Abnormal low current from JK flip flop IC at toggle mode

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SUMMARY

The discussion centers on troubleshooting low current output from a JK flip-flop IC (CD4027) used in a balance indicator prototype powered by a 12V battery. The user, Bbruyne, encountered issues with insufficient current to operate an Arduino Pro Mini and LED strips when toggling the flip-flop. Recommendations included verifying the output current specifications of the flip-flop, implementing hardware debouncing for the momentary switch, and using a PMOS power FET (NDP6020P) to effectively switch power to the load. The importance of understanding the threshold voltage and on-resistance of the PMOS was emphasized for optimal performance.

PREREQUISITES
  • Understanding of JK flip-flop operation and configurations
  • Familiarity with PMOS power FETs and their specifications
  • Knowledge of debounce circuits and techniques
  • Basic electronics concepts, including voltage, current, and resistance
NEXT STEPS
  • Research hardware debouncing techniques, focusing on RC circuits and Schmitt triggers
  • Study the datasheet for the NDP6020P PMOS FET to understand its operational parameters
  • Explore the use of oscilloscopes or multimeters for debugging flip-flop outputs
  • Learn about the implications of on-resistance (RDS(ON)) in power switching applications
USEFUL FOR

Electronics students, hobbyists building prototypes, and engineers working with digital logic circuits and power management solutions.

  • #31
just a suggestion, but why can't you poll the switch with the ardrino and use a small wait state loop to control debounce?
 
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  • #32
Doh! Because the whole point is to power on/off the arduino with a push button switch.
 
  • #33
Hello,

Here is how I finally did it! It works fine. Thanks a lot for your help. I learned a lot about a world that I didn't know about, electronics!

Thank you!

Bbruyne
 

Attachments

  • #34
Glad it works. That was a good idea, using the JK SET/RESET like an RS latch for debounce. I'll probably end up using that at some point.
 
  • #35
Great, thanks again for your help.

Bbruyne
 

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