That looks more like it. I was thinking of using a 1PxT rotary switch, but with these ICs it looks like I need 2PxT, to switch one each of the row and column inputs. But that raises another possibility - might I be able to use a keypad of some sort, with a latching buffer, to provide the required 4-digit codes?
73, Pete At 03:47 PM 5/9/2008, [EMAIL PROTECTED] wrote: >On 9 May 2008 at 8:15, Pete Smith wrote: > > > Another consideration might be hardware related. I am planning to use a > > 74HC147 to control the Xtall, but it only covers 0-9. I am trying to have > > a switch control with 9 positions, but 15 and 10 will be outside the range > > of the IC. Does anyone know of an off-the-shelf IC that does 16-to-4 > > binary encoding? I have been unsuccessful in finding one. > > > > 73, Pete N4ZR > > > Sorry, my last reply was for the wrong direction. I think a 16 key > encoder like the 74HC922 >would work. > >Dave - WB6DHW ><http://wb6dhw.com> > > >------------------------------------ > >Yahoo! Groups Links > > >
