How can I make a 8-3 encoder using 4-2 encoders?

[flake]

I really don't understand how, if anyone can help it would be much appreciated

 

[betwixt]

It is extremely difficult with analog circuits, a digital design would be MUCH easier.
Brian.

 

[flake]

I have to use 4-2 encoders though, along with any other modules I might need.
will I need a multiplexor in there somewhere?

 

[lostinxlation]

Encoder spec isn't as determinate as decoder. More specifically, when input=0000, what output gets is left to the designer and unless you clarify it, no one can answer your question.

 

[flake]

um well I'm assuming lower indices on the inputs have higher priority..if it's 0000 I think I just make the output V

 

[lostinxlation]

I don't know what 'V' you are referring to is and there is no such thing as a priority in a simple encoder.

A 4-2 encoder has only 2 bit outputs which can tell which one of 4bits is on, but having 8bit inputs, none of the 4bits could be '1' which makes the possible input patterns 5. Apparently, 2 bit outputs isn't enough.

Again, unless you make your encoder spec clear, no asnwer can be given.