5A Adjustable CC/CV Display Step Down charge Module LED Panel Voltmeter Ammeter

5A Adjustable CC/CV Display Step Down charge Module LED Panel Voltmeter Ammeter

Description:      Specification:             Universal receiver.         100% Brand New         Module Properties: non-isolated constant current and voltage module         Rectification: non-synchronous rectification         Input voltage: 5V-32V         Output voltage: 0.8V-30V         Output current: adjustable maximum 5A         Conversion efficiency: 95% (the highest)         Switching frequency: 300KHz         Output ripple: 50mV (max) 20M bandwidth         Load Regulation: ± 0.5%         Voltage Regulation: ± 2.5%         Operating Temperature: -40℃to +85℃         Size: 51 * 26.3 * 14 (L * W * H) (mm)            Voltmeter Ammeter             Measurement accuracy: 0.1%         Refresh rate: about 200ms / times\         Display: 0.28"digital tube         Current Range 0A-5A         Voltage range 5V-30V         Display Color Red           Package Included:                       100% Brand New                           DC 5A 0.8V-30V Constant Current/Voltage LED Driver Step-Down Power Module  x 1

DC 5V to 3.3V Buck Module & Base Resistor Logic level converter for Arduino

Description: 

 

1 On board DC 5V to 3.3V DC-DC Step-Down Power Supply Buck Module,IC AMS1117-3.3;

2 On board 8 channels 5V to 3.3V(also 3.3V to 5V) Logic level converter,base Limiting resistor ;

3  Arduino Breadboard friendly;

4 PCB size:25* 15mm 

 

Level conversion principle:

Between 5V and 3.3V level plus 470 ohm current limiting resistor, to avoid being burned of 3.3V port.

So, when the LOW side no-load, HIGH side plus 5V level,LOW side test is still at 5V level，vice versa.

This is a normal phenomenon, not the level conversion function does not work.