0-18V CNC DC adjustable regulated power supply diy kit

The DC adjustable regulated power supply diy kit is easy to install and easy to adjust. After correct welding according to the PCB mark, the common voltage can be stored for the next call. The LCD screen can display the voltage and current (due to the small error in the AD of the single-chip microcomputer, it needs to be adjusted several times at high voltage and low voltage to minimize the error, generally it can be controlled within 0.3V, and those who require very precise do not shoot), The circuit has short-circuit protection and over-current alarm. Kit parameters: Product name: 0~18V digital display adjustable DC regulated power supply Product model: JS-56-323 Input voltage: 220V AC (double 18V transformer) Output voltage: 0-18V (adjustable) Output current: 1A (adjustable) Output power: 20W PCB circuit board size: 111*73mm Acrylic shell size: 128*88*31mm   Features: 1: Single-chip microcomputer control, button to adjust the voltage, step ± 0.1V 2: Commonly used voltages can be stored for the convenience of next call 3: The LCD screen displays the voltage and current 4: Circuit short circuit protection, overcurrent alarm 5: 4700UF large capacitor filter Instructions: (1) After welding the finished product, plug in the power supply, LED1 flashes, and the voltage regulator circuit is normal. (2) Press the KEY1 button, the red light of LED2 will be on, and the buzzer will sound. After a few seconds, the red light will be off, and the buzzer will stop. (3) The system is initialized successfully, adjust the resistor R3 to make the LCD display normal, the first line displays the voltage, and the second line displays the current. (4) Adjust the resistance of R4, measure the voltage of the REF test ring with a voltmeter, so that the voltage is close to “2.04” V, the closer to this voltage, the more accurate the output voltage; Note: During this process, the heat sink on the TIP122 needs to be turned Remove it, because the heat sink is connected to 20V voltage, avoid accidental contact, causing the REF voltage to be too large, which will burn out the TLC5615 chip. (5) After debugging, press the “ ” button to increase the output voltage. Each time you press the button, the OUT voltage increases by 0.1V, and the LCD screen will display the voltage at this time; press the “-” button, OUT decreases the output voltage , each press, the voltage decreases by 0.1V; the current will be displayed only when the load is connected. (6) Press the “OK” button, LED2 flashes, indicating that the voltage is stored successfully at this time, and a maximum of 10 common voltages can be stored for the next use. (7) Press the “CHOOSE” button to view the stored voltage, then press the “OK” button to output the previously stored voltage value to the voltage port. Note: When using for the first time, there is no stored voltage, and garbled characters will be displayed at this time, please be sure to store the voltage yourself before using this function. (8) Press the “RESET” button to reset the system. However, the previously stored voltage values will not be lost. (9) When the system detects that the output current exceeds 1A, LED2 will emit red light and the buzzer will sound, and the system will automatically reduce the voltage until the current drops below 1A. (10) When the use time is too long or the current output is large during use, etc., the heat sink is overheated, the power should be cut off and the use should be suspended, so as not to affect the service life of the chip or damage the chip. (11) When not in use, be sure to turn off the power (uninterrupted power consumption will continue to consume power, the voltage regulator chip will continue to work and continue to generate heat), unplug the plug first, and wait for the power stored in the capacitor to be released before pressing Button disconnect switch.