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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.


Circuit for a complete VOX that can be added to almost any existing transmitter or transceiver. Uses the LM170 AGC/Squelch chip.
CQ. THE RADIO AMATEUR'S JOURNAL Sep 1979 (v.35#9) pg. 72

Improving the vacuum relay QSK in s.s.b.-VOX operation.
CQ. THE RADIO AMATEUR'S JOURNAL Nov 1980 (v.36#11) pg. 48

Build a noise operated COR (carrier operated relay) for a repeater.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1981 (v.37#2) pg. 18

How to build a deluxe solid-state voice operated relay (VOX).
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1981 (v.37#4) pg. 36
Correction CQ. THE RADIO AMATEUR'S JOURNAL Jul 1981 (v.37#7) pg. 104

Sound-switch circuit will trigger a tape recorder (or other voice-activated device) using speech of normal volume at a range of several feet.

Sound-activated switch. Two hand claps will turn AC devices on or off.

VOX box (voice-operated relay) is a multi-fuctional device. Use it to control a tape recorder, switch on an amateur transmitter, slide projector, etc. It can be used with any low- or high-impedance microphone, or a high-level audio source such as a pocket tape recorder. Est. cost: $15 (kit).

"Junk Box Vox". A voice-operated relay that turns devices on or off when you start speaking. Est. cost: $10.
ELECTRONICS ILLUSTRATED Jan 1966 (v.9#1) pg. 83

Remote control switch is activated by a high-pitched dog whistle. Can be used to turn off TV sound.
ELECTRONICS ILLUSTRATED Mar 1968 (v.11#2) pg. 44

The FET VOX, an electronic device which automatically switches a transceiver to the transmit mode when you start speaking, without flipping a switch manually.
ELECTRONICS ILLUSTRATED May 1968 (v.11#3) pg. 61

Sonic switch will turn power on and off whenever two similar sounds (hand claps, finger snaps, whistles, loud words, etc.) are heard within a one second interval.
ELECTRONICS ILLUSTRATED Sep 1968 (v.11#5) pg. 47

Sound-operated light controller circuits.
ELECTRONICS WORLD Nov 1971 (v.86#5) pg. 39

Circuit for a sound-activated switch to trigger a strobe-flash to take stop-action photos.
ELEMENTARY ELECTRONICS Jul-Aug 1971 (v.11#3) pg. 38

The 3rd ear. A sound-actuated electronic control system (switch). Turn things on-or-off at the snap of your fingers. Will also turn things on for a preset interval, then automatically turn them off.
ELEMENTARY ELECTRONICS May-Jun 1979 (v.19#3) pg. 35

Sound sentry. A noise-activated device will switch on interior and exterior lights, audio system, etc. whenever an unusual sound is detected.
HANDS-ON ELECTRONICS Nov-Dec 1985 (v.2#6) pg. 49
Correction HANDS-ON ELECTRONICS Dec 1986 (v.3#7) pg. 4

How to check your TV's remote-control system. Both infrared and ultrasonic types are discussed.
HANDS-ON ELECTRONICS Mar-Apr 1986 (v.3#2) pg. 75

Circuit for a sound-operated switch that will sense the ringing of a telephone and translate this to a flashing lamp.
HANDS-ON ELECTRONICS Nov 1986 (v.3#6) pg. 32

Voice-operated switch (VOX) circuit is intended for the control of high-power loads, but can be modified for low-power applications.
HANDS-ON ELECTRONICS Mar 1987 (v.4#3) pg. 26

Sound-activated switch. Features both latched and timed outputs.
HANDS-ON ELECTRONICS Apr 1987 (v.4#4) pg. 30
Correction HANDS-ON ELECTRONICS Jun 1988 (v.5#6) pg. 4

VOX box. Voice-operated relay can be used for a variety of purposes, including control of a tape recorder, switching on an amateur transmitter, controling a slide projector, etc.
HANDS-ON ELECTRONICS Aug 1987 (v.4#8) pg. 77

Door-slam switch turns on electric lights whenever door is closed hard. Eliminates need to fumble for lightswitch.
HANDS-ON ELECTRONICS Oct 1987 (v.4#10) pg. 94

Unlock the mystery of voice/remote activation circuits. Expand the usefulness of portable cassette recorders with these circuits. (1) Extended-play circuit slows down the rate of tape travel. (2) Sound-activated tape switch starts recorder when sound is detected. (3) Telephone auto-record circuit records telephone calls coming in and going out from the same phone line.
HANDS-ON ELECTRONICS Nov 1987 (v.4#11) pg. 84

Tone-activated relay circuit can be used to turn on, or off, a wide variety of devices. Est. cost: under $9.
MODERN ELECTRONICS [1] Jul 1978 (v.1#5) pg. 55

Schematic for a voice activated relay built around an LM370 integrated circuit.
MODERN ELECTRONICS [1] Oct 1978 (v.1#8) pg. 6

Hand-clap electronic control turns on and off lights and other electrically operated devices. Clap twice to activate the control.
MODERN ELECTRONICS [2] Jan 1987 (v.4#1) pg. 40

Voice-activated switch to trigger the "remote" jack on a tape recorder. Est. cost: $30 (kit).

