I feel absolutely old-fashioned what with my vario speaker velcroed to
the top of my glare shield and my radio speaker mounted to the bulkhead
behind my right ear. But, hey! It works.

On 2/27/2015 12:00 AM, Bruce Hoult wrote:
On Friday, February 27, 2015 at 6:40:28 PM UTC+13, Paul B wrote:
On Friday, 27 February 2015 15:05:45 UTC+10, Bruce Hoult wrote:

Now you're getting fancy :-)
Thanks Bruce

The fancy is what I want to avoid, as the initial idea was to simplify things - i.e. one speaker instead of four .
Well, the good news is all those bits (except volume controls with knobs) would cost less than $10 in total and fit on a board a maximum of a couple of square inches in size.

Heh. These days you could use a $2 ATtiny85 microcontroller in an 8 pin DIP package. 20 MHz CPU. 3 10 bit analog to digital inputs. Scale and add them digitally. Output a pulse-width modulated 1 bit signal at 50 KHz or so, low pass filter (i.e. a resistor and a capacitor), then to the amplifier.

https://learn.sparkfun.com/tutorials...ny85-use-hints

OK, I'm being silly.

--
Dan Marotta