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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.


Filtering unwanted RFI (radio frequency interference) out of audio equipment.
AUDIO AMATEUR 1/1978 [Mar 1978] (v.9#1) pg. 48

A simple switchable low pass RFI filter removes ham radio and CB radio interference that is being picked up by a phono cartridge.
AUDIO AMATEUR 1/1981 [Feb 1981] (v.12#1) pg. 39

Improve any audio system by adding an RFI (radio-frequency interference) line filter to the 120VAC outlet box that serves your system.
AUDIO AMATEUR 1/1984 [Mar 1984] (v.15#1) pg. 38

Tip on filtering all zeners (including 3-terminal regulators) to reduce RFI.
AUDIO AMATEUR 2/1990 [Apr 1990] (v.21#2) pg. 59

Your power line, just 60 Hz. A review of interference from AC power lines, fluorescent lamps and switching power supplies that can affect the performance of audio systems. Describes the use of a commercial power-line filter (the Adcom ACE-515 AC enhancer) to reduce the problems.
AUDIO AMATEUR 2/1991 [Apr 1991] (v.22#2) pg. 46
Added Info AUDIO AMATEUR 4/1991 [Oct 1991] (v.22#4) pg. 36 (Power Wedge II AC Power Conditioner)
Added Info AUDIO AMATEUR 3/1993 [Sep 1993] (v.24#3) pg. 32

AC line filter for use with a Philips-style CD player.
AUDIO AMATEUR 1/1996 [Mar 1996] (v.27#1) pg. 48

Using differential circuits in AC power supplies and amplifiers to effectively reduce hum and noise.
AUDIO AMATEUR 2/1996 [May 1996] (v.27#2) pg. 36

Broadcast-band notch filter uses a series-resonant "wave trap" to eliminate an interfering broadcast signal without affecting receiver sensitivity in the SW bands.
COMPUTERS & ELECTRONICS Feb 1983 (v.21#2) pg. 68

Mobile filter eliminates ignition noise from 2 meter walkie-talkie style transceivers which get their power via an automobile cigarette lighter plug.
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1981 (v.37#4) pg. 60

Conquering front-end overload in the TS-940S. Simple filter circuits cure interference caused by a nearby broadcast station.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1988 (v.44#1) pg. 42
Correction CQ. THE RADIO AMATEUR'S JOURNAL Mar 1988 (v.44#3) pg. 72
Added Info CQ. THE RADIO AMATEUR'S JOURNAL Apr 1988 (v.44#4) pg. 6

RFI (radio frequency interference) and the novice. Some basic information about its causes and remedies. Part 1. High- and low-pass filters for TVI. VCR inteference.
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1988 (v.44#4) pg. 38

RFI (radio frequency interference) and the novice. Some basic information about its causes and remedies. Part 2. Benefit of ferrite chokes.
CQ. THE RADIO AMATEUR'S JOURNAL May 1988 (v.44#5) pg. 20

Build a "synthetic" crystal filter to plug into your headphone jack which does a better job than RC active filters in screening out nearby RF noise. Features two CW bandwidths, two phone bandwidths, and two notch filters.
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1990 (v.46#4) pg. 18

Eliminate powerful AM broadcast-band interference with amateur radio receivers. Using wave traps, a band-rejection filter, and/or a ladder attenuator. Includes construction notes.
CQ. THE RADIO AMATEUR'S JOURNAL Jun 1995 (v.51#6) pg. 84

QRN Squasher MK-II. How to build an inexpensive noise-reduction circuit that will cancel up to 50 dB of local manmade electrical noise with minimal or no reduction in the strength of the desired signal.
CQ. THE RADIO AMATEUR'S JOURNAL Jun 1996 (v.52#6) pg. 24
Added Info CQ. THE RADIO AMATEUR'S JOURNAL Dec 1996 (v.52#12) pg. 36
Added Info CQ. THE RADIO AMATEUR'S JOURNAL Jul 1997 (v.53#7) pg. 62
Added Info CQ. THE RADIO AMATEUR'S JOURNAL Sep 1997 (v.53#9) pg. 8
Correction CQ. THE RADIO AMATEUR'S JOURNAL Nov 1997 (v.53#11) pg. 57

FM interference filter.
ELECTRONICS ILLUSTRATED Jan 1963 (v.6#1) pg. 60

Four-bit filter. Simple filter attaches to TV antenna leads and tunes out CB radio interference. Est. cost: $.50.
ELECTRONICS ILLUSTRATED Mar 1967 (v.10#2) pg. 60

Basic AM trap circuit can prevent AM signals in AC power line from getting into audio equipment.
ELECTRONICS NOW Jul 1994 (v.65#7) pg. 10

Simple capacitive filter circuit to eliminate RFI spikes from the AC power line. Such spikes can be caused by automatic light controllers.
ELECTRONICS NOW Feb 1995 (v.66#2) pg. 11

Cure the interference problems common to older, less sensitive radio receivers (antique radios) with this simple wave trap.
ELEMENTARY ELECTRONICS Mar-Apr 1980 (v.20#2) pg. 55

Tip on need for a power-line outlet box with built-in toroid line filters to prevent computer-induced RFI from affecting telephones, TV, etc.
HANDS-ON ELECTRONICS Feb 1987 (v.4#2) pg. 96

Build a BCB (broadcast band) trap that connects between your antenna and shortwave receiver and blocks strong local BCB signals.
HANDS-ON ELECTRONICS May 1988 (v.5#5) pg. 73