Dog whistle signals remote control unit.
POPULAR ELECTRONICS [1] Oct 1964 (v.21#4) pg. 47

Miniature remote control receiver weighs 1-1/2 oz. Operated by a 600 to 800 cycle tone-modulated carrier on the 27 mc remote control channels.
POPULAR ELECTRONICS [1] Apr 1965 (v.22#4) pg. 39
Correction POPULAR ELECTRONICS [1] Jun 1965 (v.22#6) pg. 12

Remote control transmitter sends signals up to 1 mile to activate receiver described in the April 1965 issue. Can also be used with any tone-modulated signal receiver.
POPULAR ELECTRONICS [1] Jun 1965 (v.22#6) pg. 67

Trans-VOX. Transistorized, supersensitive, voice-operated relay turns transmitters, tape recorders and other equipment on and off. You simply plug your microphone into Trans-VOX and plug Trans-VOX into the device to be controlled. Est. cost: $19.
POPULAR ELECTRONICS [1] Jan 1967 (v.26#1) pg. 57

Relay turns on a tape recorder motor whenever the signal being monitored is being received.
POPULAR ELECTRONICS [1] May 1968 (v.28#5) pg. 89

Circuit for a simple voice or sound-controlled relay can handle 1-ampere at 125-volts ac.
POPULAR ELECTRONICS [1] Aug 1975 (v.8#2) pg. 85

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

Using phase-locked loop (PLL) chips to make possible a variety of tone-detection circuits. The type 567 tone decoder is used in automatic garage door openers, radio controlled models, alarm circuits, paging systems and other selective tone circuits.
POPULAR ELECTRONICS [1] Aug 1976 (v.10#2) pg. 91

Circuit for a tone-activated relay. Use the "beeper" on an alarm clock to control electrical appliances.
POPULAR ELECTRONICS [1] Feb 1977 (v.11#2) pg. 77

Circuit will be activated by either a telephone pickup or a dynamic microphone. It will turn on a light in response to a noise (like a telephone or alarm clock ringing). Useful for people with hearing disabilities.
POPULAR ELECTRONICS [1] Mar 1978 (v.13#3) pg. 86

Build the Poor Man's Servant. An inexpensive remote control project that activates or deactivates appliances at the clap of your hands.
POPULAR ELECTRONICS [1] Jul 1979 (v.16#1) pg. 64
Correction POPULAR ELECTRONICS [1] Sep 1979 (v.16#3) pg. 6

Sound-activated switch is used to start and stop a cassette recorder automatically for recording intermittent sounds.
POPULAR ELECTRONICS [2] May 1989 (v.6#5) pg. 87

Voice operated switch uses a voice-recognition chip to respond to a few simple commands (yes, no, on, off, left, right, ...).
POPULAR ELECTRONICS [2] Nov 1989 (v.6#11) pg. 76
Added Info POPULAR ELECTRONICS [2] Dec 1989 (v.6#12) pg. 4

Signal conditioner circuit is ideal for cleaning up weak and noisy audio or Morse-code signals. May also be used to clean up digital tone signals in a remote-control extender circuit.
POPULAR ELECTRONICS [2] Nov 1989 (v.6#11) pg. 85

Sound-operated switch circuit incorporates an optoisolator and can be used to control a lamp.
POPULAR ELECTRONICS [2] Oct 1990 (v.7#10) pg. 24

Whistle Switch lets you turn on a TV, radio, or some other device by sound. The switch requires two or more occurances of a specific tone (or sequence of tones) within a specified time period.
POPULAR ELECTRONICS [2] Jun 1993 (v.10#6) pg. 57

Various switching circuits. (1) Optoisolator/coupler used to isolate the input signal from the output control device. (2) Oscillator-triggered switch. (3) Dual-control switch uses two AC sources to trigger the circuit on and off. (4) Audio-controlled switch.
POPULAR ELECTRONICS [2] Jun 1993 (v.10#6) pg. 70

Build a voice-activated tape recorder switch that controls the "remote" jack on a tape recorder. Est. cost: $13 (kit).
POPULAR ELECTRONICS [2] Jan 1996 (v.13#1) pg. 35

Circuit for a sound-activated switch. Just a clap of your hands twice, or almost any other quick double sound within a one-second interval, will activate operation.
POPULAR ELECTRONICS [2] Jan 1998 (v.15#1) pg. 68

Whistle-activated switch circuit will close a relay to control an external load.
POPULAR ELECTRONICS [2] Sep 1998 (v.15#9) pg. 56

Special microphone incorporates an audio compressor and VOX circuit. It will turn on your recorder at the sound of a voice and keep the recording level automatically adjusted.
POPULAR SCIENCE Oct 1973 (v.203#4) pg. 134

Circuit for a sound-activated light dimmer.
RADIO-ELECTRONICS Jan 1980 (v.51#1) pg. 66

Voice-operated switch (VOX) for your tape recorder.
RADIO-ELECTRONICS Nov 1983 (v.54#11) pg. 68

Sound-activated AC switch is inexpensive, reliable, and non-mechanical.
RADIO-ELECTRONICS Dec 1983 (v.54#12) pg. 38

Circuit to turn on a light whenever sound exceeds a preset level.
RADIO-ELECTRONICS Jan 1992 (v.63#1) pg. 12

Control that turns a lamp or other device off or on at the sound of a finger snap or soft whistle. Controls 100 watts or more, depending on the relay.
SCIENCE & ELECTRONICS [1] Feb-Mar 1970 (v.28#1) pg. 57