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'[PIC:] Microchip sounds chips???'
2004\05\29@222358 by Charles Craft

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I thought they just brought over the microprocessors from General Instruments.


The datecode on the package looks like 8826.

http://en.wikipedia.org/wiki/AY-3-8912

A Programmable Sound Generator (PSG) chip manufactured by General Instruments, used in various 1980s home microcomputers including the Sinclair ZX Spectrum 128, the Timex Sinclair TS2068 and the Amstrad CPC 464, 664 and 6128.
<snip>


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3 pieces of MICROCHIP Sound IC AY-3-8912. These IC's are a must for Arcade Game Repairs and are perfect for a Repair Shop / School / Hobbyist.

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'[PIC:] Microchip sounds chips???'
2004\06\26@093114 by Phil Seaford
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Does anybody know of the sound chip used to produce the seatbelt warning
sound ('ding') used in most vehicles these days?
There must be as lot about!

Something very similar is used on aircraft as a general attention alarm.

Phil Seaford

In message
<.....3327142.1085883775411.JavaMail.rootKILLspamspam@spam@wamui03.slb.atl.earthlink.net>,> Charles Craft <chuckseaspamKILLspamMINDSPRING.COM> writes
{Quote hidden}

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2004\06\28@151049 by John N. Power

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> From:         Phil Seaford[SMTP:EraseMEPhilspam_OUTspamTakeThisOuTMAGSTRIPE.DEMON.CO.UK]
> Sent:         Saturday, June 26, 2004 9:20 AM
> To:   PICLISTspamspam_OUTMITVMA.MIT.EDU
> Subject:      Re: [PIC:] Microchip sounds chips???

> Does anybody know of the sound chip used to produce the seatbelt warning
> sound ('ding') used in most vehicles these days?
> There must be as lot about!

> Something very similar is used on aircraft as a general attention alarm.

> Phil Seaford

The basic chime sound is a damped sinusoid. There are two variables
involved. The first is the continuous frequency being damped or
exponentially modulated. High frequencies give a tinny or metallic
sound, while low frequencies sound like hitting wood. The second
parameter is the decay time of the envelope. A short decay time
sounds like a thud or "plink", depending on the basic frequency,
while a long decay sounds like a chime or bell.
Two such sinusoids can be  summed for more complex sounds,
like chords.
An analog multiplier can be used as a modulator to impose a
simple RC wave on a continuous sine wave.

John Power

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2004\06\28@153442 by David W.S. King

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All of the aircraft we did efis systems on used "Sonalerts" to make
the
various beeps and whistles. There are much much cheaper alternatives
to that brand name ie non-certified. The volumes and sounds produced
can all be varied.

Dave

> {Original Message removed}


'[PIC:] Microchip sounds chips???'
2004\07\01@092939 by Roland
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At 02:20 PM 26/06/04 +0100, you wrote:
>Does anybody know of the sound chip used to produce the seatbelt warning
>sound ('ding') used in most vehicles these days?
>There must be as lot about!
>
>Something very similar is used on aircraft as a general attention alarm.

you can make a very similar sound by applying a single pulse to a DC
buzzer(built in driver) through a cap. Sound will vary accordibng to kind
of buzzer, voltage applied, size of cap. The sound will taper off as the
cap charges up.


pic  >-------||---------<|--  diode
                    |     |
                    |     |
                 +  -     |
         buzzer     O     |
                 -  -     |
                    |     |
                   _|_____|_ 0V



Regards
Roland Jollivet

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