I've been doing some thinking about the "shunt resistor" volume control that's seen a lot arround here. A lot of designs use resistors connected to ground (via a relay or transistors), but only use ONE at the time. This works, but offers 10 to 16 steps at most...
Now, how came no one ever tried to use multiple resistors to ground? As they parallel, the volume shunt would be smaller... this would allow a huge number of steps (128 for 7 resistors), and could be driven more or less directly digitally (perhaps NOT gates would be needed). Now, i haven't done the maths on this one, but what do you think?
Now, how came no one ever tried to use multiple resistors to ground? As they parallel, the volume shunt would be smaller... this would allow a huge number of steps (128 for 7 resistors), and could be driven more or less directly digitally (perhaps NOT gates would be needed). Now, i haven't done the maths on this one, but what do you think?