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The HP 200A, first built in 1938, was the first product [1] made by Hewlett-Packard and was manufactured in David Packard's garage in Palo Alto, California. It was a low-distortion audio oscillator used for testing sound equipment. It used the Wien bridge oscillator circuit, that had been the subject of Bill Hewlett's masters thesis.
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Hewlett and Packard's first financially successful product was a precision audio oscillator known as the HP 200A, which used a small incandescent light bulb (known as a "pilot light") as a temperature dependent resistor in a critical portion of the circuit, and a negative feedback loop
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HP operate their business desktops on minimum 12-month product cycle. Their product line mainly competes with Dell OptiPlex , Acer Veriton , and Lenovo ThinkCentre . HP's market share for their business line of desktops in 2010 was estimated to be 18.7 percent in 2022.
Some companies do sell positive tempco thermistors but it is a very small market. All metals have positive tempcos. HP's 200A oscillator used a lamp with a metal filament to stabilize the Wein bridge oscillator because of its positive tempco. As the bridge current increases the lamp filament gets hotter, increasing its resistance.
Case closed. The HP 200LX Palmtop PC (F1060A, F1061A, F1216A), also known as project Felix, is a personal digital assistant introduced by Hewlett-Packard in August 1994. [1] [2] It was often called a Palmtop PC, and it was notable that it was, with some minor exceptions, a DOS-compatible computer in a palmtop format, complete with a monochrome graphic display, QWERTY keyboard, serial port, and ...
The O-200 is an updated and upgraded version of the engine, achieving increased power of 100 hp (75 kW) as a result of higher maximum rpm. The standard and most common model of the engine is the O-200-A; the -B model is designed for a pusher installation, the -C model provides for the installation of a controllable-pitch propeller, and the -D ...