0
\$\begingroup\$

I was hoping someone could identify what (type) of component is used in this LED circuit that runs off a 3V coincell battery. It's rather simple: press the button and the LED switches on indefinitely until the button is pressed again. Is it some type of relay?

pic enter image description here

\$\endgroup\$
4
  • \$\begingroup\$ If you press on it, does it 'detent' a bit like a switch would? \$\endgroup\$
    – jonk
    Jan 24, 2022 at 16:57
  • \$\begingroup\$ @jonk pressing the yellow button feels like it is a a mechanical switch. if that's what you're asking. \$\endgroup\$
    – earl
    Jan 24, 2022 at 16:59
  • \$\begingroup\$ I just wanted to be absolutely sure. It's a button, of course, and the black blob is just a cheap way of protecting a chip on that board. It's probably a simple IC circuit or even a cheap MCU, possibly, whose only job is to monitor the switch and operate the LED. Without subjecting the chip to a very detailed scan, there's no way to tell more. \$\endgroup\$
    – jonk
    Jan 24, 2022 at 17:07
  • \$\begingroup\$ why are you asking? \$\endgroup\$
    – jsotola
    Jan 24, 2022 at 19:27

1 Answer 1

Reset to default
0
\$\begingroup\$

Hopefully this should be clear enough: -

enter image description here

Is it some type of relay?

No, it isn't (that's for sure).

\$\endgroup\$
4
  • \$\begingroup\$ Any ideas as to what type of IC it is, given the circuit description? \$\endgroup\$
    – earl
    Jan 24, 2022 at 17:00
  • 1
    \$\begingroup\$ Some sort of toggle circuit, no doubt. There are fancy purpose-made ICs that include debounce as well but I don't think this one has it. There also might be current limiting built in but as it's running off a coin cell they could probably get away without it. It might even just be a flip flop. \$\endgroup\$
    – vir
    Jan 24, 2022 at 17:04
  • 1
    \$\begingroup\$ @tristenlee I could speculate but, what's the point? Where does that help? \$\endgroup\$
    – Andy aka
    Jan 24, 2022 at 17:05
  • \$\begingroup\$ If it isn't working right, and a new battery doesn't fix it, then the chip likely failed. \$\endgroup\$
    – rdtsc
    Jan 24, 2022 at 17:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.