—Open-source programming language compiler

19. MALWARE—Bad code


1. PHASESHIFTKEYING—Transports data by altering a reference signal’s phase [three words]

2. FOURIERTRANSFORM—Changes a signal from the time domain to the frequency domain [two words]

3. ATTENUATON—Used to measure signal loss in dB

4. SHANNONTHEOREM—AKA, the noisy-channel coding theorem [two words]

5. BOOLEAN—Logic system named after George Boole

6. FREQUENCYMODULATION—Opposite of AM [two words]

8. COULOMBCOUNTER—Measures battery current [two words]

9. FOURTHGENERATION—4G [two words]

11. FIRSTQUARTILE—25th percentile [two words]

12. NORTONAMPLIFIER—Converts a current to a voltage. [two words]

14. HBRIDGE—Four switching components with the load in center

16. CODIFY—A way to organize