Tag Archives: sound

Spy Ear

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What binoculars do to improve your vision, this personal sound enhancer circuit does for listening. This light-weight gadget produces an adjustable gain on sounds picked up from the built-in high-sensitivity condenser microphone. So you can hear what you have been missing. With a 6V (4×1.5V) battery, it produces good results…. Read more »

Simple Door Bell Circuit

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Here this door bell circuit. this made around IC 8021-2. The sound is stored in a 4 bit ROM.a complementary-pair, two-transistor amplifier is used to amplify the sound to a fair level of audibility. A piezo tweeter or an 8-ohm, 500mW speaker can be used at the output. Here is… Read more »

20 watt Car Power Amplifier using TDA2004

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This circuit diagram we Power Amplifier IC TDA2004. Main features of this powerful package MULTIWATT ® (a trademark of SGS-THOMSON Microelectronics), where an IC chip power amplifier is designed specifically for car radio applications, is the ability of high current (3.5A) and the ability to drive a very low Impedance… Read more »

Electronic Siren

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This is Electronic Siren circuit diagram. The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off. When the push button switch is pressed to 10u capacitor will charge via the 22k resistor. This… Read more »