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Build NE555 with pure chip components

 
Overview

Inspired by a big boss, his discrete device 555-> https://oshwhub.com/dz_DIY_mingming/fen-li-yuan-jian-da-jian-555ding , I want to try using SMD components to reduce the PCB area. It has no practical use, just feelings (actually, it hurts to be idle)

Without further ado, here are the renderings↓ IMG_20200423_214254.jpgIMG_20200423_214347.jpg

In terms of area, it feels like it could be reduced by a hundred million points. Take a CPU for comparison: IMG_20200423_214632.jpg

Next comes the exciting power-on test session. Use two 10K resistors and a 10uf capacitor to build a multivibrator circuit, connect it to 12V, and calculate the output to be about 3.33Hz. Connect the fan, and a scent of aroma will come out. ↓ IMG_20200423_200314.jpg That’s right! It's red! The triode used in the 3-pin output stage is S8050, with a rated current of 0.5A. . . . .

Replaced a new transistor with a voltage of 5V, and connected only one LED load. It worked normally this time. Due to limited conditions, I could only use a toy oscilloscope to check the waveform. The effect can be seen in the video.

IMG_20200423_210611.jpg

Change the capacitor to 100nf, and the output waveform of pin 3 is:

IMG_20200423_215225.jpg

Change the capacitor to 10nf (the oscilloscope is not very accurate), and the output waveform of pin 3 is:

IMG_20200423_215058.jpg You’ve seen this, why don’t you leave without giving me a thumbs up? (๑•ᴗ•๑)

参考设计图片
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