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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.


Op amps for audio. Part 3. Regulated power circuits (RC filter, voltage regulator, power supply).
AUDIO AMATEUR 4/1974 [Apr 1975] (v.5#4) pg. 14
Correction AUDIO AMATEUR 2/1975 [Nov 1975] (v.6#2) pg. 38

Build an A-weighting filter. Building a meter preamp to make measurements at very low (microvolt) signal levels using a vacuum-tube voltmeter, digital voltmeter, or oscilloscope.
AUDIO AMATEUR 2/1992 [Jun 1992] (v.23#2) pg. 32
Added Info AUDIO AMATEUR 3/1992 [Sep 1992] (v.23#3) pg. 46

How to simulate electronic filters on your home computer and thus simplify the process of designing the correct filter for a specific application.
BYTE Feb 1978 (v.3#2) pg. 168

An easy-to-use universal active filter IC and typical applications.
COMPUTERS & ELECTRONICS Jul 1983 (v.21#7) pg. 90

Cut-off frequency formulas for identical cascaded RC filter sections.
CQ. THE RADIO AMATEUR'S JOURNAL Jun 1980 (v.36#6) pg. 22

How to build a c.w. filter for the novice operator. Part 1. Est. cost: $15.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1985 (v.41#2) pg. 70

How to build a c.w. filter for the novice operator. Part 2.
CQ. THE RADIO AMATEUR'S JOURNAL Mar 1985 (v.41#3) pg. 72

Build a switched capacitor bandpass CW filter. Includes separate bandpass controls, a frequency control, and an output volume control.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1986 (v.42#1) pg. 44

Some receiver design aids. Methods for employing simple two-section HF bandpass filters at the front end of any homemade receiver.
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1995 (v.51#4) pg. 82

Getting to know RF filters. Workings of harmonic filters and the advantages of using filters that are capable of "laundering" the transmitter output signal.
CQ. THE RADIO AMATEUR'S JOURNAL May 1995 (v.51#5) pg. 98

Using inexpensive L and C components for constructing low-frequency IF filters with toroids.
CQ. THE RADIO AMATEUR'S JOURNAL Jul 1995 (v.51#7) pg. 74

Filter eliminates spurious harmonic radiation from any low-power transmitter (under 100 watts input).
ELECTRONICS ILLUSTRATED May 1971 (v.14#3) pg. 60

Resistive-capacitive (RC) filters and applications.
ELECTRONICS NOW Jun 1993 (v.64#6) pg. 58

Inductive capacitive (LC) filters. How they work and typical applications.
ELECTRONICS NOW Jul 1993 (v.64#7) pg. 69

Active filters. Boost the performance of any resistive-capacitive filter by combining it with one or more operational amplifiers.
ELECTRONICS NOW Aug 1993 (v.64#8) pg. 69

Potpourri of circuits utilizing bipolar junction transistors. Circuits to amplify signals, filter high and low frequencies, generate white noise, flash lamps, etc.
ELECTRONICS NOW May 1994 (v.65#5) pg. 63

Understanding electronic digital filters.
ELECTRONICS NOW Nov 1996 (v.67#11) pg. 61

Designing a linear phase digital filter.
ELECTRONICS NOW Jan 1997 (v.68#1) pg. 59

Designing electronic frequency-selective active AC filters. Looks at low-pass, high-pass, band-pass, and notch filters.
ELECTRONICS NOW Mar 1997 (v.68#3) pg. 52

Special section on electronic filters.
ELECTRONICS WORLD Apr 1969 (v.81#4) pg. 37

Explanation of the new Piezoelectric or mechanical IF (intermediate frequency) filters and how to use them.
ELEMENTARY ELECTRONICS May-Jun 1966 (v.2#2) pg. 45

Get in the swing of simple filters. A review of filter theory written for the hobbyist. Instructions on designing and making your own filters.
ELEMENTARY ELECTRONICS Jan-Feb 1974 (v.14#1) pg. 69

Getting filter design to come easy.
ELEMENTARY ELECTRONICS Mar-Apr 1974 (v.14#2) pg. 43

Novice hams may want to install a CW filter on their receivers to improve selectivity. Some tips.
ELEMENTARY ELECTRONICS Nov-Dec 1978 (v.18#6) pg. 57

