battery-operated instrument

Electrolarynx — A battery operated instrument that makes a humming sound to help laryngectomies talk. * * * n. a battery powered electrical vibrator that helps people to speak after laryngectomy. * * * elec·tro·lar·ynx (e lek″tro larґinks) artificial… …   Medical dictionary

Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …   Wikipedia

Electronic amplifier — A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In… …   Wikipedia

Puerto Rican scientists and inventors — The discoveries and contributions which have been made by Puerto Rican scientists and inventors in their respective fields have impacted the way of life of the inhabitants of Puerto Rico, and in many cases society in general. Hundreds of years… …   Wikipedia

Bazooka — Infobox Weapon name= Launcher, Rocket, Antitank, M 9 Series caption= M9A1 Bazooka with larger M20 Super Bazooka origin=flagcountry|United States type= Recoilless rocket antitank weapon is ranged=yes is explosive=yes is artillery=yes service=… …   Wikipedia

Electroluminescence — Animation of LCD, both unlit and with electroluminescent backlight switched on …   Wikipedia

Calculator — For mechanical precursors to the modern calculator, see mechanical calculator. For other uses, see Calculator (disambiguation). An electronic pocket calculator with a 7‑segment LCD display, that can perform basic arithmetic operations …   Wikipedia

Kurzweil K250 — The Kurzweil K250 a.k.a. Kurzweil 250 , K250 or K 250 , manufactured by Kurzweil Music Systems was the first combined live performance and studio electronic musical instrument which produced sound derived from sampled sounds (see:Sampler (musical …   Wikipedia

Pipette — A pipette (also called a pipet, pipettor or chemical dropper) is a laboratory instrument used to transport a measured volume of liquid.Use and variationsPipettes are commonly used in chemistry and molecular biology research as well as medical… …   Wikipedia

Operational instruments of the Royal Observer Corps — Main article: Royal Observer Corps ROC post observers in an underground monitoring post during a Cold War training exercise. The BPI dial can be seen in the background with a teletalk, FSM radiac instrument and a WB400 receiver on the desk The… …   Wikipedia

Pulse oximeter — A finger mounted pulse oximeter taking measurement through the fingernail. A wrist mounted remote sensor pulse oximeter with plethysmogram. A puls …   Wikipedia