> A quick 'n dirty way of remote controlling volume that I have used in
> the past (with great success) is to use an LDR (LDR's for stereo) with a
> small 6Volt grain of wheat lamp sandwiched between them and shoved into
> some cable insulation and driven direct from an I/O pin
>
> The attack /decay times are slow and are well suited for audio and the
> signal is also Opto isolated so no problem with earth loops.
>
> Because the response time is slow you could PW modulate the lamp at very
> slow rate, 10Hz would be your lower limit

Is there any reason you didn't use an LED instead of an incandescent?  The
LED would take less current for the same brightness, is more rugged, should
last much longer, and is probably cheaper.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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