[i=s]This post was last edited by ddllxxrr on 2019-5-25 06:17[/i] Because, for this competition, I used the idea of experimenting first and then drawing by myself. This almost failed because I did not...
I have a few power supplies, the kind that are a black tube with a wire, one is marked 9V, the other is marked 10V, why are the output voltages all 13V and 14V? Take them apart and you will see that t...
What can I use to realize the on-off control of DC 120V, 75A? Because the power-on time is not long, the relay has found a model, but there is no suitable switch. Can I use an air switch? Is there a s...
Maybe making PCB, purchasing components and soldering in the first version was too troublesome for many netizens, so I revised it and made the second version. It only needs LED lights, ESP32 developme...
The market of electronic information sector has been particularly eye-catching recently, but the market of electronic information sector has just started. From the perspective of international market,...