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Author Topic: How it blinks?  (Read 646 times)

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Offline t4rmoTopic starter

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How it blinks?
« on: December 12, 2022, 06:53:41 pm »
Recently, i have bought Christmas lights, I don't understand how they blink without capacitor, any idea?
I attach the circuit
« Last Edit: December 12, 2022, 06:56:18 pm by t4rmo »
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Offline ealex

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Re: How it blinks?
« Reply #1 on: December 12, 2022, 07:10:26 pm »
hello

just a guess: there is a small capacitor in the 3 pins component.
it forms a high frequency oscillator that's divided down to the blink rate.

here's an analysis of "flame flicker" led: https://cpldcpu.wordpress.com/2014/03/01/follow-up-on-candle-flicker-leds/
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Online Zero999

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Re: How it blinks?
« Reply #2 on: December 12, 2022, 08:55:28 pm »
The part labelled 706 is an LED flasher IC. There are LEDs available, with it built-in.
https://www.eevblog.com/forum/projects/optoelectronics-die-pictures/msg3248254/#msg3248254

Here's an example of such an IC, in a through hole package.
https://www.rapidonline.com/Catalogue/Product?Id=82-0030
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