Cricket Chirping Generator - Funny gadget for props and jokes.5, 12V Battery operation. __ Contact Flavio Dellepiane, fladello @ tin.it
Cuckoo-song Generator - This circuit generates a two-tone effect very much alike the cuckoo song. 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 across C8 and ground. __ Contact Flavio Dellepiane, fladello @ tin.it
Dog Whistle - it's well known that many animals are particularly sensitive to high-frequency sounds that humans can't hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz. __ Designed by Tomaz Lazar-Ljubljana, Slovenia
Dual-Tone Horn - This circuit generates two different frequencies and mixes these to produce a balanced ringing tone, which can be used in burglar alarms or call bells. The circuit uses a dual-timer IC LM556__ Electronics Projects for You
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 types (Tony van Roon's taken out of a $5 made-in-china am pocket radio) and they both work good. You may have to adjust the caps to get the sound __ Designed by Tony van Roon VA3AVR
Electronic Canary Sound Effects - An electronic version of a chirping canary. May be used as an alarm, a sound effects generator or perhaps a replacement doorbell __ Designed by Andy Collison
Electronic Chime - Scroll Down to find this circuit. This circuit simulates a chime similar to the sound many cars make when the keys are left in the ignition. The bottom two gates form a squarewave audio oscillator that drives the base of the 2N4401, turning it on and off at an audio rate. The top two gates produce a short low-going pulse about once per second that discharges the 10 uF capacitor through the diode. The voltage then jumps up and slowly decays __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Electronic Dog Whistle - Need electronic dog whistle? it is widely known that dogs can hear sounds with frequencies higher than the humans cant hear. Sound frequencies higher than 20 kHz can be hardly detected by humans but animals are very sensitive to it. Basing this fact, an electronic dog whistle can be constructed and used to call dogs back from __ Designed by D Mohankumar
Electronic Metronome - A metronome is used by musicians for practice in maintaining a consistent tempo, or rubato, around a fixed beat. This circuit produces a regular beat at the rate of 40 to__ Electronics Projects for You
Electronic 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 Volker Jeschkeit
Emergency 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.
Infra Red Switch - This is a single channel (on / off) universal switch that may be used with any infra Red remote control using 36-38kHz. (This is a very common remote handset frequency). In place of iR1 a TSOP1738 receiver may be used. __ Designed by Andy Collison
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
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
Model Train Horn (2-tone) - With this circuit you can electronically simulate the noise of a diesel-train horn. The sound is triggered automatically as the train reaches a desired place on the track so you can produce the sound as the train approaches stations, level crossings, etc. The circuit can be built simply by using one 556 or two 555 timers __ Designed by Tony van Roon VA3AVR
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.
Rain sound effect Generator - Agreeable, relaxing effect, helping to fall asleep; Small portable unit, 3V battery powered __ Contact Flavio Dellepiane, fladello @ tin.it
Robot Voice Generator Project - Those of you who imagine that a robot voice generator box would require a whole heap of ICs are mistaken; the iSD2500 ChipCorder family of ICs from Winbond contains almost all the necessary hardware in a single IC to record and playback audio messages. Included on the IC is a microphone preamp and AGC suitable for a low-cost __ Designed by Popescu Marian
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
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
Starship Enterprise Door Sounder - Here's a project especially for trekkies. At the closure of remote switch contacts, it recreates that distinctive "ssshhhhhhh-thump" sound of the sliding doors opening or closing on the "Starship Enterprise". Use it for generating sound effects for your own sci-fI movies or for hooking up to a bedroom or wardrobe door so you can pretend you're aboard the "Enterprise" in deep space, going where no man has gone before! __ SiliconChip
Two-Tone Train Horn - With this circuit you can electronically simulate the noise of a diesel-train horn. The sound is triggered automatically as the train reaches a desired place on the track so you can produce the sound as the train approaches stations, level crossings, etc. The circuit can be built simply by using one 556 or two 555 timers __ Designed by Tony van Roon VA3AVR
UM3561 Siren Generator Design - UM3561 is an excellent ROM IC that can generate MultI siren tones simulating Police siren, Ambulance siren, Fire brigade siren and Machine gun sound. This 8 pin low power IC can work down to 2.4 volts. The UM 3561 is a low cost siren generator designed for use in toy applications. The IC has an inbuilt oscillator and tone __ Designed by D Mohankumar