>: I am wanting to use a 16C84 to provide volume control to a simple audio
>: amplifier (microphone input, speaker output).
>:
>: I already have the 16C84 connected to an LCD driver using an I2C (IIC)
>: bus, and an elegant solution seems to be to use an I2C audio preamp.
>:

>: The trouble now is finding a (UK) supplier. Some of these devices have
>far
>: more functions than I need (I only want [mono] volume control!).
>: The only one I have managed to locate is the TEA 6300 (which has many
>: features and a large price tag [8 pounds]). The *'d items are the
>: simplest, most suitable and hopefully cheapest [around 2 pounds?].
>:
>: Does anyone know where (in the UK) I could get these?
>:
>: Alternatively, can anyone suggest any other methods for providing volume
>: control?


Try the AD2161 from analog devices.  It's not crude, but it will give you
ultimate control.  It's a digitally controllable volume control.  Takes 3
digital lines to control and attenuates 4 channels of audio at 100dB S/N.
Alternatively, you could use the digital pots from National Semiconductor.
I forget the part name on these, but they have a similar digital interface
in a one channel, 8 pin part.  Seems like the National parts would work best
if you are worried about cost.

Stuart Allman
studio@halcyon.com