011 Electronic Butterfly - Breathing Light

Reference Project:
Butterfly Goddess - JLCPCB EDA Open Source Hardware Platform (oshwhub.com).
 

The original project used an MCU for implementation. This solution has been modified to use an operational amplifier chip to generate a PWM wave effect.
Color technology was not used; those who need it can refer to the original project and add it themselves.
The wing part has a cutout area added directly to the PCB. You can carefully polish it with a file to make the texture finer.

 
 
Principle:
As shown in the figure below, a triangular wave generator circuit is built using a dual-channel operational amplifier LM358 chip to generate an output signal, which is connected to the base of a transistor. After amplification, it drives the LED load to achieve the breathing effect.
Soldering and Assembly:
The circuit board needs to be separated and polished with a file. The welding angle of the wings needs to be adjusted according to the actual situation.
 
Currently, the four wings are welded to the same type of LED. Different colored LEDs have different voltage drops, so separate circuits need to be added and the appropriate resistance values ​​adjusted; otherwise, the brightness will be uneven.