Static smasher. Bandpass filter uses a capacitor and an inductor connected in parallel to pass only a narrow band of frequencies. It helps eliminate interference from electrical sources. Rotary switches on the filter allow a choice of 28 different passbands to choose from.
MODERN ELECTRONICS [1] Oct 1978 (v.1#8) pg. 54

Simple quarter-wavelength traps made from 300-ohm TV twin-lead transmission line are used to eliminate cordless telephone (FM) interference on television receivers.
MODERN ELECTRONICS [2] Jun 1988 (v.5#6) pg. 86

TVI filter attaches to your television antenna terminals and filters out CB radio interference.
POPULAR COMMUNICATIONS May 1990 (v.8#9) pg. 66

Schmetic for a harmonic trap to help eliminate TV interference caused by your CB radio.
POPULAR COMMUNICATIONS Aug 1993 (v.11#12) pg. 33

High-pass filter for TV set will filter out citizens band signals.
POPULAR ELECTRONICS [1] Jun 1968 (v.28#6) pg. 58

Filter circuit to remove CB interference from TV signal.
POPULAR ELECTRONICS [1] Aug 1973 (v.4#2) pg. 100

Reduce television interference on 6-, 10- and 11-meter bands with this tuned bandpass filter.
POPULAR ELECTRONICS [1] Nov 1973 (v.4#5) pg. 62

Noise and interference filter for shortwave receiver. Active audio filter improves selectivity with a cutoff frequency of 3 KHz. Est. cost: $8.
POPULAR ELECTRONICS [1] Jan 1974 (v.5#1) pg. 56

A hi-lo pass filter for a CB transceiver. It drains off dc or low frequency signals caused by static electricity build-up on the antenna and it reduces interference to nearby TV receivers.
POPULAR ELECTRONICS [1] May 1975 (v.7#5) pg. 38

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

CB interference with TV. Part 1. Using a high-pass filter or series-tuned wave trap to overcome "fundamental blocking", a primary cause of TV interference from CB radios.
POPULAR ELECTRONICS [1] Jul 1975 (v.8#1) pg. 78

Signal trap filter can eliminate false shortwave signals caused by a nearby AM station.
POPULAR ELECTRONICS [1] Sep 1975 (v.8#3) pg. 91

Power line filter to insulate radios from fluorescent lamp interference.
POPULAR ELECTRONICS [1] Nov 1975 (v.8#5) pg. 105

Coaxial capacitors can quiet interference caused by electric motors in automobiles.
POPULAR ELECTRONICS [1] May 1977 (v.11#5) pg. 88

How to install ceramic capacitors in a hi-fi amplifiers power supply in order to eliminate diode transients which can cause interference on the AM band.
POPULAR ELECTRONICS [1] Jul 1978 (v.14#1) pg. 77

Active outboard filter for low-cost ham radio rigs improves Morse code readability by improving selectivity and reducing interference.
POPULAR ELECTRONICS [1] Sep 1980 (v.18#3) pg. 102

Tip on installing a wave trap to filter out unwanted AM radio signals.
POPULAR ELECTRONICS [1] Feb 1981 (v.19#2) pg. 87

Make a lowpass-filter that inserts between microphone and preamp and reduces RF electromagnetic interference getting into ham transmitter.
POPULAR ELECTRONICS [2] Jun 1991 (v.8#6) pg. 77

Circuits for a typical LPF (lowpass filter) and HPF (highpass filter) which can help eliminate radio interference and prevent overloading the front end of a receiver.
POPULAR ELECTRONICS [2] Jan 1993 (v.10#1) pg. 80

Tunable bandpass filter circuit for use in the 40-meter band.
POPULAR ELECTRONICS [2] Apr 1993 (v.10#4) pg. 81

Circuit for an absorptive filter to block television interference, especially on Channel 2 (54-60 MHz).
POPULAR ELECTRONICS [2] Feb 1997 (v.14#2) pg. 62

How to overcome AM broadcast band interference. Includes a simple high-pass filter circuit that reduces the amplitude of standard BCB signals before they can overload a high-frequency or shortwave receiver.
POPULAR ELECTRONICS [2] Feb 1999 (v.16#2) pg. 8

Make your own filters to eliminate CB interference from TV or stereo sets.
POPULAR MECHANICS Apr 1977 (v.147#4) pg. 230

Tip: How to add disc capacitors to a hi-fi system to cope with interference from CB or ham sets.
POPULAR MECHANICS Sep 1979 (v.152#3) pg. 56

How to get rid of RFI (radio frequency interference) in your hi-fi system. Includes use of filters and adjustments to your equipment.
RADIO-ELECTRONICS Mar 1977 (v.48#3) pg. 43

Simple and inexpensive way to eliminate harmonic interference utilizes a 1/4-wavelength transmission line stub.
RADIO-ELECTRONICS Mar 1981 (v.52#3) pg. 76

Interference traps for shortwave listeners and longwave enthusiasts. Eliminate interference from strong, local, braodcast-band (AM radio) stations.
RADIO-ELECTRONICS Dec 1983 (v.54#12) pg. 86

Curing electromagnetic interference. Part 3. How to head off interference before it enters your electronic equipment. Also, how to deal with power-line transients.
RADIO-ELECTRONICS Feb 1986 (v.57#2) pg. 71

Using ferrite rings to suppress RFI on external wires.
RADIO-ELECTRONICS May 1987 (v.58#5) pg. 127

Tips on filtering out a nearby AM radio station's RF that is being picked up by an audio amplifier.
RADIO-ELECTRONICS Mar 1990 (v.61#3) pg. 12
Added Info RADIO-ELECTRONICS May 1990 (v.61#5) pg. 14