How Can BCD Switches Be Used as a Clock Source on a PCB?

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SUMMARY

BCD switches can be utilized as a clock source on a PCB by implementing specific circuit techniques. To recover a clock signal from BCD outputs, a debouncer should be applied to the "1" signal if using mechanical switches. Additionally, an AND circuit can be employed with the "8" and "1" signals to generate a clock signal that transitions at "9". Alternatively, the "8" signal can be used alone to capture the negative transition for clock recovery.

PREREQUISITES
  • Understanding of BCD (Binary-Coded Decimal) encoding
  • Knowledge of debouncing techniques for mechanical switches
  • Familiarity with digital logic circuits, specifically AND gates
  • Experience with clock signal generation in electronic circuits
NEXT STEPS
  • Research BCD switch configurations and their applications in digital circuits
  • Learn about debouncing circuits and their implementation in PCB design
  • Study the design and function of AND gates in digital logic
  • Explore clock signal generation techniques using various electronic components
USEFUL FOR

Electronics engineers, PCB designers, and hobbyists interested in integrating BCD switches as clock sources in their projects.

mahdert
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Can anyone please explain to how one can use a set of BCD switches on a PCB and use them as a clock source?

Thanks.
 
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mahdert said:
Can anyone please explain to how one can use a set of BCD switches on a PCB and use them as a clock source?

Thanks.

Doesn't make sense on the face of it. A clock source would have to be an active circuit. A switch is generally a passive electromechanical device.
 
If you need to recover a clock signal from 1-2-4-8 BCD signals, put a debouncer on the "1" signal (if it is a mechanical switch) and then a x2 multiplier (exclusive OR with a delay in one input).

If you want to recover a clock signal from the "carry" output of the BCD, put the "8" signal and the "1" signal into an AND circuit. This signal goes TRUE at "9" and FALSE on the next input clock signal. You also can use the "8" signal alone and carry on the negative transition.

Bob S
 
Last edited:

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