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µC generates musical sounds - 04/15/99 EDN-Design Ideas: [Note: File contains
multiple circuits. Scroll to find this one] Many modern devices send
audible signals to ir operators to indicate some of predetermined conditions or
states of system under control. To avoid annoying human.....(design idea added
6/06) |
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2-Input Mixer - As simple as it gets. mixer consists of two transistor-based
preAmplifiers. first one (designated "Mike in") offers higher gain. it works
well with a regular dynamic microphone. second one can be used to control audio
input from a tape recorder/CD player. (added 6/06) |
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2m-20m Transverter - This little circuit is a transmitting and receiving converter
(transverter) that converts a FT290 or similar multimode handheld transciever to the
14MHz amateur band. The project is a single board module that needs an external local
oscillator, for example, the VHF harmonic oscillator (or QRP VHF FM TX) LO for
transverter project. It should be a relatively simple matter of scaling coils(circuit
/ schematic design added 6/06) |
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9-Pin PC Serial Port to MIDI Synthesizer Interface Cable - (circuit / schematic
design added 6/06) |
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Acoustic Simulation Plug-in for Winamp (MP3) Players - A freeware plug-in called
"Speakers Simulator" for the Winamp MP3 player that simulates a natural soundfield in
headphones. The program employs a Fast Fourier Transform (FFT) filter which is
compensated to avoid Comb effects. The crossfeed delay ....Designed by Vladimir Kopjov
(circuit design added 04/05/06) |
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Add Speech Encoding/Decoding to Your Design - 02/04/99 EDN-Design Ideas:
Adding speech capabilities to a design can sometimes lead to complex algorithms and
expensive DSPs or specialized audio chips. However, with completion of a
simplified adaptive differential pulse-code-modulation (ADPCM)algorithm, you can now
implement se audio capabilities in low-cost 8-bit µCs,.....(design idea added 6/06) |
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Amiga MIDI Interface - (circuit / schematic design added 6/06) |
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AN-663: Sound Effects for the COP800 Family - National Semiconductor Application
Note (app note added 2/06) |
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Analog MIDI Synthesizer - (electronic circuit added 4/05) |
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AN-H43: HV857 EL Lamp Driver Circuits for Low Audible Noise - Supertex
Semiconductors (app note added 6/06) |
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Apple Mac to MIDI Synthesizer Interface Cable - (circuit / schematic design added
6/06) |
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ASM 1 Analog Synthesizer Module - (electronic schematic / circuit added 4/02) |
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Audible Train Approach Warning - This is a circuit that will give an audible
warning that a train is entering a particular section of track. The detector also has
a LED that indicates when a train is entering or leaving the block…(circuit /
schematic design added 6/06) |
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Automatic School Bell - Circuit / schematic (added 02/05) |
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Birdie Doorbell Ringer - (Tony van Roon's circuit / schematic design added 6/06) |
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Call Sign Annunciator - (electronic design added 09/06) |
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Canary Sound Effect (Stepan Novotill) - Reverse engineered circuit diagram of a
commercial Electronic Bird. This one was built into a plastic christmas ornament and
runs off a 9V battery. Note that L1 is actually just an audio transformer with an
unused secondary winding. (added 10/04) |
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Car Back-up Alarm - The brake lights of automobile trigger this circuit on
and off. This save annoyance of alarm when it is not needed.
This is an older circuit which was published in Popular Electronics Magazine, but
still a good circuit today. (Tony van Roon's electronic design added 6/06) |
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Cuckoo sound Generator - This circuit generates a two-tone effect very much alike
the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in
audio amplifier and loudspeaker. Used as a sound effect generator it can be
connected to external amplifiers, tape recorders etc. In this case, the built-in audio
amplifier and loudspeaker may be omitted and the output taken from C8 and
ground.….(circuit design added 08/08) |
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Digital Call Sign Annunciator - (electronic design added 09/06) |
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Dog Whistle - (circuit / schematic added 3/-3) |
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Electronic canary - This circuit is a modified hartley oscillator with a couple of
extra components included. The transformer is a small audio transformer, type LT700.
The primary is center tapped with an impedance of 1Kohms at 1KHz . The secondary has
an impedance of 8 ohms...(electronic circuit added 2/07) |
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Electronic Canary Doorbell - This circuit is a modified "Hartley Oscillator" with
a couple extra parts. T1, the LT700 (Tony van Roon's or equivalent, is a small
center tapped (Tony van Roon's ct) audio transformer with an impedance of 1000 ohms at
1000 hertz. The secondary of this transformer has an impedance of 8 ohms.
