Relay + capacitor = T flip-flop, cascaded to form the NE555 clock of the asynchronous counter

Introduction: This project uses 8 relays and a capacitor to form a T flip-flop, which is then cascaded to form an asynchronous counter, and matched with a clock composed of NE555. Turn on the power and start clicking~

Schematic PCB

Geiger counter ILI9341TFT touch screen version

Introduction: A Geiger counter is an instrument used to detect and measure ionizing radiation. It is one of the most famous radiation detection instruments in the world because it can be used to detect ionizing radiation such as alpha particles, beta particles, and gamma rays, and is commonly used as a handheld radiation survey instrument.

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Simple digital frequency meter circuit design

Introduction: Digital electronics course design_frequency meter is built using discrete components and does not contain MCU and other components that require code. Measuring range: 1HZ-9999KHZ

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EDP-DP 40Pin

Introduction: https://b23.tv/TXN9vO

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555 button sounder

Introduction: 555 Sounder

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Mouse point modification parts,

Introduction: The main principle is to use NE555 to generate a square wave signal with an adjustable frequency duty cycle of 50%. The square wave signal controls the S8050 switch analog hand point.

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decimal counter

Introduction: Pure hardware circuit, no programming

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business card tool card

Introduction: Business card tool card, with standards, commonly used packaging information or patch practice version.

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Schumann wave generator

Introduction: Schumann Wave Generator

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NE555 relay delay conduction module

Introduction: Based on the NE555 timer IC delay conduction relay module, adjust the resistance size to delay the relay closing time

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555 speed regulator

Introduction: PWM speed regulator

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[Summer Must-Have] Handheld Violent Fan

Introduction: A violent fan powered by lithium batteries, enjoy the coolness like a storm in the summer!

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[Problem] Ultrasonic directional speaker

Introduction: Ultrasonic speaker driver board using 555 timer and high-power triode tube

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sstc arc extinguishing plate

Introduction: sstc arc extinguishing plate

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Simple DC motor driver board

Introduction: Use NE555 to design a pulse oscillator with adjustable duty cycle. By adjusting the output square wave pulse to control the MOS tube, the greater the duty cycle of the pulse (the longer the conduction time), the greater the drive current of the motor and the faster the speed; conversely, the smaller the drive current of the motor and the slower the speed. .　

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【Digital Electronics Course Design】Electronic Game Turntable

Introduction: The electronic turntable game circuit implements the following functions: press the button in the middle, and the 16 LED lights on the outer ring will light up and rotate one after another at a faster speed. When the button is released, it will slowly slow down and finally stop randomly at a certain point. One light spot no longer rotates.

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NE555 dimming speed

Introduction: Simple NE555 duty cycle dimming, changing the R1 R2 C1 potentiometer resistance can change the frequency.

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555DC dimming

Introduction: The dimmers on the market have a certain stroboscopic phenomenon and are very uncomfortable to adjust, so I made a high-power DC dimmer.

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【Course Design】Touch Sensor

Introduction: Make a delay-off switch to transform the desk lamp. When the lights are turned off at night in school life, turn on the delay-off switch of the desk lamp. When you climb up the ladder and go to bed, the desk lamp will automatically turn off.

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Guitar water lamp

Introduction: Hebei University Science and Technology Innovation Association, EDA training first course introduction: I participated in the club’s activities for the first time and made a pure circuit-implemented LED running light, which is quite good-looking.

Schematic PCB