Re: digital selector circuit

On 2 Sep 2006 11:04:45 -0700, in sci.electronics.design "arjay"
<bardoorian@xxxxxxxxxxxxx> wrote:

Hi to all!
New to this group, I pose a question: has anyone built or know of the
best and easiest way to
make a digital equivalent of a rotary switch? In a hobby application it
would be great to have a keypad or bcd thumbwheel/s to select one of a
number of output circuits. The limitation on rotary positions being
about 32, it would be nice to have a circuit that was expandable to
include a maximum of 100 positions. Output loads are 5v, 5-10ma, and
could have transistors to increase current if needed.
arjay
The first idea, off the top of my head, would be a shaft encoder,
maybe an optical one, driving an up-down counter, then some hc138 type
1 of many decoders.

But I'd cheat and use an 8051 or AVR, cos there maybe less soldering


martin
.

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