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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.


The warbler (a tone oscillator that periodically sweeps through 1/3 octave bands). A clever test technique for speakers in rooms uses an audio signal generator and a sound level meter.
AUDIO AMATEUR 1/1979 [Feb 1979] (v.10#1) pg. 22

Programmable music tone generator gives a sound similar to a clarinet. Use with any 8080-based system.
BYTE Sep 1977 (v.2#9) pg. 84

Music theory for computer generated music and a musical tone generator interface. Est. cost (interface): $19.
BYTE Dec 1977 (v.2#12) pg. 48

Computer music: A design tutorial. Build a simple, program-controlled digital tone generator. Capable of 30,000 possible pitches.
BYTE Mar 1981 (v.6#3) pg. 317

A tone generator is constructed on a paper business card (instead of a printed circuit board) using surface-mount technology. Seventeen small metal fingers can be depressed to change the output tone.

Simple multi-tone generator circuit incorporates an interactive LED and phototransistor to help determine the waveform shape, frequency, and amplitude.

Steady 1,000 cps sine wave tone source for testing microphones.
ELECTRONICS ILLUSTRATED Nov 1965 (v.8#6) pg. 70

Vari-tone buzzer. Useful for locating each end of the same wire in a multi-wire cable.
ELEMENTARY ELECTRONICS May-Jun 1969 (v.8#2) pg. 49

Play simple tunes on this tone generator. Basically it is a beefed-up code practice oscillator where the leads of various resistors are pressed against a bare copper wire to change the note produced.
ELEMENTARY ELECTRONICS Mar-Apr 1974 (v.14#2) pg. 64

Tone-modulated transmitter. Use it as a hidden transmitter for kids to track down using a portable radio. Use it as a code-practice oscillator.
HANDS-ON ELECTRONICS Apr 1987 (v.4#4) pg. 88

Tone generator circuit is built around two 555 oscillator/timer ICs. Useful for testing audio cables.
HANDS-ON ELECTRONICS Mar 1988 (v.5#3) pg. 95

Unusual uses for solid-state piezo-transducers. (1) Fixed-frequency generator circuit. (2) Sound-activated decoder circuit. (3) Low-frequency crystal filter circuit. (4) Tone encoder/decoder circuit.
HANDS-ON ELECTRONICS Jan 1989 (v.6#1) pg. 84

Hearing tester. Circuit for a variable tone generator which lets you set the frequency from about 400 Hz to 20 kHz. A switch then reduces the sound by 10 dB as you step through each of 12 positions. Use it to test your level of hearing as compared to others. Est. cost: under $10.
MODERN ELECTRONICS [1] Feb 1978 (v.1#1) pg. 49

Unconventional ultraminiature circuits. Using conductive inks and adhesives to interconnect surface-mountable components. Circuits include: (1) Business card tone generator. (2) Boardless LED tone transmitter. (3) Boardless LED transmitter.
MODERN ELECTRONICS [2] May 1987 (v.4#5) pg. 70

Transmitter test keyer. Automatic/manual microphone keying device (and tone injector) simplifies bench testing of modulation and r-f amplifier sections of radio transceivers.
MODERN ELECTRONICS [2] Feb 1989 (v.6#2) pg. 56

Multi-master. Solid-state multivibrator module is used in this tester which generates a 1000-Hz tone, richly endowed with harmonics. Can be used as a signal generator, code practice oscillator, and continuity tester. Est. cost: $5.
POPULAR ELECTRONICS [1] Jan 1967 (v.26#1) pg. 75

Circuit for an audio tone generator with a 1 KHz output and level of 0.005 to 0.01 volts.
POPULAR ELECTRONICS [1] Jul 1968 (v.29#1) pg. 69

Build a crystal-controlled musical instrument tuner. An accurate source of 440 Hz, A above middle C.
POPULAR ELECTRONICS [1] Dec 1972 (v.2#6) pg. 55

Random tone generator can provide 256 separate tones, all in same key.
POPULAR ELECTRONICS [1] Mar 1974 (v.5#3) pg. 58

More circuits using the 555 IC timer include (1) tone generator, (2) code practice oscillator, (3) CW monitor and (4) electric-eye annunciator.
POPULAR ELECTRONICS [1] Jul 1974 (v.6#1) pg. 50

Circuit for a warbling tone generator.
POPULAR ELECTRONICS [1] Aug 1974 (v.6#2) pg. 98

Simple one-octave tone generator.
POPULAR ELECTRONICS [1] Sep 1974 (v.6#3) pg. 93

A review of versatile multifunction ICs, including Intersil's 8038 waveform generator, and National's LH0094 multifunction converter. Includes circuits for tone-burst generator, audio oscillator, precision multiplier and divider circuits.
POPULAR ELECTRONICS [1] Jan 1979 (v.15#1) pg. 77

Universal tri-state tone generator can operate in three modes: steady, warbling sound and two-tone. Two circuits using 556 IC dual timer chip. Use in alarms or annunciators.
POPULAR ELECTRONICS [1] Oct 1979 (v.16#4) pg. 113

