What is the HP 200A audio oscillator?
What is the HP 200A audio oscillator?
The HP 200A was the first product 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.
What is audio frequency oscillator?
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave or a triangle wave. An audio oscillator produces frequencies in the audio range, about 16 Hz to 20 kHz.
When was the HP 200A audio oscillator invented?
January 26, 1939
Bill’s technical drawing of the HP 200A audio oscillator dated January 26, 1939. Bill and Dave started their business together and named it with the toss of a coin. They built the first Hewlett-Packard oscillators in Dave’s rented garage on Addison Avenue in Palo Alto, California.
Which oscillator can be used for audio frequency generation?
Phase Shift and Wein-bridge oscillators are used to generate audio frequencies, i.e. frequencies in AF Range. Crystal Oscillators are used where high-frequency stability is required.
What is a wide range oscillator used for?
An audio oscillator is an instrument that generates one pure tone or frequency at a time. Through the years, HP oscillators were used to design, produce and maintain telephones, stereos, radios and other audio equipment.
Which was one of the first customers of HP audio oscillator?
The company established its reputation as a maker of sophisticated instrumentation. Its first customer was Walt Disney Productions, which purchased eight audio oscillators to use in the making of its full-length animated film Fantasia (1940).
Which is not a low frequency oscillators?
Which of the following oscillator cannot be used in low frequency oscillations? Explanation: Since Colpitts oscillator is an LC oscillator it cannot be used as a low frequency oscillator.
What is changed by audio frequency oscillator?
The oscillator will be provided with a frequency range selection switch for coarse frequency change. A fine frequency control is also provided. The output of the sine wave oscillator goes to the amplifier. The amplifier amplifies the signal generated by the oscillator.
Which oscillator is suitable for frequencies in the range of megahertz?
LC oscillators
Explanation: Only LC oscillators are suitable for MHz range.
What is Hewlett-Packard HP originally known for?
HP was founded by Bill Hewlett and Dave Packard in 1939. Their first product was an audio oscillator and one of their first customers Walt Disney. Disney used the oscillator to test audio equipment in the 12 specially equipped theaters showing Fantasia in 1940.
Who is the owner of Hewlett-Packard?
Hewlett-Packard
Hewlett-Packard Development Company, L.P./Parent organizations
Which of the following is a low frequency oscillator?
Low-frequency oscillation (LFO) is an electronic frequency that is usually below 20 Hz and creates a rhythmic pulse or sweep. This is used to modulate musical equipment such as synthesizers to create audio effects such as vibrato, tremolo and phasing.
What is the lowest frequency hp oscillator?
The lowest-frequency HP oscillator using the RC, Wien-bridge tuning circuit concept of Bill Hewlett is the Model 202B which operates from 1/2 Hertz to 50 kHz, in four ranges. To tune down to 0.5 Hertz, using a variable capacitor as the tuning element, requires a very large value for this capacitor in the oscillator circuit.
What is the output voltage of a 209a oscillator?
For audio, the three 20 Hz – 20 kHz ranges are ideal, while the lowest range covers infrasonics. The higher ranges are best for interfering with AM radio broadcasts. Output source impedance is 600 Ω, and output open-circuit sine-wave voltages range from 260 mV (-11 dBV) to 11 V RMS (21 dBV), as tested. Rear, HP 209A Oscillator. enlarge.
What is the origin of the Hewlett Hewlett oscillator?
At the origin of the story is this audio oscillator built by Bill Hewlett for his Stanford University thesis project in 1938. It is a resistance tuned oscillator covering from 35 cps (frequency unit was the cycle at this time) to 35,000 cps in 3 ranges.
What is the best general-purpose audio oscillator?
The Hewlett-Packard HP 209A is probably the world’s most useful and versatile general-purpose audio oscillator. You’d be hard pressed to pay more than $100 for it at eBay (see How to Win at eBay).
