Eric Smith wrote:
Ethan Dicks wrote about the COSMAC Elf:
To guess, I know of one common issue with
hand-made 1802 designs -
the 4016 and 4066 are not 100% interchangable. They have different
switch response characteristics. ISTR the older designs used 4016
switches which are harder to find now than 4066 switches.
It's certainly true
that the 4016 and 4066 have differences in their
characteristics. However, in the simple way in which it is used in
the Elf, I can't see how it would make any difference. I can't say
that I've actually tried it, though.
According to Don Lancaster's CMOS Cookbook the 4066
"This is an improved version of the 4016, having a lower on resistance.
However, the 4016 remains a better choice for ultralow-leakage
applications such as sample-held circuits."
John :-#)#
If not that,
then the other issue to investigate is to ensure that
the input button is debounced
Yes, that is quite important.