Tone sequencer circuit uses three CMOS chips to provide a sequence of up to ten individually programmable tones.
POPULAR ELECTRONICS [1] Nov 1979 (v.16#5) pg. 117

A circuit for a light-sensitive tone generator. The output frequency of this oscillator will rise and fall in response to light falling on its two photocells.
POPULAR ELECTRONICS [1] Dec 1981 (v.19#12) pg. 106

Simple VFO (variable frequency oscillator) circuit can be used for audible-tone testing, driving someone nuts, or a simple electronic musical instrument.
POPULAR ELECTRONICS [2] May 1989 (v.6#5) pg. 86

Tunable tone generator circuit uses a horseshoe magnet to vary the output frequency.
POPULAR ELECTRONICS [2] Feb 1990 (v.7#2) pg. 87

Two simple tone-generator circuits make use of the piezo buzzers' internal oscillators to produce a tone signal output.
POPULAR ELECTRONICS [2] Jul 1990 (v.7#7) pg. 90

Collection of 555 oscillator/timer circuits. (1) Astable multivibrator. (2) Modified astable. (3) Add-on LED dual-flasher circuit. (4) Add-on high-power dual-lamp flasher circuit. (5) DC-to-DC converter. (6) Dual-tone generator.
POPULAR ELECTRONICS [2] Jan 1994 (v.11#1) pg. 72

Dual-tone generator for CB radios can insert a distinctive tone into the audio sections of a circuit under test.
POPULAR ELECTRONICS [2] May 1995 (v.12#5) pg. 30

Voice recording and playback. Using the ISD1000A Direct Analog Storage Technology integrated circuit to construct a variety of circuits capable of storing and playing 20-seconds of audio. Part 2. Includes a tone-controlled lock and a tone generator.
POPULAR ELECTRONICS [2] Aug 1995 (v.12#8) pg. 74

Three-tone generator circuit.
POPULAR ELECTRONICS [2] Jul 1996 (v.13#7) pg. 65

Two tone generator circuits with adjustable frequencies that work from 6- to 15-volts DC.
POPULAR ELECTRONICS [2] Jun 1997 (v.14#6) pg. 70

Experimenting with the 4093 NAND Schmitt trigger. Circuits include oscillator, signal injector, fluorescent-light inverter, fluorescent flasher, Morse code sender, beep-tone generator, LED flasher, and timer.
POPULAR ELECTRONICS [2] Feb 1998 (v.15#2) pg. 50

Circuit for a light-operated variable-pitch amplifier produces an audio output tone whose pitch is proportional to the light falling upon a unique infrared light-to-frequency converter IC.
POPULAR ELECTRONICS [2] Oct 1998 (v.15#10) pg. 62

Monophonic music maker. Part 1. Learn solid state circuitry as you build a monophonic music maker. Electronic tone generator will play simple tunes.
RADIO-ELECTRONICS Jan 1979 (v.50#1) pg. 62

Monophonic music maker. Part 2. Add an automatic control system to start the device with one push of a button.
RADIO-ELECTRONICS Feb 1979 (v.50#2) pg. 74

Circuit for an electronic tone sequencer with variable tempo is built around a 555 timer IC.
RADIO-ELECTRONICS Jul 1980 (v.51#7) pg. 73

Circuit for a VHF tone transmitter. Useful as a RF signal generator that can be used for simple checks of TV and FM radio RF, IF, and AF stages.
RADIO-ELECTRONICS Dec 1980 (v.51#12) pg. 100

Electronic circuit to produce simple musical notes and tones.
RADIO-ELECTRONICS Apr 1985 (v.56#4) pg. 40

Audio oscillator (audible tone generator) circuit capable of driving an eight-ohm speaker. Use as an alarm, microphone tester, etc.
RADIO-ELECTRONICS Aug 1986 (v.57#8) pg. 83

Simple multi-tone waveform generator circuit.
RADIO-ELECTRONICS Nov 1987 (v.58#11) pg. 31

A business-card tone generator uses surface-mount technology. Illustrates how to form resistors simply by drawing them in place with a graphite pencil. Seventeen "keys" produce different pitched tones.
RADIO-ELECTRONICS Nov 1987 (v.58#11) pg. 85
Correction RADIO-ELECTRONICS Feb 1988 (v.59#2) pg. 14

CMOS phase-locked loops (PLL's). An in-depth look at a particularly versatile CMOS IC, the 4046B micro-power CMOS phase-locked loop. Includes circuits for sound generator, square-wave generator, tone switch, etc.
RADIO-ELECTRONICS Dec 1989 (v.60#12) pg. 55

Simple battery-powered oscillator circuit (tone generator) for identifying audio cables (speaker, microphone, etc.) when connecting them up. Ideal when installing sound systems for live events. Est. cost: $5.
RADIO-ELECTRONICS Dec 1991 (v.62#12) pg. 12