Usually noted as 1K:8 ct. I tried a couple other models like the red and green
... (Tony van Roon's electronic design added 6/06) |
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Electronic Canary Sound Effect (Stepan Novotill) - Reverse engineered circuit
diagram of a commercial Electronic Bird. This one was built into a plastic christmas
ornament and runs off a 9V battery. Note that L1 is actually just an audio transformer
with an unused secondary winding. (added 2/05) |
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Graphic Equalizer Pro - A shareware graphic equalizer program that operates in
real-time. Can adjust any sound source (such as the CD player) available on the PC's
soundcard mixer menu. See A Quick Guide To Headphone Accessories for tips on using an
equalizer with headphones. Requires Windows 9x/Me/NT/2000/XP. Designed by ANWIDA
Soft (circuit design added 04/05/06) |
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Happy Birthday Singer solar engine - Time-Controlled Solar Engine: The original
Type 2 Solar Engine was based around the "Happy Birthday Singer" (HBS) chip that was
pulled from the original Hallmark singing greeting cards. . (added 6/06) |
| HV857 EL Lamp Driver Circuits for Low Audible Noise
- Supertex Semiconductors (app note added 6/06) |
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Metronome & Pitch Generator - (circuit added 9/04) |
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Metronome Circuit - This circuit uses a couple of Op-amps to produce an
interesting sound effect. The left hand CA741 is wired as a standard astable and
produces the timing pulses, controlled by C1, R2 and VR1. The output is fed via
C2 to the second op-amp and is also direct coupled via the zener ZD1 to Q1.....added
10/05) |
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MIDI Drum Machine Analog Input Schematic - (electronic circuit added 4/05) |
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MIDI Drum machine project - (electronic circuit added 4/05) |
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MIDI Generator - Control some MIDI device with ATtiny26. The code can be convert
it for any AVR family microcontroller..….(circuit design added 03/09) |
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Model Train Diesel & Horn Sound Module - TIL 112 opto isolator, 741, LM566 VCO,
CD4017 CMOS counter, LM386 power amplifier, LM556 dual timer (electronic
schematic / circuit added 4/02) |
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NCO technique helps µC produce clean analog signals - 04/15/99 EDN-Design Ideas: A
recent Design Idea described a method for producing an analog voltage from one digital
output of a µC ("Generate an analog signal with a µC," EDN,Oct 22, 98, pg 108). The
method involves generating a PWM output with a controlled duty cycle and filtering the
switching waveform with a simple.....(design idea added 6/06) |
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Noisemaking Circuits (police siren & chime) - (added 08/08/08) |
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Old-fashioned siren effect - (circuit added 6/07) |
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Paradoxical Sound Synthesizer - (electronic Circuit / Schematic added 10/04) |
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Precision Metronome & Pitch generator - Precision Frequency generator 1 to 999 Hz.
Precision Metronome 1 to 999 beats per minute (added 3/05) |
| Scanmate Audio Activated Recorded - (Tony van Roon's
schematic / circuit added 10/02) |
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Serial Port to MIDI Synthesizer Interface Cable - (circuit / schematic design
added 4/05) |
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Simple module gives voice to PC - 05/26/94 EDN-Design Ideas: (design idea added
6/06) |
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Sound Effects for the COP800 Family - National Semiconductor Application Note
(app note added 2/06) |
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Sound Effects Generator - This circuit uses a UM3561 IC to produce four different
sound effects…(added 07/07/07) |
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Sound Effects Generator #2 zen22142 - (electronic schematic / circuit added 4/02) |
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Sound Effects Generator 2 - This circuit uses the Holtek HT2884 IC to produce 8
different sound effects…(added 07/07/07) |
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Sound Effects Generator zen 22142 - (electronic schematic / circuit added 4/02) |
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Speech Recognition using HM2007 - (circuit / schematic design added 6/06) |
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Star Trek "Red Alert" siren - This circuit simulates the "Red Alert" siren from
the TV show Star Trek. It uses two 555 timers in the circuit. The 555 on the right is
wired as an alarm tone generator and the second 555 timer on the left is wired as a
1.5 second non-symmetrical astable that generates a fast rising but slow falling saw
tooth waveform. This waveform is buffered by ....(circuit design added 05/08) |
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Talking Fish Hack - These items were sold nationally several years ago. The fish
would sing, open its mouth, turn its head, and flap its tail. After removing the back
panel, all of the existing electronics were removed leaving only the 3 servo motors,
speaker and photocell.….(circuit design added 08/08)) |
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Talking Frog Box - This device 'listens' to a conversations and then interjects
words and phrases at inappropriate times….(design added 08/08/08) |
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Talking Phone Dial Monitor - (electronic circuit added 4/05) |
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Talking PIC Based on SP0256 - (electronic circuit added 4/05) |
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Talking Voltmeter - Ever needed to measure a voltage without taking your eye off
something? If so, then this is the project for you! The Orton Talking Voltmeter takes
a voltage measurement in the range 0-5 Volts and then reads it out to you to two
decimal places (i.e. to 10mV resolution). The design illustrates the use of the 10 bit
ADC in the PIC, .....(added 04/04/04) |
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Talking YODA project PIC16C84 - (electronic circuit added 4/05) |
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Ultrasonic Dog Whistle - (electronic design added 11/06) |
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Wave Multiplier for music Synthesizers - (electronic circuit added 4/05) |
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WaveSong - A shareware PC application that generates nature sounds (rain, surf,
crickets, thunder, pink noise, white noise) which are relaxing to hear and help mask
ambient noise when played through headphones or loudspeakers. Requires Windows
98/95/NT4.0/2000/ME. Designed by Jim Sells (Sagebrush Systems) (circuit
design added 03/08) |
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Weird Sound Generator - (electronic circuit added 08/08/08) |
