1 Nov
2010
1 Nov
'10
10:45 a.m.
On 1 Nov 2010 at 13:11, Dan Roganti wrote:
That
part is wired internally as a Diode Terminator, not much left
over for a matrix, little flexibility there, it'll take more than 4
chips - and since the diodes are in a DIP, that counts as a chip ;)
Sure, all you need is 7 of these critters; each common-anode line is
an output, with the cathodes connected to the appropriate demux
output from the 154.
Didn't they make a straight Diode Pack w/o the
common anode or cathode
--which you commonly see - for wiring into a matrix for situations
like this ?
Yes, but not with an SN74xxx part number, which was my way of staying
within the ground rules of using only 74xx series logic.
--Chuck