Re:555 timer teardown: inside the most popular IC (2016)
by timonoko on Friday June 05, 2020 @09:11AM
(#23428080)
I do remember time when 555 was too expensive and exotic for everyday use. There was standard way to implement same functionality with NANDs using all the gates in SN7400, but cannot find it now in the Interwebbs. Especially when Russians started to make 7400 look-a-likes with 2 millimeter pin spacing.
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Re:555 timer teardown: inside the most popular IC (2016)
by kjs3 on Friday June 05, 2020 @08:20PM
(#23435544)
You could implement some types of multivibrators with NANDs, and oscillators with pretty loose specs, but I'm not sure you could do everything that a 555 could do. The 555 definitely had more precision. But people do forget what could be done with a couple of very simple gates.