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First for all. Am not an electrical enginner, am just an amateur artisan, pretending make intetesting gadgets.

So the situation is this. I need to make a circuit in a sheet of paper for just turn on and turn off a very very little led light. The challenge: make this as thin as possible. Ideally with 0.5mm of thickness.

What I already made: I found a very interesting example in this link https://www.electroschematics.com/5996/touch-switch-circuits/

But the problem is, again, the thickness, only the ic 555 has a 3.5 mm, for me its to much. In summary, is there another way to do this circuit but in a very very thin way?.

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  • \$\begingroup\$ You could get close. ti.com/lit/ds/symlink/lmc555.pdf Look at page 29. The max height of the DSBGS is 0.575mm. The problem is going to be attaching it and making sure that it's reliable. \$\endgroup\$ – vini_i Jul 9 at 20:07
  • \$\begingroup\$ how about a bare-die JFET? \$\endgroup\$ – analogsystemsrf Jul 10 at 3:30
  • \$\begingroup\$ 5 volts (safe for the human hand) and 100,000 ohms (between fingers)produces 50uA which should make a LED glow. \$\endgroup\$ – analogsystemsrf Jul 10 at 3:33
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If all you need is a very weak light, use a neon lamp and a safe, low current power supply. Bridging two conductive ink traces between the lamp and supply with a finger would light the lamp. Using audio-frequency or low frequency RF would make the circuit easier to turn on, since it would bypass skin resistance with capacitive coupling.

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0.5mm rules out most packaged ICs (that’s about the thickness of a sawn wafer.) If you could use chip-on-board it’s possible, or something in chip-scale packaging you might be able to make that.

That said, a Silego GPAK device gets pretty close, at about 0.75mm.

You didn’t mention your battery - how are you dealing with that?

More: have a look here. Some candidates that meet your criteria possibly. What are the smallest microcontrollers?

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