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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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TONE GENERATOR sa DUAL-TONE MODULATED FREQUENCY sa MUSICAL INSTRUMENT -- ELECTRONIC x AUDIO TONE GENERATOR xx MUSICAL INSTRUMENT -- ELECTRONIC xx SIGNAL GENERATOR xx SOUND EFFECTS -- ELECTRONIC 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. Programmable music tone generator gives a sound similar to a clarinet. Use with any 8080-based system. Music theory for computer generated music and a musical tone generator interface. Est. cost (interface): $19. Computer music: A design tutorial. Build a simple, program-controlled digital tone generator. Capable of 30,000 possible pitches. 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. Vari-tone buzzer. Useful for locating each end of the same wire in a multi-wire cable. 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. 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. Tone generator circuit is built around two 555 oscillator/timer ICs. Useful for testing audio cables. 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. 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. 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. Transmitter test keyer. Automatic/manual microphone keying device (and tone injector) simplifies bench testing of modulation and r-f amplifier sections of radio transceivers. 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. Circuit for an audio tone generator with a 1 KHz output and level of 0.005 to 0.01 volts. Build a crystal-controlled musical instrument tuner. An accurate source of 440 Hz, A above middle C. Random tone generator can provide 256 separate tones, all in same key. More circuits using the 555 IC timer include (1) tone generator, (2) code practice oscillator, (3) CW monitor and (4) electric-eye annunciator. Circuit for a warbling tone generator. Simple one-octave tone generator. 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. 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. Tone sequencer circuit uses three CMOS chips to provide a sequence of up to ten individually programmable tones. 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. Simple VFO (variable frequency oscillator) circuit can be used for audible-tone testing, driving someone nuts, or a simple electronic musical instrument. Tunable tone generator circuit uses a horseshoe magnet to vary the output frequency. Two simple tone-generator circuits make use of the piezo buzzers' internal oscillators to produce a tone signal output. 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. Dual-tone generator for CB radios can insert a distinctive tone into the audio sections of a circuit under test. 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. Three-tone generator circuit. Two tone generator circuits with adjustable frequencies that work from 6- to 15-volts DC. 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. 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. Monophonic music maker. Part 1. Learn solid state circuitry as you build a monophonic music maker. Electronic tone generator will play simple tunes. Monophonic music maker. Part 2. Add an automatic control system to start the device with one push of a button. Circuit for an electronic tone sequencer with variable tempo is built around a 555 timer IC. 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. Electronic circuit to produce simple musical notes and tones. Audio oscillator (audible tone generator) circuit capable of driving an eight-ohm speaker. Use as an alarm, microphone tester, etc. Simple multi-tone waveform generator circuit. 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. 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. 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. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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