battery-driven oscillator
41Charge pump — 2 stage charge pump with DC voltage supply and a pump control signal S0 A charge pump is a kind of DC to DC converter that uses capacitors as energy storage elements to create either a higher or lower voltage power source. Charge pump circuits… …
42Geophysical MASINT — is a branch of Measurement and Signature Intelligence (MASINT) that involves phenomena transmitted through the earth (ground, water, atmosphere) and manmade structures including emitted or reflected sounds, pressure waves, vibrations, and… …
43Guitar amplifier — Mesa Boogie Mark IV, a guitar combo amplifier A guitar amplifier (or guitar amp) is an electronic amplifier designed to make the signal of an electric or acoustic guitar louder so that it will produce sound through a loudspeaker. Most guitar… …
44Magic eye tube — EM11 tuning eye A magic eye tube gives a visual indication for audio output, radio frequency signal strength, or other functions. It is also called a cat s eye, or tuning eye tube. These tubes were used by radio receivers from around 1936 onwards …
45Tuning fork — A tuning fork is an acoustic resonator in the form of a two pronged fork with the tines formed from a U shaped bar of elastic metal (usually steel). It resonates at a specific constant pitch when set vibrating by striking it against a surface or… …
46Macintosh 128K/512K technical details — The original Macintosh was a relatively simple machine, now of interest for its simplicity and for the fact that it was the first computer produced by Apple under the name Macintosh. The Macintosh used standard off the shelf components to the… …
47electronic instrument — ▪ music Introduction any musical instrument that produces or modifies sounds by electric, and usually electronic, means. The electronic element in such music is determined by the composer, and the sounds themselves are made or changed… …
