SN76477N

[Rick Jansen]

In message <17EE050230 at LuStuDat.student.lu.se> you write:
> A few years ago I came across a couple of chips called SN76477N, and only
> yesterday a friend of mine
> said he had two as well and he gave them to me.. I remember them as being
> some sort of oscillator-chips, but can't remember.
> I searched on the web but only found some text-index of a book where the
> chip had been used in some percussion unit
> and up and down tone generator circuits.. Does anyone care to explain what
> exactly I have here or where I can find some
> info about them. Manufactured by Texas Instruments btw...
> Thanks in advance...

The is contains (this is from memory) a 555-type MMV "oscillator", 
which you program with R/C combinations, an LFO, a filter (R/C programmable)
and a noise source.

It's a chip for sound effects like bird's whistles, steam trains, phaser
guns etc, I don't think it was meant for musical instruments per se.

It was also "one of the first I2L chips", IIL, Integrated Injection Logic,
a technology I haven't heard of since really. 

Rick Jansen
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rick at sara.nl   http://www.sara.nl/Rick.Jansen
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