Self sustaining (DC) RC circuit

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SUMMARY

The discussion centers on designing a self-sustaining DC RC circuit to drive LEDs that change color based on the charging and discharging of a capacitor. The user seeks assistance in selecting appropriate switches for the circuit, which will allow the LEDs to glow one color while charging and another color while discharging. Bipolar LEDs, such as red/green types, are identified as suitable components for this project due to their ability to display different colors depending on the direction of current flow.

PREREQUISITES
  • Understanding of RC circuit fundamentals
  • Knowledge of bipolar LED operation
  • Familiarity with DC power sources
  • Basic electronics skills for circuit assembly
NEXT STEPS
  • Research suitable switch types for RC circuits, such as MOSFETs or relays
  • Learn about the characteristics and wiring of bipolar LEDs
  • Explore capacitor discharge timing and its effect on LED brightness
  • Investigate circuit simulation tools to model the RC circuit behavior
USEFUL FOR

Electronics enthusiasts, hobbyists designing LED projects, and engineers interested in RC circuit applications will benefit from this discussion.

ahmed34234
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hi

i want to drive led's through a RC series (time constant) circuit, which is powered by a DC source and when the capacitor is fully charged,, the switches should be such that the capacitor will discharge automatically glowing the led's from opposite direction,

So the led's will give one colour when the capacitor is charging and will glow to another colour when it is discharging,,
The problem is ,, i m not able to find appropiate switches for my project :(

PLease HelP me out ,,
Thanks
 
Engineering news on Phys.org
Some LEDs are bipolar (e.g., red/green), and will glow one color when the voltage/current is in one direction, and another color when the voltage/current is reversed.
Bob S
 

Thread 'uA709 op amp compensation'

Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?
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