On Wed, May 1, 2024 at 06:54 PM, Glenn Little wrote:
Hi Glenn,
Unfortunately, replacing the "74S..." series logic gates is almost always a lottery win.
In circuit design, normally, the 74S series is used due to the higher speed of its logic gates and therefore a very fast step response, you can try with an equivalent code of the 74LS series (low consumption S series), but sometimes they are not fast enough (low consumption means greater slowness), if after replacement you should encounter operating defects or a degradation of the instrument's characteristics, you should search on eBay for a logic gate from the old 74S series.
kind regards... Loris IW4AJR
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73 de IW4AJR Loris
Loris Bollina