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µC generates musical sounds - 04/15/99 Issue of EDN Many
modern devices send audible signals to their operators to indicate some of
the predetermined conditions or states of the system under control. To avoid
annoying human sensibilities, these sounds should match the musical scale.
Several chips on the market....Page includes several designs. Scroll
to find this one.... [Design Idea by Abel Raynus, Armatron International,
Melrose, MA]/ |
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Add speech encoding/decoding to your design - 02/04/99 Issue of
EDN 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...[Design Idea by Rodger Richey, Microchip Technology
Inc, Chandler, AZ] |
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AN-587: Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers -
AN-587-Analog Device Application Notes....[App Note]
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AN-605: Synchronizing Multiple AD9852 DDS-Based Synthesizers -
AN-605-Analog Device Application Notes....[App Note]
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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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ASM 1 Analog Synthesizer Module - (electronic schematic / circuit added
4/02) |
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CMOS RF Synthesizer - Synthesizer based on available CD4059. CD4046 and
CD4060 ICs…. [from Harry Lythall's website] |
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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.... [Tony van Roon's circuit] |
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HV857 EL Lamp Driver Circuits for Low Audible Noise - Supertex
Semiconductors (app note added 6/06) |
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Improved CMOS RF Synthesizer - Lock range extended up to about 400:1 (50KHz,
2MHz). Spectral purity improved, reduced reference frequency FM ripple. Output level
buffered to over 200mW RF power output. Unecessary DIP switches removed, silly
combinations not possible. BMP format single-sided PCB foil available for downloading.
External VCO/Prescaler PCB to follow shortly (up to 150MHz) … [from Harry Lythall's
website] |
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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) [Circuit by Stepan Novotill] |
| NCO technique helps µC produce clean
analog signals - 04/15/99 Issue of EDN 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, 1998, pg 108]. The method involves generating a
PWM output with a controlled duty cycle and filtering the switching waveform with a
simple single-pole RC filter. Although this method provides an accurate....Page
includes several designs. Scroll to find this one....(EDN Design Ideas]
[Design Idea by Steve Ploss, Veridian Corp, Wright Patterson AFB, OH] |
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Paradoxical Sound Synthesizer - the main property of paradoxical sounds is
that their frequency do not change when you go an octave higher (added 5/02)
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Poor Man's DDS Synthesizer - A very simple version of the DDS synth, using
just the 2313 and a resistor network. This does not use chip from Analog Device.
It's controlled over RS232 from a small Windows program, and can generate Sine-,
Sawtooth-, Trangleand Sqare-waves ranging from 0.07) Hz to about 200-300 kHz in 0.07)
Hz steps. (added 10/05) |
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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 -
Add this easy project to your regular scanner or DX'ing apparatus and never miss
action again. Or use this system to check a range of frequencies for band
activity when you're not there. I use it to check a range of 'secret'
frequencies overnight when I'm sleeping. Works for me.... [Tony van Roon's
circuit] |
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Sound Effects Generator - This circuit uses a UM3561 IC to produce four
different sound effects… [Andy Collison] |
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Sound Effects Generator #2 - This circuit uses the Holtek HT2884 IC to
produce 8 different sound effects… [Andy Collison] |
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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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Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers - AN-587-Analog
Device Application Notes....[App Note] |
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Synchronizing Multiple AD9852 DDS-Based Synthesizers - AN-605-Analog Device
Application Notes....[App Note] |
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SYNTHESIZER BASICS - A Phase Locked Loop (PLL) consists of a Voltage
Controlled Oscillator (VCO), the output frequency of which is monitored and
controlled. An error voltage steers the VCO and brings it back onto the correct
frequency. The error voltage is generated by a Phase Sensitive Detector (PSD) which
compares the VCO frequency with a reference frequency. ….... |
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Synthesizer Basics - Very nice intro to synthesizers…. [by Harry Lythall] |
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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.….) [Luhan Monat - Mesa Arizona] |
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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) [Luhan
Monat - Mesa Arizona] |
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Talking Morse Code Practice Computer - [Ken Staton's website] |
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Talking Phone Dial Monitor - Speaks the numbers that you dial as you dial
your telephone. 5 pages. Not available as a kit of parts. [free schematic from
Golab.com] |
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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 - A novel supply voltage monitor which uses a LED to
show the status of a power supply. [by Miroslav Adzic - Serbia & Montenegro] |
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Wave Multiplier for music Synthesizers - (electronic circuit added 4/05)
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