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?
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\$\begingroup\$ If you press on it, does it 'detent' a bit like a switch would? \$\endgroup\$– jonkJan 24, 2022 at 16:57
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\$\begingroup\$ @jonk pressing the yellow button feels like it is a a mechanical switch. if that's what you're asking. \$\endgroup\$– earlJan 24, 2022 at 16:59
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\$\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\$– jonkJan 24, 2022 at 17:07
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\$\begingroup\$ why are you asking? \$\endgroup\$– jsotolaJan 24, 2022 at 19:27
1 Answer
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\$\begingroup\$ Any ideas as to what type of IC it is, given the circuit description? \$\endgroup\$– earlJan 24, 2022 at 17:00
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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\$– virJan 24, 2022 at 17:04
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1\$\begingroup\$ @tristenlee I could speculate but, what's the point? Where does that help? \$\endgroup\$– Andy akaJan 24, 2022 at 17:05
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\$\begingroup\$ If it isn't working right, and a new battery doesn't fix it, then the chip likely failed. \$\endgroup\$– rdtscJan 24, 2022 at 17:42