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Problem:
| | The book shows digit 2 of the display coming from pin 13 of the 74LS138 (via a 470 ohm resistor) and digit 3 from pin 11. These are the wrong way round.
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Solution:
| | The connections for the digit drivers are connected to the resistors which come from the 74LS138 are as follows:
- pin 15 drives digit 1 (the tens of volts)
- pin 11 drives digit 2 (the volts)
- pin 13 drives digit 3 (the tenths of volts)
- pin 9 drives digit 4 (the hundredths of volts)
The resistors that are connected to pins 14, 12 and 10 of the 74LS138 are not needed and may be left out of the project.
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Other Projects:
| | This change does not affect the other projects.
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Further information:
| | I hope that this page helps you with your projects but if you have found any other problems or if you have any further questions please contact me though the email address of gares-AT-g4aym-DOT-org-DOT-uk.
Sorry about the email address but it seems to be the only way to avoid the spammers
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