Although sophisticated spying technology is available for purchase that uses contact microphones and amplifiers to listen through walls, it's also possible to create a listening mechanism using a small drill and plastic wrap. Because of the way the plastic wrap vibrates as sound passes through it, the sound wave travels faster as it goes through the hole, allowing for focused and efficient transmission of the sound.Know More
Drill an extremely small hole in the wall. A hole that is smaller than the wavelength of the sound waves involved permits more sound to pass through.
Stretch plastic wrap across the drilled hole on the listening end.
Listen through the plastic wrap to the sound on the other side of the wall. Recording devices can also be set up to record the sounds.
If an amplifier contains only its original parts, it is possible to identify when the amp was made either online, through an expert or by using the Blue Book of Guitar Amplifiers.Full Answer >
It is possible to put songs on an iPod without iTunes by using other software that allows for the transfer of music from a computer to the device. There are alternatives to iTunes available for Windows, Linux, and OSX systems.Full Answer >
While pre-made LED assemblies designed to flash in time to music are available, it is also possible to make a custom LED light that will flash to the beat of a speaker using simple electronics equipment such as an Arduino microcontroller board, wire, resistors and solderless beadboard. This project may also require familiarity with some computer programming languages such as Java, and it may also require additional equipment such as a USB cable, a computer and individual LEDs in the desired colors. In some cases, detailed instructions for building a sound-sensitive LED assembly will include download links for the necessary software programs that will enable the LEDs to blink in time with music.Full Answer >
It is possible to connect a 6-ohm speaker to an 8-ohm amp. While the internal impedance of the speaker is 6-ohms, the output impedance of an amplifier is essentially zero. This is due to the active control circuitry in modern amplifiers that makes impedance matching in electronics unnecessary.Full Answer >