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Subject: Re: Beginner IC setup

Date: 01/23/02 at 11:39 AM
Posted by: Jem
E-mail: Jemidar@hotmail.com
Message Posted:

In Reply to: Beginner IC setup posted by Tom Wilson on 01/07/02 at 8:35 PM:

Seems to me like you have a power supply problem. When an ordinary AC adapter says 4.5V DC output, the unloaded DC voltage can be anywhere from 6V to 9V. In other words, the DC voltage is not well regulated. TTL chips get damaged (and operate inconsistently) once their VCC is exceeded. I suggest you use one of the cheap 7805 regulators to get 5V regulated DC.By the way, the 74 series (LS, ALS, AS, S etc.) series are TTL chips, and unterminated inputs always assume a logic 1 level.Hope that helps...Jem

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