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Project Notes

#426 Boldport 3x7 RippleTester

Using some 4000 series counters (CD4017, CD4060) to exercise the digits and segments of the Boldport 3x7.


Here’s a quick demo..



After building the Boldport 3x7 I thought it would be nice to have a simple way to demonstrate that all the segments and digit controls are working correctly - without having to do it by hand or resort to plugging in a microcontroller.

So I whipped up this circuit on a breadboard using a CD4017 and CD4060:

  • the CD4060 is configured with an RC oscillator resulting in a first counter stage (Q4) frequency of about 6 Hz
  • seven CD4060 counter stages (Q4-Q10) feed the 3x7 segment pins a-g
  • the next CD4060 counter stage (Q12) is hooked to reset, and also provides the clock pulse to the CD4017
  • the CD4017 steps through output 0,1,2 and then resets it’s count
  • the CD4017 outputs 0,1,2 feed the 3x7 digit pins A, B, C

The result is a simple pattern that runs through all combinations of segments on each digit in turn.

Note: because the CD4060 does not expose Q11 counter stage, the pattern of segments actually runs twice on each digit before moving to the next.





Credits and References

About LEAP#426 Boldport7-SegmentCMOS/TTL
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LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

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Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.