Scrap from old toy, what is this changes LEDs and brightness VIDEO

Other Hardware General Electronics
1

Hi,

I scrapped an old toy and gathered this. Supplied 3.7v via cap, with 47 ohm resistor.

Question is; how to make this effect? In that black dot is there a microcontroller(don't think so) ? What are the ways to do this considering black dot is very small?

[https://youtube.com/shorts/HQZlgwn4h64?si=tZldRUiLxylNoR4-](https://Video of led circuit)

2

Yes, there is some kind of controller in that black dot.

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3

Most likely a microcontroller, could be a custom ASIC.

You can get some very small MCUs, https://www.zdnet.com/article/tis-tiny-microcontroller-is-the-worlds-smallest-and-costs-20-cents/

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4

It is called Chip On Board (COB). The bare chip is mounted directly on the board and then covered with a glob of epoxy. It is used with (relatively) simple chips in high volume applications. It save cost by not packaging the chip.

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