Electronics > Projects, Designs, and Technical Stuff
Bistable Flip/Flop circuit second LED required. (Solved).
(1/1)
Jim-0000:
I have this little circuit wired up and operational for indicating the state of a device which will be either activated or not.

http://www.circuitbasics.com/555-timer-basics-bistable-mode/

It is working and doing part of the task required.
It shows the LED on until it is triggered via a 4N25 opto coupler.
All good.
Except that the user would like a (different colour)  light on when the 555 flip flop was in the other (or second) state.
Can someone advise where a second LED should be wired into this circuit to indicate the alternate stable state please?

Jim.
Zero999:
Connect another LED between pin 3 and the positive power supply, via a suitable current limiting resistor.
Jim-0000:
Thanks for the prompt reply. I will give it a try this morning.

Edit:

I just tried it as suggested by zero and it all works fine!
I'll mark this thread as solved.
Navigation
Message Index
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod