simple analog switches
hello friend,
I've been working on a digital volume control. The cheapest and easiest way was to raise the ground of the load and use a counter conected to a 8->1 analog switch and finally a darlington driver to pull down the load and a series resistor to real ground. Works fine and can be implemented with CMOS logic with a 3V3 lihtium cell / super capacitor and still have memory!!!! you can implement with any number of taps....
I hope this helps...
regards,
2000