Image: TTL Clock
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Description: A digital clock/calendar built of TTL parts, designed in the late 1970's as a real-time clock for a process control computer. Because of the high current draw, the standby power was a 12 V 8 AH lead-acid battery. The photo shows some loose TTL chips and a well-known manufacturer's catalog of TTL parts. I made this picture all by myself. Please Mr. Copyright Bot, don't delete it. --Wtshymanski (talk) 15:02, 3 January 2011 (UTC)
Title: TTL Clock
Credit: Own work
Author: Wtshymanski
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
Image usage
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