This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell. In the Notes below several options will be given in order to suit... [more]
circuit from:http://www.extremecircuits.net/2010/01/bells-ring-generator-circuit-schematic.html
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... [more]
circuit from:http://www.extremecircuits.net/2010/01/cuckoo-sound-generator-circuit.html
In Greek mythology, a siren was a demonic being (half bird, half woman). Later on this idea was transformed in art into a mermaid: a combination of a fish and a woman. Mechanical and electromechanical... [more]
circuit from:http://www.extremecircuits.net/2010/04/when-siren-sounds-useful-circuit.html
This multi-tone 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 CMOS oscillator-cum-divider IC... [more]
circuit from:http://www.extremecircuits.net/2010/05/multitone-siren.html
UM66 is a pleasing music generator IC which works on a supply voltage of 3V. the required 3V supply is given through a zener regulator. its out put is taken from the pin no1 and... [more]
circuit from:http://www.extremecircuits.net/2009/12/music-generator-schematic-using-um66.html
Do you long for a beach holiday on a tropical island, but you don’t have the necessary wherewithal? We’ve got just the answer: build the i-TRIXX surf simulator, put on your headphones, and dream yourself... [more]
circuit from:http://www.extremecircuits.net/2010/04/surf-simulator-circuit-diagram.html
Here is the simplest melody generator circuit you can make using an IC.The UM66 series are CMOS IC’s designed for using in calling bell, phone and toys. It has a built in ROM programmed for... [more]
circuit from:http://www.extremecircuits.net/2010/01/melody-generator-circuit-diagram.html
This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing... [more]
circuit from:http://www.extremecircuits.net/2010/04/pulse-generator-and-signal-tracer.html