Electronic fundamentals. Resonance and filters.
HANDS-ON ELECTRONICS Mar 1987 (v.4#3) pg. 79
Correction HANDS-ON ELECTRONICS Aug 1987 (v.4#8) pg. 4
Correction HANDS-ON ELECTRONICS Oct 1987 (v.4#10) pg. 4
Correction HANDS-ON ELECTRONICS Nov 1987 (v.4#11) pg. 4
Correction HANDS-ON ELECTRONICS May 1988 (v.5#5) pg. 6

Ripple Suppressor circuit reduces AC adaptor ripple of 450 mV down to less than 5 mV.
HANDS-ON ELECTRONICS Mar 1988 (v.5#3) pg. 96

E-Z math (for electronics). Low and high pass filter design.
HANDS-ON ELECTRONICS Jul 1988 (v.5#7) pg. 77

A universal active filter. Circuits utilize a Motorola MF10 switched-capacitor active filter which may be configured to handle any of the four basic filter rolls (bandpass, notch, lowpass, and highpass).
MODERN ELECTRONICS [2] Mar 1985 (v.1#6) pg. 70

Using op amps. Practical applications of the ubiquitous op amp as an amplifier, a filter, and a limiter.
MODERN ELECTRONICS [2] Oct 1985 (v.2#4) pg. 26

Designing active filters. A short-cut method for practical design of first-through-third-order active filters. Part 1. Filter basics and how to design first-order active filters.
MODERN ELECTRONICS [2] Jun 1986 (v.3#6) pg. 54

Designing active filters. Part 2. Second- and third-order filters.
MODERN ELECTRONICS [2] Jul 1986 (v.3#7) pg. 54

Active-filter circuits which use Linear Technology's LTC1062 active-filter IC.
MODERN ELECTRONICS [2] Aug 1988 (v.5#8) pg. 59

Switched-capacitor filter ICs. Includes circuits for a fourth-order Chebyshev bandpass filter, low-pass filter, and a notch filter.
MODERN ELECTRONICS [2] Nov 1988 (v.5#11) pg. 66

Passive wave-shaping circuits. Using resistors, capacitors, inductors and diodes to do a job that has traditionally been the task of op amps and other active elements.
MODERN ELECTRONICS [2] Dec 1988 (v.5#12) pg. 26

Using sweep frequencies in electronics troubleshooting. This technique greatly reduces the time needed to trace a fault to a particular component in a circuit. Looks at RC filter characteristics and how to read and interpret abnormal filter frequency-response curves.
MODERN ELECTRONICS [2] Apr 1989 (v.6#4) pg. 34

Deep-notch resonate filters. Practical advice for designing these extremely useful electronic filter devices.
MODERN ELECTRONICS [2] Sep 1990 (v.7#9) pg. 21

Output filters for SWB reception. Tips on selecting and using a filtering system between a SWL receiver and a good comfortable headset.
POPULAR COMMUNICATIONS Feb 1990 (v.8#6) pg. 39

Figuring out filters. Advice on the selection and use of optional filters and outboard filtering devices to improve DX radio reception.
POPULAR COMMUNICATIONS Sep 1991 (v.10#1) pg. 38

Mechanical filter sharpens bandwidth for optimum reception of AM, CW, SSB, and CB.
POPULAR ELECTRONICS [1] Aug 1965 (v.23#2) pg. 53

Impulse noise suppressor can be added to any SWL, Ham or CB receiver.
POPULAR ELECTRONICS [1] Oct 1968 (v.29#4) pg. 49

Single-frequency filtering method, called digital filtering, uses no critical elements and operates from a digital oscillator.
POPULAR ELECTRONICS [1] Dec 1974 (v.6#6) pg. 63

Active filter sharpens CW reception. Provides 6-dB selectivity of less than 100 Hz. Uses an op-amp in the circuit. Est. cost: $15.
POPULAR ELECTRONICS [1] Jun 1975 (v.7#6) pg. 49

Experimenting with phase-locked loops. Circuits include an ultrasonic switch, tunable filter, touch switch, and SCA decoder.
POPULAR ELECTRONICS [1] Oct 1975 (v.8#4) pg. 47
Correction POPULAR ELECTRONICS [1] Dec 1975 (v.8#6) pg. 6

Circuit for a decoupling filter uses the NSL4944 Universal LED.
POPULAR ELECTRONICS [1] Jul 1976 (v.10#1) pg. 84

Circuit for a high-pass TV filter for use with 75-ohm coaxial lines.
POPULAR ELECTRONICS [1] Aug 1976 (v.10#2) pg. 24

