[Arm-netbook] EOMA-68 tablet/laptop/engineering-board PCB schematics design underway

[luke.leighton]

On Wed, Nov 7, 2012 at 6:02 PM, luke.leighton <luke.leighton at gmail.com> wrote:

> just one thing... does anyone know of a circuit using Op-Amps where i
> could do a 2nd stage volume control that would increase the gain, even
> if it was only 2 bits (one bit increasing the sensitivity by x5 and
> another say increasing by x20 or something)?  or maybe a PCM output,
> levelled out by a capacitor, then used as the volume control (i'm
> concerned about running out of pins on the STM32F)

http://hackmeopen.com/2011/04/voltage-controlled-amplifier/

 yaaaay!  it's even designed originally for an 8-bit microcontroller
where the resolution is, obviously, limited, as well as the pin-count
of the controller, so he's pulling the same trick: PCM.

 awesome.

l.