FREE
circuits!
Sound and oscillator circuit diagrams
October 1, 2010
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
October 1, 2010
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
October 1, 2010
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
September 30, 2010
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
September 30, 2010
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
September 30, 2010
This two-transistor white noise generator has a surprising feature – about 30dB more noise than the more traditional designs. Q1 and Q2 can be any small-signal transistors with a beta of up to 400. The... [more]
circuit from:http://www.extremecircuits.net/2010/04/simple-white-noise-generator.html
September 30, 2010
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
September 30, 2010
This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystals. Furthermore, assume that all diodes are shorts and their associated 1kO resistors open.... [more]
circuit from:http://www.extremecircuits.net/2010/05/switchable-output-crystal-oscillator.html
September 27, 2010
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
September 27, 2010
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
This category