Understanding active filters. Using op-amps makes filter design easy and low cost. How to design high-pass, low-pass or band-pass frequency selective filters.
POPULAR ELECTRONICS [1] Dec 1976 (v.10#6) pg. 69

Clipper circuit filters out bursts of noise caused by atmospheric and power switch noise interference. The clipping threshold is adjustable.
POPULAR ELECTRONICS [1] Jan 1977 (v.11#1) pg. 34

Active filters. Includes a practical circuit for an active band-pass filter using an op amp and a discussion of bandpass design equations.
POPULAR ELECTRONICS [1] Apr 1977 (v.11#4) pg. 75

Circuit for a fifth-order, high-pass filter with a cutoff frequency of 25Hz and a rolloff of 30 dB per octave.
POPULAR ELECTRONICS [1] Nov 1977 (v.12#5) pg. 84

Filter analyzer circuit is used with an oscilloscope to display the filter's frequency response.
POPULAR ELECTRONICS [2] Oct 1990 (v.7#10) pg. 26

An introduction to filter circuits (a frequency-selective electronic network that alters the amplitude and/or phase of an electronic signal).
POPULAR ELECTRONICS [2] Aug 1994 (v.11#8) pg. 69

Filters for QRM radios that can help prevent overload from local AM and FM broadcast stations. Two circuits shown.
POPULAR ELECTRONICS [2] Dec 1995 (v.12#12) pg. 83

Notch filters. How to eliminate unwanted frequencies from circuits, or dislodge unwanted in-band signals from frequencies, by using a narrow bandwidth version of the bandstop filter.
POPULAR ELECTRONICS [2] Aug 1998 (v.15#8) pg. 40
Added Info POPULAR ELECTRONICS [2] Nov 1998 (v.15#11) pg. 6

Audio testing accessories. (1) High-power load bank. (2) IHF-standardized reactive load. (3) Pinking filter. (4) Step attenuator for input signals. (5) RIAA-Equalization inverter. (6) Input/output loads.
RADIO-ELECTRONICS Aug 1980 (v.51#8) pg. 46

How to design high frequency analog filter circuits.
RADIO-ELECTRONICS Sep 1983 (v.54#9) pg. 67

How to design analog filter circuits of both active and passive types.
RADIO-ELECTRONICS Dec 1983 (v.54#12) pg. 81

Resonate circuit design. A generic BASIC program for technicians and experimenters who work with RF circuits or RF filters. Will calculate the frequency, capacitance and inductance values for a resonate circuit and then go on to calculate the design of an air-wound coil.
RADIO-ELECTRONICS Apr 1985 (v.56#4) pg. 12 (ComputerDigest)
Correction RADIO-ELECTRONICS Jul 1985 (v.56#7) pg. 5 (ComputerDigest)

Comb filters for your TV. Learn all about comb filters, how they work, and how they can be used to improve the performance of your video system. Part 1.
RADIO-ELECTRONICS Aug 1985 (v.56#8) pg. 63
Correction RADIO-ELECTRONICS May 1986 (v.57#5) pg. 20

Comb filters for your TV. Part 2.
RADIO-ELECTRONICS Sep 1985 (v.56#9) pg. 67

Build a highly effective FM notch filter from a section of coaxial transmission line. Use it to screen out a local FM station so you can pick up a remote station very near the same frequency.
RADIO-ELECTRONICS Apr 1986 (v.57#4) pg. 14

Basic design concept of a helical resonator trap.
RADIO-ELECTRONICS Mar 1987 (v.58#3) pg. 12

Circuit for (1) an active bandpass filter that can be used to drive the midrange amplifier of a tri-amped three-way speaker, and (2) a subsonic filter to eliminate turntable rumble and tape-recorder flutter. Both circuits use SGS Semiconductor Corp's TDA2320A stereo preamplifier IC.
RADIO-ELECTRONICS Jun 1988 (v.59#6) pg. 38

Working with op-amps. Circuits included for both inverting and non-inverting amplifiers (both AC and DC), voltage followers, audio mixer, adders and subtractors, phase-splitter, and active filters.
RADIO-ELECTRONICS May 1989 (v.60#5) pg. 54

State-variable active filter circuit provides lowpass, bandpass, and highpass outputs.
RADIO-ELECTRONICS May 1989 (v.60#5) pg. 66

Electronic filter fundamentals. (1) Passive filters. (2) Active filters. (3) Other filter types.
RADIO-ELECTRONICS Oct 1990 (v.61#10) pg. 77
Correction RADIO-ELECTRONICS Dec 1990 (v.61#12) pg. 67