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Electronic dice logic level labelling...

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Teach-In 2011 (Archives) » Electronic dice logic level labelling error. « Previous Next »

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james
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Username: james

Post Number: 26
Registered: 02-2007

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Posted on Tuesday, 16 November, 2010 - 09:32 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Hi,

To avoid confusion I'd just like to highlight an error in the logic level labeling in the Electronic die circuit diagram featured in part 1 of Teach-In 2011 on Page 57 in the November issue of EPE.

I think that the logic levels labeled on the inputs to IC2a, IC2b, IC1a, IC1b and IC3a should all be the opposite to those shown.

This is because the counter, IC4 counts from 0 to 5 and resets on 6. Therefore, for example, when '4' is shown on the LED's the counter should be at a count of '3' or 011, not '4' or 100 as shown on the circuit diagram.

If you look closely the NOT gate, IC3a has a logic level of '0' on both input and output, a situation which should never arise.

The logic levels shown on the outputs of the NOT gates driving the LEDs are correct as labeled.

Cheers

James
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mike_tooley
:::: Super User ::::
Username: mike_tooley

Post Number: 6
Registered: 10-2010

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Posted on Tuesday, 08 February, 2011 - 07:01 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

In fact, the circuit of the electronic die was simply given as an example of what a circuit looks like when displayed in Circuit Wizard. It was not intended to be built by readers - nor to be discussed in the text. This was only the first part of the series and was just intended to introduce readers to what the software looks like. Incidentally, the circuit is an example within Circuit Wizard - it's not one of our own circuits!
--
Mike Tooley - EPE Teach-In 2011

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