The principle of the metal detector is very simple. A pulse signal generator is built using NE555 to generate a high-frequency pulse signal, which is provided to the induction coil, and a magnetic field is generated on the coil.
Once you know the principle, it will be very simple to do. Then prepare two potentiometers, one 2k to adjust the coil frequency, which is the detection distance.
There is also a 100k one for adjusting the sensitivity. Li Xin connected these things bit by bit, and then he just needed to experiment and adjust the small details.
It didn't take long for Li Xin to make this small metal detector. He hid a piece of metal in the cabinet and scanned it with the detector. After a while, a sound was indeed heard.
Li Xin made it very small so that it could be held in one hand. After the test, Li Xin made the surface more refined and left the space with it in his hand.
Seeing that it was getting late, Li Xin put away the detector he had just made and put Sanmao back into the space.
The tea was still on the table. Sanmao had heated it up, and even now, it was still hot.
Li Xin took a few sips, put away the tea set, and was about to wash the vegetables and cook when she suddenly remembered that He Beichen's sheets and quilt covers were still drying in the yard.
…
He Beichen came back from the army and saw a familiar figure as soon as he walked into the compound. He turned around and walked over.
This bed sheet?
If he remembered correctly, it should be on his bed.
"You haven't slept in it for a few days, why are you washing it already?" He Beichen reached out and took the sheet from Li Xin's hand.
Li Xin was startled by his sudden appearance and loosened her hands that were holding the sheets. If He Beichen had not caught them, they might have fallen to the ground.
"You're back... I was thinking of washing and changing the sheets more often, and the sun is nice today." Li Xin explained after seeing He Beichen take the sheets and quilt covers.
Although she just walked into his room in a daze and took the sheets apart to wash them, she still remembered that in her previous life, she often saw people complaining online that the colors of their husbands' sheets faded while they slept, and the side of the sheets where her husband slept turned yellow.
Li Xin felt that it was definitely a good idea to wash more frequently!
"Yeah." He Beichen didn't care. He thought that the house was always clean after Li Xin came here, and he still recognized his young wife's ability to manage the household from the bottom of his heart.
Except cooking.
The two returned home, and Li Xin took the bed sheet from He Beichen and prepared to put it on him again.
He Beichen didn't go into the kitchen. He followed Li Xin in and watched her put on the bed.
Li Xin seemed to be in a good mood, but as he watched, he felt inexplicably unhappy.
"Li Xin." He Beichen walked forward and called her in a low voice.
"Ah...what's wrong?" Li Xin looked at him puzzledly, wondering why He Beichen didn't go to the kitchen to cook, but followed her in instead. "Please spread the mat over there."
Li Xin didn't wait for his answer and picked up a corner of the bed sheet and handed it to him.
"That's perfect, we can each take one side." If we pull together, she won't have to run around.
"..." He Beichen was holding a corner of the bed sheet in his hand, but after Li Xin walked to the bed, he still stood there without moving.
"He Beichen, what are you doing?" Li Xin pulled at the object but failed to budge. He looked at He Beichen in confusion, "Help me!"
"This bed is too hard. It's uncomfortable to sleep on just the bed board." He Beichen paused and looked at the bed with some disgust.
The bed has not been made yet, there is only a hard bed board. The more He Beichen looks at it, the more he dislikes it.
It’s exactly the same as the single bed in his dormitory.
"?" Li Xin looked at the bed in front of him in a daze after hearing that.
She had only taken off the sheets and quilt cover before, and didn't care that there was only a hard bed board on it, without even a thin mattress.
That’s right. He Beichen has been sleeping for such a long time without any cushion. So how did he sleep before?
"Sorry, sorry. I'll go get a quilt to put on you." Li Xin let go of the bed sheet in his hand and prepared to go back to the room to get a quilt.
Li Xin remembered that there were two quilts in the cabinet in her room. If she moved a thicker one over, it wouldn't feel so hard after she put it on.
I don’t know if He Beichen likes to sleep on soft beds. If he wants something softer, he can move both beds over.
If that's still not enough, then she will take out the cotton wool from the Li family that she moved into the space!
“…”
Seeing that she was really going to move the cotton wool, He Beichen gritted his teeth and grabbed Li Xin when he passed by him.
"What's wrong? Do you want to move it yourself?" Li Xin asked.
"What I mean is... I don't want to sleep in this bed anymore." He Beichen looked into Li Xin's eyes and said directly.
Last night, after sending Li Xin back to the room, He Beichen reflected and introspected.
They are now husband and wife.
Why should a couple sleep in separate rooms?
But he was the one who brought up this matter before, and he hadn't figured out how to talk to Li Xin about sleeping in the same bed again.
But Li Xin washed his sheets and quilt covers at this time, and He Beichen suddenly felt that this was a good opportunity.
Oh~
Li Xin finally understood. He said the bed was too hard. He hadn't slept with her for so long before. So he wanted to move in and sleep with her?
A scheming man!
"If you don't want to sleep here, you can sleep on the sofa. Or I can make a bed for you on the floor in the living room?" Li Xin looked at him with a smile.
Before, when He Beichen said they wanted to sleep in separate rooms, she ran over and told him to go back to sleep but he refused to go. Oh, now she suddenly got it again?
“…”
He Beichen looked into Li Xin's eyes with burning eyes, and he could see clearly the emotions that Li Xin did not hide.
He suddenly threw away the bed sheet in his hand, and his eyes were suddenly full of aggression like a wolf seeing its prey.
“Eh…?”
The next second, Li Xin, who was about to retreat, suddenly flew into the air, and she was so scared that she hugged He Beichen's neck.
He Beichen suddenly picked her up and carried her sideways, walking out of the room.
"He Beichen, what are you doing? The bed hasn't been made yet!" Li Xin kicked her legs, trying to get He Beichen to put her down.
But He Beichen acted as if he didn't hear anything. He carried her and quickly went to the next room and put Li Xin on the bed in the master bedroom.
He did not stand up, but supported himself with his hands on both sides, circled Li Xin in the middle, and kept his eyes on Li Xin's eyes.
"I want to sleep here." He Beichen's voice was low, strong and domineering.
In this position, Li Xin felt the burning breath from He Beichen, and three words suddenly emerged in her mind: forced love.
Li Xin's face turned completely red.
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