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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.

Build

Here’s a quick demo..

clip

Notes

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.

Construction

Breadboard

Schematic

Build

Credits and References

About LEAP#426 Boldport7-SegmentCMOS/TTL
Project Source on GitHub Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

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!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

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.