Texas Instruments SN76477

Pin assignment of the SN76477

The SN76477 is an analog sound chip introduced by Texas Instruments in 1978 with a wide range of applications. It is delivered in a 28-pin DIL housing .

use

Numerous tones and noises can be generated with the SN76477: music (mini organ, synthesizer), birds chirping, dog barking, whistling tones, siren tones, bells and ring tones, steam locomotive, diesel locomotive, car, airplane noises, gun shots, explosion noises, etc. Sound is generated by a noise generator with a downstream filter , a low-frequency, i.e. H. slower, oscillator ( abbreviated as LFO ) and a voltage controlled oscillator ( VCO ) that can be controlled by the LFO. There is also a rise / fall control, a mixer and various options for interconnecting the components. The setting of the frequencies and times is done analogously with capacitors and resistors. No microcontroller is required for control, and at the same time the technology used makes control with a microcontroller difficult.

A large area of application is in slot machines, but home computers such as the ABC 80 were also equipped with this sound chip.

literature

W. Hofacker: Complex Sound Generation with SN 76477 . Holzk., 1995, ISBN 3-921682-53-3 .
Imitator. An IC full of noise . In: Elektor . No. 3 , 1982, pp. 44–51 ( ZIP-packed pixel graphics of the article ( memento of October 11, 2011 in the Internet Archive )).
Sound box. Many effects in one box . In: Elektor . No. 12 , 1982, pp. 71–73 ( ZIP-packed pixel graphics of the article ).
SN76477. A complex sound chip - part 1 . In: ELO . No. 11 , 1980, pp. 67–68 ( ZIP-packed pixel graphics of the article ( memento of October 11, 2011 in the Internet Archive )).
SN76477. A complex sound chip - part 2 . In: ELO . No. 12 , 1980, pp. 57–58 ( ZIP-packed pixel graphics of the article ( memento of October 11, 2011 in the Internet Archive )).

Web links

Commons : SN76477 - Collection of Pictures, Videos and Audio Files

Wilhelm Scharenberg: Sound generator SN76477. Retrieved May 21, 2009 .
SN-76477. Archived from the original on February 13, 2012 ; Retrieved on May 21, 2009 (website with data sheets and various English and German articles on the SN76477).