can someone recommend a thyristor

i don't have alot of experience with them but it seem to be exactly what i need.

i have a device that has a constant current of 3v as a continuity test that i can wirelessly get to momentarily jump to 9v for 3 seconds before dropping again. i would like to use it to hook up to the LEDs around my back yard so i can turn the lights off around the grill, gazebo or where ever the kids leave them on at. I believe if i understand correctly a thyristor is basically an electric switch, apply a certain amount of voltage once, it closes the circuit, lights on, do it again, opens the circuit, lights off. Do i understand this correctly and can i get a recommendation on which thyristor would work best?

by goofoff5
November 15, 2021

If a thyrstor (SCR, silicon controlled rectifier) is controlling a dc circuit it will turn on when a voltage pulse is applied to the gate. Once turned on it will not turn off until the dc (not the gate) is turned off.

by Foxx
November 15, 2021

so that means that as as long as there is power going through the gate from the power source not the 9v source of the voltage pulse, it will stay on....

i have 2 terminals that can deliver the 9v pulse that stay at 3v constantly. what if i put a PNP transistor between the power source and the thyristor. If i deliver a pulse to it, it should cut the DC power to the thyristor, resetting it to be turned on again?

by goofoff5
November 15, 2021

No No No A short voltage pulse on the gate turns the thyristor on and it stays on for evermore even after the gate pulse goes back to zero. The only way to turn it off is to remove the power source.

by Foxx
November 15, 2021

See the illustration circuit at

by Foxx
November 15, 2021

No Answers

No answers yet. Contribute your answer below!

Your Answer

You must log in or create an account (free!) to answer a question.

Log in Create an account

Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

Search Questions & Answers

Ask a Question

Anyone can ask a question.

Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.

About This Site

CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.

We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.

Acceptable Questions:

  • Concept or theory questions
  • Practical engineering questions
  • “Homework” questions
  • Software/hardware intersection
  • Best practices
  • Design choices & component selection
  • Troubleshooting

Unacceptable Questions:

  • Non-English language content
  • Non-question discussion
  • Non-electronics questions
  • Vendor-specific topics
  • Pure software questions
  • CircuitLab software support

Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.