[PCB] Eye of God

A triangular wave signal generator is composed of LM358 and peripheral circuits; the triode forms a common collector circuit, which amplifies the triangular wave signal applied to the base, and because the voltage of the base is a triangular wave sandwiched on the DC signal, causing the emitter to The output voltage is an upward-moving triangle wave signal, which can control the brightness of the LED light to create a breathing effect.
[1] The scheme has not been verified
[2] Problems: 1. The existing packaging of some components is wrong and needs to be re-purchased.
                    2. Using existing components and debugging with flying wires, the LED light starts very bright, then dims immediately, and then remains normal. Bright. Shorting the capacitor will make it brighter, and releasing it will make it darker.
[3] The components were correctly packaged and welded. The courier arrived and the welding was completed. There are two problems.
          1. The TypeC interface is too far inside and the data cable cannot be connected. The pcb needs to be moved downwards. For now, lift the following pins for debugging.
          2. The R4 resistor 100k was soldered incorrectly. It may be that the components were confused when welding them together. Welded a 22Ω resistor. After looking at the silk screen, I realized something was wrong. Breathing is normal after 100k welding, and the frequency can be controlled by adjusting the potentiometer.
【4】
See the video for the final effect
. 【5】TypeC position adjustment of PCB.