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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
Many times we have found itself in the necessity to use a Zener diode and cannot to know the voltage of operation. Many times we cannot read the characteristics or the type that is written... [more]
September 30, 2010
This circuit is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. The device formed by Q1, Q2 and related resistors triggers the SCR. Timing is provided by R1, R2 &... [more]
circuit from:http://www.extremecircuits.net/2009/08/ac-220-volts-flashing-lamps-circuit.html
September 30, 2010
People often forget that many voltage regulator ICs have an upper limit (usually 35 V) on the input voltage they can handle. That applies primarily to types with a fixed output voltage. Adjustable voltage regulators... [more]
circuit from:http://www.extremecircuits.net/2010/05/protection-for-voltage-regulators.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 circuit idea is certainly not new, but when it comes to making a trade-of between using a small, short-circuit proof transformer or a capacitive voltage divider (directly from 230 V mains voltage) as the... [more]
circuit from:http://www.extremecircuits.net/2010/05/12v-fan-directly-on-220v-ac.html
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