Small size charge and discharge management module based on SY3501D

Introduction: Small size charge and discharge management module based on SY3501D

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arbitrary waveform generator

This is a generator that can produce square waves, triangle waves, and sine waves

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Practical Audio Amplifier

Practical Audio Amplifier

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Multi-waveform generator made using LMV324 and 74HC74D

Introduction: This is a multi-waveform generator made using LMV324 and 74HC74D. It can output high-frequency and low-frequency square waves, triangle waves, and sine waves.

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LM3886 dual channel dual power supply

Introduction: A high-performance power amplifier IC from National Semiconductor

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The most beggar 17-key + touch strip mechanical keyboard

Introduction: After one year, the sequel to the most beggar mechanical keyboard: the most beggar small keyboard, makes full use of the touch key peripherals that come with the CH551G, combines my previous open source touch slip ring DEMO, and uses the touch bar for multimedia control ( And the touch strip does not require additional components, so you can definitely afford the cost of DIY)

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LM2596 buck-boost circuit (with simulation diagram)

Introduction: LM2596 is commonly used as a step-down device. Have you ever heard of it used as a step-down device? (Not the negative voltage output kind) The test chip is lm2596 and a pin-compatible chip. Here we choose AP1501 (material number: C360640) for testing.

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"Simple" RGB light gradient using 555 chip

Introduction: The design uses 4 NE555s, 3 of which generate triangular wave signals that are output in sequence, and drive the LED with constant current through the transistor to make it gradually change. The other channel generates a PWM signal to control the LED brightness.

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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~

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【DEMO】CH551G Touch Ring

Introduction: Try to make a touch slider demo on a low-end microcontroller with touch capacitance detection

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CNC DC power supply

CNC DC power supply

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51 microcontroller radio frequency RFID card

Introduction: This circuit can be used with the RFID-RC522 module for access control. The program is in the attachment and can be used after downloading.

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Third generation mini model aircraft remote control receiver

Introduction: The new version of the receiver has very powerful functions, upgraded remote control, and a new design of the third-generation receiver. In addition to outputting servo signals, it can also output high-level signals and PWM signals to directly drive peripherals. PPM output, serial port output, can play simulator, connect flight control, etc. Voltage return, signal quality return.

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nrf52832 minimum system development board Bluetooth mechanical keyboard development board

Introduction: A minimal system development version based on nrf52832, which can be used to develop Bluetooth keyboards, etc.

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Mini model aircraft remote control third generation

Introduction: Mini model aircraft remote control, just to make more people play model aircraft.

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Model aircraft remote control third generation

Introduction: The third-generation remote control has been destined to be an epic work in the DIY field from the time of design. The third-generation remote control integrates 2.4G, 433M, and infrared remote control into one. One control takes all in this series. All receivers can control a variety of toy quadcopters and aircraft on the market.

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Standard GH60 mechanical keyboard 14 RGB backlight blue axis lights

Introduction: GH60 standard version configuration, ATMEGA32U4 main control, QMK solution, all keys support custom programming, and equipped with 14 RGB backlights and 60 axis lights, so that your keyboard is fully loaded with special effects.

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12-channel mini model aircraft remote control third generation

Introduction: The 12-channel model aircraft remote control has developed more channels and can use more external devices. At the same time, this version is smaller in size and is truly mini.

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Nixie tube watch based on STC51 microcontroller

Introduction: 2 Niwa tubes. When you raise your wrist, the hours will be displayed first, and then the minutes will be displayed. The Niwa tubes consume a lot of power, so the NIWA watch cannot stay on. It has a built-in gyroscope sensor, so you can only see the time by raising your wrist. The watch will light up when the time is up, which is the same as current smart watches.

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Based on LM324 passive electronic load

Introduction: A small passive DC adjustable constant current (CC) electronic load, used to test constant voltage DC power supplies.

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