Silent Q

Azog's little slice of the world. Whee.

TTL clock

Posted By on August 1, 2008

So, the madman who brought you the transistor clock kit has a new kit. This time, it’s a TTL clock.

For this kit, we’ve moved from discrete components into the 74LSxx series TTL chips, which reduces size considerably. There are very few discrete components here, and those are mainly filter caps and resistors.

The kit was put together with the same quality as the transistor kit: a professional-looking printed manual, all bags of parts are clearly marked, solder and solder wick.

Beyond that, this is a fairly straight-forward build. Just make sure of the component orientation, and double-check your part numbers. A 74LS74 can easily (by me) be mistaken for a 74LS47. Luckily, the pin counts are different. I sat down at 4pm, and was finished at 6pm, and that included taking breaks, etc.

You’ll notice a piece of red wire around the fat cap. That was my fault. My soldering iron got too close to the zip tie, and it melted. I’ve got zip ties around here somewhere…

The size comparison between the transistor version and the TTL version is just amazing.

Since TTL is the “next generation” after discrete transistors, it’ll be interesting to see what, if any, his next kit will be. The next-gen after TTL was basically VLSI and above. Myself, I’d like to see a previous-generation, which would be tubes, or back even to relays. But I think tubes and/or relays would be cost prohibitive, not to say power-hungry.


Comments

2 Responses to “TTL clock”

  1. Wendi Beccaria says:

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  2. azog says:

    Well thank you Wendi. You’ll notice I removed the spam from your automated bot comment.

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