HP200A Audio Oscillator
The HP200A is Hewlett-Packard's first product. It is a low-frequency generator assembled according to a resistive-capacitive circuit in 1939, a conventional incandescent lamp was used as a nonlinear feedback element. Immediately 8 such devices were acquired by Walt Disney to test the sound equipment when creating the animated film "Fantasy" [1] [2] .
Notes
- ↑ Timeline: History of Hewlett-Packard . Fox News Channel (February 9, 2005). Date of treatment October 11, 2015.
- ↑ A real gem: HP's audio oscillator patent turns 60 . Early Instruments . Hewlett-Packard (January 22, 2002). Date of treatment October 11, 2015.