audio article

The Door buzzer sound circuit was two-tone sound. With the switch S1. working of circuit,The IC1 is a frequency dividing circuit, and generator a sound frequency came out.by the C1, R1 are the frequency generator. This audio signal from pin 7 and pin 4 into the pin 1 and pin 8 of the IC2a, IC2c [...]

Philips in-Ear Headphones Crystal Sound SHE9620/28 Rose Gold * Philips in-Ear Headphones Crystal Sound SHE9620/28 Rose Gold * Ultra thin diaphragm delivers clarity and detail sounds Angled Acoustic Pipe channels directional and precise sound * Exceptional noise isolation for quality sound at low volume * Ergonomics in-ear design for the best comfort and sung fil [...]

LED or bulb switch off with a puff Funny gadget – 3V Battery supply This design was developed by request of a correspondent having made a sort of LED candle and needing to switch off the LED with a puff. This simple, easy to build gadget can be useful as a prop for Halloween and [...]