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Jet Aircraft Engine Sound Generator - This is a simple sound generator to produce jet engine aircraft sounds and it will run on any battery voltage between 3v and 40v. The circuit will produce 4 sounds : low speed sound of aircraft, high speed sound of aircraft, missile and machine gun. They are activated by connecting pins 12, 13, 14 or 15 to ground respectively. __ Designed by Popescu Marian
Machine Gun - This circuit produces a sound very similar to a machine gun:__ 555-Timer
Metronome - A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps. __ Designed by Andy Collison
Metronome & Pitch Generator - CMOS
IC 1 and IC 2B quad AND gate form a 2.4576 MHz crystal oscillator plus a 2400 times divider. IC 3A provides further division by 16, delivering a 64 Hz stable frequency square wave. This frequency is multiplied (by means of Phase Locked Loop IC 5, double decade divider IC 4 and IC 3B 4 bit binary divider) by the number set by three miniature BCD thumbwheel switches SW1, SW2 and SW3: units, tens and hundreds respectively. __ Contact Flavio Dellepiane, fladello @ tin.it
MIDI Drum Machine Analog Input Schematic - Schematic only __ Designed by Paul Stoffregen
MIDI Drum machine project - The MiDI Drum Machine began in the Fall of 1991 as a project for a microprocessor system design course, shortly after I wrote PAULMON1, the 8051 monitor/debugger. __ Designed by Paul Stoffregen
MIDI Generator - Control some MiDI device with ATtiny26. The code can be convert it for any AVR family microcontroller __ Designed by Vassilis Stergiopoulos
Mini Metronome - Linear scale Small size.40 to 208 beats per minute __ Contact Flavio Dellepiane, fladello @ tin.it
Model Train Diesel & Horn Sound Module - A good friend of mine having just retired acquired as a gift a small gauge miniature train set and asked me if I would design something to simulate a diesel electric sound and horn for it. Looking for shortcuts I researched many already-published designs most of which used a digital transmitter and receiver. Dissatisfied with all of them I decided to design a system for universal application for any system up to 20 volts. __ Designed by © Laurier Gendron, Burnaby, B.C., Canada
Module Gives Voice to PC - EDN Design Ideas: 05/26/94 The circuit in Fig 1 uses the iSD1020A voice-record/playback chip (information Storage Devices, San Jose, CA, (800) 825-4473) to allow an iBM PC to speak and hear. The analog part of the circuitry comes from the company's application notes. The host PC controls address inputs (A0 through A7) , Chip Enable (CE) , Playback/Record (P/R) , and Power Down (PD). The host also—supposedly—monitors End Of Message flag (EOM). Design by Jerzy R Chrzaszcz, Institute of Computer Science, Warsaw University of Technology, Warsaw, Poland
Multitone Alarm Sound Generator - Here the Multitone Alarm sound generator. This kind of multitone alarm is useful for security alarms, reverse horns, and so on. it generates five various sound tones and is also considerably more ear-catching when compared to a single-tone alarm.__
Multi-Tone Configurable Alarm - Presented here is a multi-tone configurable alarm that can be activated by temperature and other physical parameters. its output tone can be selected through different switch combinations. Such an alarm is...__ Electronics Projects for You
Multitone Siren - This multitone siren is useful for burglar alarms, reverse horns, etc. it produces five different audio tones and is much more ear-catching than a single-tone siren. The circuit is built around popular...__ Electronics Projects for You
NCO technique helps µC produce clean analog signals - EDN-Design ideas – April 15, 1999 [ NOTE: FILE has multiple design, scroll for this one.] 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 provide as an accurate dc output with 8 bits of resolution, it requires a filter with a low cutoff frequency to reduce the ripple to less than 1 LSB. Design by Steve Ploss, Veridian Corp, Wright Patterson AFB, OH
Parrot-Sounding AC Door Bell - Here is a mains-operated door-bell that produces parrot-like sweet voice without requiring any musical IC . The circuit is cheap and easy to construct. The AC mains is fed to the circuit...__ Electronics Projects for You
Police Car Siren - This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Precision Metronome & Pitch generator - Precision Frequency generator 1 to 999 Hz; Precision Metronome 1 to 999 beats per minute __ Contact Flavio Dellepiane, fladello @ tin.it
RF Synthesizer (CMOS
) - Synthesizer based on available CD4059. CD4046 and CD4060 IC s. __ Designed by Harry Lythall-SM0VPO
Simple Circuit Color Organ - A simple, satisfactory Color Organ can be built with a handful of cheap components. This design features: no mains supply transformer, built-in microphone and three widely adjustable frequency bands obtained by means of very simple, passive filters for Bass, Middle and Treble __ Contact Flavio Dellepiane, fladello @ tin.it
Simple Circuit Module Gives Voice to PC - 05/26/94 EDN Design Ideas: The circuit in Fig 1 uses the iSD1020A voice-record/playback chip (information Storage Devices, San Jose, CA, (800] 825-4473] to allow an iBM PC to speak and hear. The analog part of the circuitry comes from the company's application notes Design by Jerzy R Chrzaszcz, Institute of Computer Science, Warsaw University of Technology, Warsaw, Poland
Simple Interface for Digital Sound Synthesis - You can make a digital sound synthesizer, for experimentation with sound equipment or with peripheral devices, using special integrated circuits or digital-to-analogue converters (DACs). But here is a simple 8-input digital...__ Electronics Projects for You
Siren Simulator - This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Sound Effects Generator - This circuit uses a UM3561 IC to produce four different sound effects __ Designed by Andy Collison
Sound Effects Generator #2 - This circuit uses the Holtek HT2884 IC to produce 8 different sound effects __ Designed by Andy Collison
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