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Most of the input voltage Z is lower than 8V. And our power supply uses DU Li''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s power supply to support Z low voltage 4V. I think you have a wider scope of work. Value for money.(Voltage regulation resistance is 47K, current regulation is 4.7K)Module name: 12A step-down constant voltage and constant currentModule nature: non-isolated step-down module(BUCK)Output voltage: 1-30V continuously adjustable,(The default output voltage is adjusted to 5V for shipment. If you need the store to adjust to its computer voltage for shipment, please leave a message). )Cabinet description)Working temperature: -40~+85 degreesWorking frequency: 380KHzConversion efficiency: 97% higher than Z(Efficiency is related to input, output voltage, current, and pressure difference)Short circuit protection: Yes(The protection short-circuit current point is adjustable, which can be short-circuited for a long time)Over temperature protection: Yes(Automatically shut down the output after over temperature)Input reverse connection protection: YesInstallation method: 4 3mm screwsWiring mode: terminal block(When equipped with a shell, it is a welding wire output)V-IN is input, V-OUT is outputModule size: length 70mm width 52mm height 50mBuyers note: This power supply has a constant voltage and constant current short-circuit protection function. The LED can be driven in constant current mode, and the battery can be charged, but there is no full indicator when charging the battery. In order to meet the needs of more Taoyou friends, our store has developed a high-efficiency constant voltage and constant current power module with charging instructions.The current detection of the module is low-end detection, please do not short-circuit the negative pole of the input and the negative pole of the output directly with a wire!The module is a step-down power supply that can only step down but not up. The input voltage must be higher than the output voltage.Voltage/current/overcurrent protection point/adjustment method:Constant voltage adjustment: Turn the "constant voltage adjustment" potentiometer on the power board according to the voltage you need. Clockwise(Turn right)The voltage is lowered. Counterclockwise(Turn left)The voltage rises.Constant current adjustment: before setting the current, adjust the "overcurrent adjustment" potential to the left to Z,(He thinks Z is big. Generally do not need to be adjusted)Use a multimeter to short-circuit the output in the 20A current range, adjust the "constant current adjustment" potentiometer to the current you need, turn the current clockwise down, and turn up the counterclockwise current.Over-current regulation: Designed for output short-circuit, which means that when the output short-circuit exceeds the set short-circuit current, the power supply shuts off the output to protect the power supply module and electrical equipment from damage. Adjustment method: first set the current of the protection point, if it is 5A protection. Use the constant current adjustment method to adjust the output current to 5A, and then adjust the "overcurrent adjustment" potentiometer(Clockwise)Just switch to the output without current. Sometimes the overcurrent point is 5A.(Note that if the current of the protection point is lower than the current required by the device, the power supply will be protected. It is recommended that if the over-current protection is not needed, keep the default value.)Application range:1. DIY a regulated power supply with constant current function, which is not afraid of short circuit during use, which can protect the load.2. Power your electronic equipment.3. Charge various batteries, set the charging voltage and charging current according to the batteries of different voltages and capacities. 4. Use solar panels to supply power to charge various batteries, with constant current function to prevent battery overcharging and effective protection Battery.5. Drive high-power LEDs, which can be freely combined in series and parallel,6. As the vehicle power supply, power your mobile phone or various digital products.https://gw.alicdn.com/tfs/TB1OX7HyxTpK1RjSZFKXXa2wXXa-1125-231.png