YH-729 adjustable DC regulated power supply DIY kit

The YH-729 is a DIY kit for an adjustable DC regulated power supply designed for electronics enthusiasts and student experiments. It connects directly to AC 220V mains power and features multiple fixed voltage outputs alongside one continuously adjustable voltage output. Housed in a transparent acrylic case, the assembled unit serves as a compact desktop power supply suitable for electronics DIY projects, circuit debugging, and educational experiments.

Key specifications:

Model: YH-729
Input power: AC 220V
Dimensions: 106 x 85 x 43 mm
Max total power: 24W (DK124 offline switching power supply controller)
Output specifications (24V-1A version):
· Adjustable voltage output: Uses the 2596-ADJ chip for continuous voltage adjustment; features a built-in 1.23V reference, 150kHz switching frequency, and built-in current limiting and thermal shutdown protection.
· Fixed 5V output: 2596-5.0 voltage regulator IC.
· Fixed 3.3V output: ASM1117-3.3 linear voltage regulator IC.
Kit contents: PCB and all electronic components, transparent acrylic case, digital voltage display, and voltage adjustment potentiometer.

Core chip principles:

1. DK124: Offline switching power supply controller chip. It steps down the high-voltage AC 220V input to provide a primary DC power supply with a total output of 24W, serving as the core of the high-voltage input stage.
2. LM2596 series step-down chip: A buck-type switching power supply management chip featuring a built-in 150kHz fixed oscillator and 1.23V reference voltage source. It includes current limiting and thermal shutdown protection, requires few peripheral components, and offers high conversion efficiency. · 2596ADJ: Adjustable version; the output voltage can be continuously adjusted via a rotary potentiometer, with a digital display showing the voltage in real-time.
· 2596-5.0: Fixed 5V regulated output; supplies power to microcontrollers and digital circuits.
3. ASM1117-3.3: Low-dropout (LDO) linear voltage regulator chip providing a stable 3.3V output; suitable for powering various 3.3V logic chips and sensors.

Product features:

1. 5-channel voltage output: Adjustable voltage + 3.3V + 5V, meeting the needs of most electronic experiments.
2. Transparent acrylic housing: Allows for clear visibility of circuit board components after assembly, making it ideal for educational purposes.
3. Built-in digital voltage display: Enables real-time monitoring of the adjustable output voltage for intuitive adjustment.
4. Multiple protections: Chips feature built-in over-current and over-temperature protection; automatic cutoff during short circuits reduces the risk of damaging components during experiments.
5. DIY kit format: Requires soldering and assembly, helping to develop soldering skills and providing insight into the principles of switching power supplies and voltage regulation circuits.

Applications:

DIY projects for electronics enthusiasts, electronics training in colleges and technical schools, microcontroller experiments, small-scale circuit debugging, power supply for models or small modules, and use as a simple laboratory DC power supply.

Precautions:
1. The kit operates on 220V high-voltage AC; take precautions against electric shock during testing after soldering, and ensure the housing is fully assembled before connecting the power.
2. Maximum total power is 24W; when using multiple outputs simultaneously, the total load power must not exceed the rated power.
3. This product is a DIY kit requiring basic soldering skills; tools (soldering iron, solder) must be provided by the user.