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Subject: Beginner IC setup

Date: 01/07/02 at 8:35 PM
Posted by: Tom Wilson
E-mail: crazytbone@hotmail.com
Message Posted:

I need to figure out how to setup TTL logic networks with power coming out of a normal grounded home outlet. I have an AC adapter that works on 4.5 volts or 6.0 volts. I know that my TTL chips require 5.0 volts, and i've been told that 4.5 volts will probably suffice. The adapter also says "330mA max". Some of the model numbers are SN74AS04N, SN74ALS08N, and SN74ALS32N. When I hook up the chips on my breadboard all the outputs on the AND/OR outputs are permanently on, and the outputs on the inverted outputs are permanently off. Any assistance would be greatly appreciated, I need to know either how to correctly hook them up, manage the outlet power better, or at least figure out why all my outputs are fixed.
Tom Wilson

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